WO1997047586A1 - Process for the preparation of aromatic carbonic ester - Google Patents
Process for the preparation of aromatic carbonic ester Download PDFInfo
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- WO1997047586A1 WO1997047586A1 PCT/JP1997/002000 JP9702000W WO9747586A1 WO 1997047586 A1 WO1997047586 A1 WO 1997047586A1 JP 9702000 W JP9702000 W JP 9702000W WO 9747586 A1 WO9747586 A1 WO 9747586A1
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- carbonate
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- aliphatic
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C68/00—Preparation of esters of carbonic or haloformic acids
- C07C68/06—Preparation of esters of carbonic or haloformic acids from organic carbonates
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Definitions
- the present invention also relates to a method for producing an aromatic carbonate ester in which a transesterification reaction between an aromatic carboxylic acid ester and an aliphatic carbonate and / or an aromatic-aliphatic carbonate is performed using a multistage reactive distillation apparatus. It is.
- Aromatic carbonates are industrially useful compounds. Background art
- a method for producing an aromatic carbonate for example, a method of subjecting an aliphatic carbonate to an ester exchange reaction between an aromatic hydroxy compound or an aromatic carboxylic acid ester is known.
- diphenyl carbonate which is a kind of aromatic carbonate.
- US Pat. No. 4,533,504 discloses aliphatic carbonate.
- Japanese Patent Application Laid-Open No. 3-291257 discloses a continuous multi-stage distillation column (reactive distillation apparatus) in which dimethyl carbonate and one of aromatic hydroxy compounds are used. There is disclosed a method of producing methyl phenyl carbonate by reacting with a certain phenol, and then disproportionating the methyl phenyl carbonate to obtain diphenyl carbonate as a target. -However, the method disclosed in U.S. Pat. No. 4,533,504 has a high conversion of dimethyl carbonate as high as 70 mol% or more, but the method is batch type, so that the productivity is low. And it is not possible to efficiently produce diphenyl carbonate.
- the method disclosed in Japanese Patent Application Laid-Open No. 3-291257 has a drawback that the conversion of dimethyl carbonate is about 1.6 to 24 mol% and the productivity is low. Have. Further, in this method, since diphenyl carbonate is obtained by disproportionating methylphenyl carbonate, there are many steps until the diphenyl carbonate is obtained, so that diphenyl carbonate cannot be efficiently produced. Have.
- the present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a production method capable of continuously and efficiently producing an aromatic carbonate. Disclosure of the invention
- the present inventors have diligently studied a method for producing an aromatic carbonate ester in order to solve the above-mentioned conventional problems.
- a transesterification reaction using a multistage reactive distillation apparatus
- an aliphatic carbonate having a boiling point lower than the boiling point of the reaction solution present in the second stage is provided in a second stage below the first stage.
- the aliphatic carbonate having a boiling point lower than the boiling point of the reaction solution present in the second stage is continuously supplied to the second stage below the first stage for supplying the raw materials.
- the present inventors have found that aromatic carbonates can be produced continuously and efficiently, and have completed the present invention.
- the method for producing an aromatic carbonate according to the present invention involves transesterification of an aromatic carboxylic acid ester with an aliphatic carbonate and / or an aromatic aliphatic carbonate.
- a method for producing an aromatic carbonate to be reacted wherein a multi-stage reactive distillation apparatus having a first stage and a second stage below the first stage is used.
- a raw material containing a rubonic ester and the aliphatic carbonate and the Z or aromatic-aliphatic carbonate is continuously supplied to the first stage, while the second stage is supplied with the second It is characterized by the continuous supply of aliphatic carbonate having a boiling point lower than the boiling point of the reaction solution present in the stage.
- an aliphatic having a boiling point lower than the boiling point of the reaction liquid flowing down to the second stage is provided in the second stage below the first stage for continuously supplying the raw materials.
- the carbonate By continuously supplying the carbonate, at least a part of the aliphatic carbonate having a low boiling point becomes gaseous in the second stage, and the boiling point is lowered.
- the multistage -The operating pressure in the column of the reactive distillation apparatus can be increased, and the boiling point at the top of the reactive distillation apparatus rises, and the reaction temperature in that section can be maintained high. Therefore, the overall reaction rate of the multi-stage reactive distillation apparatus is improved, and the efficiency of aromatic carbonate production in the reactive distillation apparatus can be improved.
- the aliphatic carbonate having a boiling point lower than the boiling point of the reaction solution present in the second stage is continuously supplied to the second stage below the first stage. This makes it possible to continuously and efficiently produce an aromatic carbonate in a multistage reactive distillation apparatus.
- the second stage is a bottom of a reactive distillation apparatus.
- the ratio of the supply amount of the aliphatic carbonate to be supplied to the second stage to the supply amount of the raw material is in the range of 0.001 to 5 times by weight. Is desirable.
- an aromatic carbonate can be produced continuously and more efficiently.
- FIG. 1 is a block diagram showing a schematic configuration of a reactive distillation apparatus suitable for a production method according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view of a main part showing a schematic configuration of a packed tower included in a reactive distillation apparatus according to one embodiment of the present invention.
- the “boiling point of the reaction solution” indicates the boiling point of a mixed solution comprising a plurality of components, which constitutes the reaction solution.
- the “bottom portion” means the bottom of the reactive distillation apparatus and the “(1-5) n” th stage from the bottom when the total number of the reactive distillation apparatus is n. Is shown.
- the aliphatic carbonate refers to a carbonate having two aliphatic groups as substituents
- the aromatic / aliphatic carbonate refers to an aliphatic group and an aromatic group as substituents
- aromatic carbonate refers to a carbonate ester having two aromatic groups as substituents.
- the method for producing an aromatic carbonate according to the present invention comprises transesterifying an aromatic carboxylate with an aliphatic carbonate and Z or an aromatic / aliphatic carbonate using a multistage reactive distillation apparatus.
- a method for producing an aromatic carbonate ester to be reacted comprising: a raw material containing the aromatic carboxylic acid ester and the aliphatic carbonate ester and / or an aromatic aliphatic carbonate ester (hereinafter, simply referred to as a raw material). Is continuously supplied to the first stage of the reactive distillation apparatus, while the second stage below the first stage has a boiling point higher than the boiling point of the reaction solution present in the second stage. This is a method for continuously supplying aliphatic carbonates with low carbon content.
- aliphatic carbonate (a) when it is necessary to distinguish between the aliphatic carbonate contained in the raw material and the aliphatic carbonate supplied to the second stage, the aliphatic carbonate supplied to the second stage is used. It is referred to as aliphatic carbonate (a).
- aromatic carboxylate examples include, for example, phenyl acetate, each isomer of methyl phenyl acetate, and each isomer of ethyl phenyl acetate -Isomers, chlorophenyl acetate isomers, isopiryl acetate ⁇ -pirphenyl acetate isomers, methoxyphenyl acetate isomers, dimethylphenyl acetate isomers, naphthyl acetate isomers, propione Phenyl acid, methyl phenyl propionate isomers, phenyl butyrate, phenyl isobutyrate, phenol valerate, methyl valerate phenol isomers, phenyl isovalerate, hexane Examples thereof include phenyl acid, phenyl heptanoate and the like, but are not particularly limited.
- aliphatic carbonate examples include, for example, dimethyl carbonate, getyl carbonate, di-n-propyl carbonate, diisopropyl carbonate, dibutyl carbonate isomers, dipentyl carbonate isomers, and carbonic acid carbonate.
- These aliphatic carbonates may be used as a mixture as appropriate.
- dimethyl carbonate is preferred from an industrial viewpoint.
- the aliphatic carbonate (a) specifically includes, for example, the aliphatic carbonates exemplified above. Of the above exemplified compounds -Of these, dimethyl carbonate is preferred from the industrial point of view.
- Examples of the aromatic / aliphatic carbonate include a carbonate in which one of the two aliphatic groups of the aliphatic carbonate described above is replaced with an aromatic group.
- Specific examples of the aromatic group include the aromatic groups of the aromatic carboxylic esters described above. These aromatic / aliphatic carbonates may be used as a mixture as appropriate.
- the ratio of both is not particularly limited.
- an aromatic / aliphatic carbonic acid ester having a boiling point higher than the boiling point of the aliphatic carboxylic acid ester In order to continuously extract the generated aromatic carbonate out of the reaction system, it is necessary to prepare an aromatic carboxylic acid ester having a boiling point lower than that of the aromatic carbonate, an aliphatic carbonate ester, or an aromatic or aliphatic carbonate. The use of esters is preferred.
- the difference between the boiling points of the aromatic carbonate and the aromatic carboxylate is relatively large so that the aromatic carbonate and the aromatic carboxylate can be easily separated.
- the boiling point difference between the aromatic carboxylic acid ester and the aliphatic carboxylic acid ester is relatively large, that is, the boiling point difference between the above-mentioned raw materials is larger than each other. .
- the ratio is more preferably in the range of 1:20 to 20: 1, and more preferably in the range of 1:10 to 10: 1.
- the aliphatic carbonate used in calculating the above molar ratio includes the amount supplied as the aliphatic carbonate (a).
- the aromatic carboxylic acid ester may be mixed with a raw material for synthesizing the aromatic carboxylic acid ester, that is, an unreacted material.
- the unreacted product include an aliphatic carboxylic acid ester and an aromatic hydroxy compound.
- the content of the aromatic carboxylic acid ester in the mixture is 10 mol in order to efficiently produce the aromatic carbonate. % Or more is preferable, and 20 mol% or more is more preferable.
- the ratio of the supply amount of the aliphatic carbonate (a) to the supply amount of the raw material is preferably in the range of 0.001 to 5 times by weight, and more preferably in the range of 0.01 to 1 times by weight. Is more preferred.
- the supply amount of the aliphatic carbonate ester (a) is less than 0.001 weight times the supply amount of the raw material, the effect produced by the supply of the aliphatic carbonate ester (a) is reduced, which is preferable. Absent .
- the supply amount of the aliphatic carbonate (a) exceeds 5 times the supply amount of the raw material, the supply amount of the aliphatic carbonate (a) becomes too large, and the productivity decreases and the fat content decreases. It is not preferable because the utility cost for recovering the aromatic carbonate (a) increases.
- the above-mentioned transesterification reaction includes a reaction in which an aromatic / aliphatic carbonate is formed and an aromatic carbonate ester. The reaction proceeds in two stages with the reaction that produces
- the reactive distillation apparatus suitably used in the above-described production method includes a reactive distillation column 1, a reboiler 2, a condenser 3, a pump 4, a pressure regulating valve 11 and the like. I have.
- the reactive distillation column 1 has a structure in which a gas phase is present in the reactive distillation column 1 and the generated low-boiling components can be continuously separated and removed into the gas phase, ie, a so-called reaction Any structure can be used as long as distillation can be performed.
- a continuous multistage distillation column having two or more stages excluding the top and bottom is suitable.
- Such distillation columns include, for example, packed columns filled with packing materials such as Raschig ring, Paul ring, Interox saddle, Dickson packing, McMahon packing, and through-the-packing;
- a commonly used distillation column such as a tray column using a tray such as a tray, a sieve tray, or a valve tray can be used.
- a combined distillation column having both a tray and a packed bed can be employed.
- the above-mentioned number of plates indicates the number of plates in a tray column, and indicates the number of theoretical plates in a packed tower.
- the reactive distillation column 1 is a gas-liquid contact reactor in which an aromatic carboxylic acid ester is brought into gas-liquid contact with an aliphatic carbonate and / or an aromatic-aliphatic carbonate.
- a raw material supply pipe 5 and an aliphatic carbonate (a) supply pipe 6 are connected to the reactive distillation column 1.
- the bottom of the reactive distillation column 1 is connected to the reboiler 2 via an extraction pipe 8 and a conduit 14.
- the top of the reactive distillation column 1 is connected to a condenser 3 via a conduit 12.
- the aliphatic carbonate (a) supply pipe 6 is more preferably connected to the bottom of the tower, and even more preferably connected to the bottom of the tower.
- the first stage to which the raw material supply pipe 5 is connected is preferably near the middle stage of the reactive distillation column 1, but is not particularly limited.
- the raw material supply pipe 5 continuously supplies the raw material to the reactive distillation column 1.
- the aliphatic carbonate ( a ) supply pipe 6 continuously supplies the aliphatic carbonate (a) to the reactive distillation column 1.
- the aliphatic carbonate (a) supplied to the reactive distillation column 1 through the aliphatic carbonate (a) supply pipe 6 is a compound having a boiling point lower than the boiling point of the reaction solution present in the second stage.
- aliphatic carbonates contained in the raw materials are preferred.
- the use of the aliphatic carbonate contained in the raw material is industrially advantageous because the step of recovering the aliphatic carbonate (a) can be omitted as necessary.
- the reboiler 2 is connected to the bottom of the reactive distillation column 1 via an extraction pipe 8 and a conduit 14.
- the reboiler 2 heats the bottom liquid extracted through the extraction pipe 8 and returns the liquid to the bottom through the conduit 14.
- the reboiler 2 is set so that the temperature in the reactive distillation column 1 is gradually decreased from the bottom to the top by heating and circulating the bottom liquid.
- the withdrawal pipe 8 is branched so that part of the bottom liquid can be continuously withdrawn as a bottom liquid outside the reaction system.
- the condenser 3 condenses and liquefies the distillate from the reactive distillation column 1.
- the condenser 3 is connected to the top of the reactive distillation column 1 via a conduit 12, and connected to the pump 4 via a discharge pipe 9. Further, the condenser 3 is provided with an adjusting pipe 10 having a pressure adjusting valve 11. The extraction pipe 9 is branched so that a part of the distillate can be continuously extracted out of the reaction system.
- the pump 4 refluxes the distillate to the reactive distillation column 1 at a predetermined reflux ratio.
- the pump 4 is connected to the condenser 3 via an extraction pipe 9 and to the top of the reactive distillation column 1 via a conduit 13.
- the pressure regulating valve 11 normally adjusts the pressure inside the reaction distillation column 1 so as to increase the operating pressure. Thereby, the temperature of the reaction solution existing in the second stage in the state where the aliphatic carbonate (a) is supplied is set in the second stage in the state where the aliphatic carbonate (a) is not supplied. The temperature of the reaction solution can be maintained.
- the adjustment pipe 10 is connected to a pressure reducing device such as a vacuum pump or a pressure adjusting device such as a pressurizing device.
- the transesterification of the aromatic carboxylic acid ester with the aliphatic carbonate and / or the aromatic / aliphatic carbonate is carried out in the presence of a catalyst.
- the catalyst include: mineral acids such as sulfuric acid; sulfonic acids such as para-toluenesulfonic acid; solid acids such as ion-exchange resins and zeolite; bases such as sodium hydroxide; titanium tetraisopropoxide; Metal alkoxides such as zirconium (iV) isopropoxide; Lewis acids such as aluminum chloride and titanium tetrachloride; and compounds generating Lewis acids; Phenoxy lead and phenol -Metal phenoxides such as titanium; Lead oxides; Lead salts such as lead carbonate; Zirconium (IV) acetyl acetate, bis (acetyl acetate) copper (11), zinc (H) acetyl acetate Metal acetyl acetate complex such as lithium
- the catalyst When a homogeneous catalyst is used, the catalyst is mixed with an aromatic carboxylic acid ester and / or an aliphatic carbonate and / or an aromatic / aliphatic carbonate to perform reactive distillation. It is continuously supplied to column 1 or continuously supplied to reactive distillation column 1 separately from these raw materials.
- the catalyst and the raw material may be supplied to the same stage in the reactive distillation column 1, or may be supplied to different stages.
- the reactive distillation column 1 As the area (stage) where the catalyst is present is larger, the frequency of contact between the reaction solution and the catalyst is increased, and the reaction efficiency is improved. For this reason, it is preferable to supply the catalyst to the uppermost stage of the reactive distillation column 1 as much as possible.
- the catalyst may be separated and recovered from the bottom by using a known method such as distillation. Incidentally, the catalyst may be supplied to the reactive distillation column 1 in a state of being dissolved in an appropriate solvent.
- the lower limit of the catalyst concentration is 0.1 ppm with respect to the total amount of the aromatic carboxylic acid ester, the aliphatic carbonate, and the aromatic / aliphatic carbonate, that is, 0.1 ppm.
- the upper limit is the amount dissolved in the reaction solution inside the reactive distillation column 1 in a saturated state, and is approximately 10% by weight. -Or 5% by weight, more preferably 1% by weight.
- the catalyst When a solid heterogeneous catalyst is used, the catalyst may be held inside the reactive distillation column 1 and contacted with the reaction solution.
- a charging tower (to be described later) is used as the reactive distillation tower 1
- a heterogeneous catalyst can be charged instead of part or all of the packing charged in the reactive distillation tower 1.
- a tray column (described later) is used as the reactive distillation column 1
- the heterogeneous catalyst may be held in a plate or a downcomer.
- Factors that determine the operating conditions when operating the above reactive distillation column 1 include, for example, the number of stages, operating temperature (reaction temperature), operating pressure, liquid residence time, reflux ratio, and liquid hold-up amount. And the like.
- the operating temperature depends on the type and combination of the raw materials and the aliphatic carbonate (a), the type and amount of the catalyst, and other conditions (factors).
- the temperature at the bottom of the column should be 300 ° C or less. Preferably, the following is more preferable. If the temperature at the bottom of the column is higher than 300, side reactions easily proceed, which is not preferable.
- the undesired c- hold-up amount and the number of stages are closely related to the reaction time, that is, the residence time, because the pressure inside the reactive distillation column 1 is too high. That is, to increase the equilibrium conversion, it is necessary to lengthen the residence time to a certain extent, and to extend the residence time, it is necessary to increase the hold-up amount or increase the number of stages.
- the hold-up amount with respect to the empty column volume (volume) of the reactive distillation column 1 is preferably in the range of 0.05 to 0.75 by volume ratio, and more preferably in the range of 0.01 to 0.5. Is more preferred.
- the cost for manufacturing the reactive distillation column 1 is increased. -2 to 100 steps are preferred, taking into account the height restrictions, utility and fixed costs. Note that increasing the number of stages increases the efficiency of gas-liquid separation.
- the reflux ratio is preferably in the range of 0 to 100, more preferably in the range of 0 to 50, and even more preferably in the range of 0 to 25.
- the reflux ratio is preferably set to 0 or a relatively small value. If the difference in boiling point between one component of the raw material and the aliphatic carboxylic acid ester is relatively small, the reflux ratio should be set to a relatively large value in consideration of utility costs and fixed costs. Is preferred.
- heterogeneous catalyst When a heterogeneous catalyst is used, there is no need to separate the catalyst if the catalyst is held in the reactive distillation column 1. Even when the catalyst is used in a slurry form, a known method such as centrifugation or filtration is used after completion of the reaction. By using, the heterogeneous catalyst can be easily removed and recovered from the bottoms.
- the homogeneous catalyst can be easily separated and recovered from the bottom by using a known method such as distillation after the completion of the reaction. After the completion of the reaction, the catalyst is separated using the above-mentioned method, and then the aromatic carbonate ester as the target substance is easily isolated by using a known method such as distillation, extraction, and recrystallization. be able to.
- the raw material and the catalyst are fed through the raw material supply pipe Aliphatic carbonate (a)
- the aliphatic carbonate (a) is continuously supplied to the reactive distillation column 1 via the supply pipe 6 respectively.
- These raw materials and the aliphatic carbonate (a) may be supplied in liquid form, may be supplied in gaseous form, or may be supplied in gas-liquid mixed state. Further, the operating pressure of the reactive distillation column 1 is adjusted as required by the pressure regulating valve 11.
- Reactive distillation is performed by bringing the raw materials supplied to the reactive distillation column 1 into gas-liquid contact in the presence of a catalyst. As a result, an equilibrium reaction proceeds, and aromatic carbonate and aliphatic carboxylate are formed, and both are separated.
- the aromatic carbonate, which is the target flows down in the reactive distillation column 1 and is continuously extracted as bottoms (column bottoms). That is, the aromatic carbonate is continuously taken out of the reaction system as a bottom liquid.
- the aliphatic carboxylic acid ester as a by-product is continuously extracted as a distillate.
- the reaction efficiency of the transesterification reaction can be improved, and the aromatic carbonate can be continuously and efficiently produced.
- the reactive distillation apparatus is not limited to the configuration shown in FIG.
- two feed pipes are provided so that the aromatic carboxylic acid ester and the aliphatic ester and / or the aromatic / aliphatic ester can be separately and continuously supplied to the reactive distillation column.
- the aromatic carboxylic acid ester and the aliphatic carbonic acid ester and / or the aromatic / aliphatic carbonic acid ester are supplied to the respective stages by connecting the two raw material supply pipes to the respective stages. May be.
- aromatic carbonates include aliphatic carbonates and -Or Z or a part of an aromatic aliphatic carbonate may be contained, and an aliphatic carbonate and / or an aromatic aliphatic carbonate may include a part of an aromatic carboxylic acid ester. May be included.
- the stage for supplying the higher-boiling material be higher than the stage for supplying the lower-boiling material so that the two can be smoothly contacted in the reactive distillation column.
- the method for producing an aromatic carbonate according to the present invention uses the reaction distillation column 1 to continuously supply raw materials to the first stage, while supplying the raw materials to the first stage below the first stage.
- an aliphatic carbonate (a) having a boiling point lower than the boiling point of the reaction solution present in the second stage is continuously supplied to the second stage.
- the reaction efficiency of the transesterification can be improved. More thereto, and t can be produced aromatic carbonate continuously and efficiently, as described above, process for producing an aromatic carbonate according to the present invention, the second stage reactive distillation column Method 1 is the bottom of the tower.
- the ratio of the supply amount of the aliphatic carbonate (a) to the supply amount of the raw material is 0.001 to 5 times by weight. Is in the range of
- the aromatic carbonate can be produced continuously and more efficiently, respectively.
- the packed tower 20 has a packed bed 21, a rising section 22, a liquid storage section 23, and the like inside.
- the packing layer 21 is made of a perforated plate 21 a through which the reaction gas can pass, and a 3 mm 0 stainless steel Dickson packing (not shown) as a packing. ing.
- a perforated plate 21b through which the reaction gas can pass is placed on the filling. Then, this charge ⁇ layer 2 1, a reaction solution descending in the column, and a reaction gas which rises in the column to the lower c charging ⁇ layer 2 1 is summer so as to gas-liquid contact is
- a collector 25 comprising a funnel portion 25a formed in a funnel shape and a leg portion 25b formed in a tubular shape is provided.
- the funnel part 25a is made of stainless steel wire mesh.
- the leg 25b is inserted into the liquid reservoir 23, and the reaction solution collected in the funnel 25a is introduced into the liquid reservoir 23.
- the rising portion 22 is provided on the upper side of the packing layer 21 (the lower packing layer in FIG. 2), and is arranged on the peripheral portion in the horizontal section of the tower.
- the elevating part 22 raises the reaction gas substantially without gas-liquid contact.
- the liquid storage part 23 is formed in a cylindrical shape with a bottom and has a capacity of 25 m 1.
- the liquid reservoir 23 is provided on the upper side of the packing layer 21 (the lower packing layer in the figure), and is disposed at the center in the horizontal section.
- the liquid storage section 23 stores the reaction liquid that has descended from the packing layer 21 (the upper packing layer in the figure) provided on the upper side thereof through the collector 25. — You can do it.
- the liquid reservoir 23 reacts the raw materials in the reaction liquid in the presence of the catalyst without substantially bringing them into gas-liquid contact.
- the reaction liquid stored in the liquid storage section 23 becomes 25 ml or more, the reaction liquid overflows from the liquid storage section 23, and the overflowed reaction liquid descends in the column while traveling along the outer wall of the liquid storage section 23. Is supplied to the packing layer 21 provided on the lower side.
- the number of units including the packed bed 21, the liquid storage section 23, and the rising section 22 is five.
- a raw material supply pipe 5 is connected above the fifth stage of the packed tower 20, and an aliphatic carbonate (a) supply pipe 6 is connected below the first stage (lowest stage), that is, at the bottom of the column. did. Therefore, the packed tower 20 is a reaction section.
- the above-mentioned distillation column had a height of 80 cm, an inner diameter of 20 mm, and was filled with stainless steel Dickson packing of 3 mm 0 as a packing material. Therefore, the distillation column is a concentration section.
- the bottom of the packed tower 20 was heated with a heater to supply heat necessary for distillation.
- the operating conditions of the reactive distillation column 1 were as follows: the bottom temperature was 230 ° C., and the top pressure, which was the operating pressure, was 58.7 kPa (440 Torr).
- the reflux ratio was set to 0.41 by setting the amount of reflux per hour to 30 g.
- a raw material liquid composed of the raw material and titanium tetraphenoxide “T i (OP h) 4 J as a catalyst was continuously supplied to the reactive distillation column 1 via a raw material supply pipe 5.
- the feed rate per hour was 11.99 g
- the composition of the above raw materials was 31.2% by weight of phenyl valerate (aromatic carboxylate) and methylphenyl carbonate (aromatic and aliphatic carbonate). ester -) 21.6% by weight, dimethyl carbonate (aliphatic carbonate) 10.9% by weight, methyl valerate 26.6% by weight, phenol 1.6% by weight, and the target substance, diphenyl carbonate 8 2% by weight.
- the above titanate trienoxide was added such that the amount of titanium added to the raw materials (all components) was 400 ppm.
- dimethyl carbonate as aliphatic carbonate (a) [boiling point at 1 atm (760 T0 rr)] was added to reactive distillation column 1 through aliphatic carbonate (a) supply pipe 6. ° C) was supplied continuously in gaseous form.
- the reactive distillation column 1 was operated under the above operating conditions, and phenyl valerate and methylphenyl carbonate and dimethyl carbonate were brought into gas-liquid contact while transesterifying. Then, the distillate containing methyl valerate produced as a by-product was continuously taken out of the reaction system through the extraction pipe 9. The amount of the distillate withdrawn per hour was 72.7 g. On the other hand, the bottom liquid containing the generated dicarbonate was continuously taken out of the reaction system through the extraction pipe 8. The withdrawal volume of the bottoms per hour was 58.7 g. Table 2 shows the above-mentioned overhead pressures together with the reflux ratio.
- Raw material liquid Lipocarbon ester (a) IL ri n mK ft wood tt 3 ⁇ 4L ri Composition
- the composition As a result of analyzing the composition of the distillate, the composition was found to be 68.8% by weight of methyl valerate and 31.2% by weight of dimethyl carbonate. On the other hand, as a result of analyzing the composition of the bottom liquid, the composition was found to be 71.9% by weight of diphenyl carbonate, which is an aromatic carbonate, 19.3% by weight of phenyl valerate, and 6.4% by weight of methyl phenyl carbonate. 0.5% by weight of methyl valerate, 0.3% by weight of dimethyl carbonate, and 1.6% by weight of phenol. Therefore, the conversion of phenyl valerate was 69.7 mol%, and the conversion of dimethyl carbonate was 14.9 mol.
- Table 3 shows the flow rates and compositions of the distillate and the bottoms together with the reaction results.
- the conversion of dimethyl carbonate is a value expressed as a percentage by dividing the conversion of dimethyl carbonate by the supply of dimethyl carbonate supplied as aliphatic carbonate (a).
- Example 1 Using the same reactive distillation apparatus as in Example 1, the supply amount of the raw material liquid per hour in Example 1 was reduced from 19.9 g to 11.7 g, and aliphatic carbonate was used. The amount of ester (a) supplied per hour was 11.5 g. And the pressure at the top were changed from 58.7 kPa (440 Torr) to 66.7 kPa (500 Tor) and the reflux ratio was changed. The transesterification reaction was carried out under the same reaction conditions as in Example 1 except that was changed from 0.41 to 0.31. Table 1 shows the above reaction conditions, that is, the flow rates and compositions of the raw material liquid and the aliphatic carbonate (a).
- the composition As a result of analyzing the composition of the distillate, the composition was found to be 53.0% by weight of methyl valerate and 47.0% by weight of dimethyl carbonate. On the other hand, as a result of analyzing the composition of the bottoms, the composition was found to be 70.0% by weight of difuninyl carbonate, 18.6% by weight of phenyl valerate, 8.5% by weight of methyl phenyl carbonate, 0.4% by weight of methyl valerate % By weight, 0.6% by weight of dimethyl carbonate, and 1.8% by weight of phenol. Therefore, the conversion of phenyl valerate was 71.6 mol%, and the conversion of dimethyl carbonate was 5.7 mol%. Table 3 shows the flow rates and compositions of the distillate and bottoms, together with the reaction results.
- Example 1 Using the same reactive distillation apparatus as in Example 1, the feed rate of the raw material liquid per hour in Example 1 was reduced from 19.9 g to 12.0. The amount of ester (a) supplied per hour was 11.5 g. The pressure was changed from 58.7 kPa (440 T orr) to 46.7 kPa (350 T orr) and the reflux ratio was 0. The transesterification reaction was carried out under the same reaction conditions as in Example 1 except that each was changed from 41 to 0.52. That is, a transesterification reaction for comparison was performed without using the aliphatic carbonate (a). Table 1 shows the above reaction conditions, that is, the raw material liquid and the flow rate and composition of the aliphatic carbonate (a).
- the composition As a result of analyzing the composition of the distillate, the composition was found to be 73.1% by weight of methyl valerate and 26.9% by weight of dimethyl carbonate. On the other hand, as a result of analyzing the composition of the above bottom liquid, the composition was as follows: 61.4% by weight of diphenyl carbonate, 31.9% by weight of phenyl valerate, 4.5% by weight of methyl phenyl carbonate, 0.6% by weight of methyl valerate % And phenol 1.6% by weight. Therefore, the conversion of phenyl valerate was as low as 47.1 mol%.
- Table 3 c Example 3
- the operating conditions of the reactive distillation column 1 were as follows: the bottom temperature was 230 ° C., and the top pressure was 60. OkPa (450 Torr). The reflux ratio was set at 0.34. -Then, a raw material liquid composed of the raw material and titanate phenoxide was continuously supplied to the reactive distillation column 1 via the raw material supply pipe 5. The supply amount of the raw material liquid per hour was set to 122.7 g.
- composition of the above raw materials is 25.3% by weight of phenyl valerate, 17.7% by weight of methyl phenyl carbonate, 5.9% by weight of dimethinole carbonate, 16.6% by weight of methyl valerate, 25% by weight of phenol 1% by weight and 9.5% by weight of divinyl carbonate.
- titanium tetrafluenoxide described above was added so that the amount of titanium added to the raw material (all components) was 4.58 ppm.
- dimethyl carbonate was continuously supplied to the reactive distillation column 1 in gaseous form via the aliphatic carbonate (a) supply pipe 6.
- the supply amount of dimethyl carbonate per hour was 15.4 g.
- Table 1 shows the above reaction conditions, that is, the raw material liquid and the flow rate and composition of the aliphatic carbonate (a).
- the reaction distillation column 1 was operated under the above operating conditions, and gas-liquid contact was carried out while transesterifying phenyl valerate with methylphenyl carbonate and dimethyl carbonate. Then, the distillate containing by-product methyl valerate was continuously taken out of the reaction system. The amount of the distillate withdrawn per hour was 87.5 g. On the other hand, the bottoms containing the generated diphenyl carbonate were continuously taken out of the reaction system. The withdrawal amount of the bottoms per hour was 50.6 g.
- Table 2 The above column pressures are shown in Table 2 together with the reflux ratio.
- the composition of the distillate As a result of analyzing the composition of the distillate, the composition was found to be 40.5% by weight of methyl valerate, 25.0% by weight of dimethyl carbonate, and 34.5% by weight of phenol. On the other hand, as a result of analyzing the composition of the above bottom liquid, the composition was found to be 74.6% by weight of diphenyl carbonate, 15.1% by weight of phenyl valerate, 7.7% by weight of methyl phenyl carbonate, and 7.7% by weight of methyl valerate. Chill 0,4 wt%, dimethyl carbonate -0.4% by weight and phenol 1.9% by weight. Therefore, the conversion of phenyl valerate was 75.4 mol%, and the conversion of dimethyl carbonate was 3.6 mol%. Table 4 shows the flow rates and compositions of the distillate and the bottoms together with the reaction results.
- Example 1 Using the same reactive distillation apparatus as in Example 1, the feed rate of the raw material liquid in Example 3 per hour was changed from 122.7 g to 122.8 g, and aliphatic carbonate was used.
- the hourly feed rate of the ester (a) was changed from 15.4 g to 0 g, and the overhead pressure was increased from 60.0 kPa (450 Torr) to 46.7.
- the transesterification reaction was carried out under the same reaction conditions as in Example 3 except that kPa (350 Torr) and the reflux ratio were changed from 0.34 to 0.43, respectively. . That is, a transesterification reaction for comparison was performed without using the aliphatic carbonate (a).
- Table 1 shows the above reaction conditions, that is, the raw material liquid and the flow rate and composition of the aliphatic carbonate (a).
- the composition of the distillate As a result of analyzing the composition of the distillate, the composition was found to be 41.9% by weight of methyl valerate, 13.8% by weight of dimethyl carbonate, and 44.3% by weight of phenol. On the other hand, as a result of analyzing the composition of the bottoms, the composition was found to be 62.6% by weight of diphenyl carbonate, 31.0% by weight of phenyl valerate, Tylphenyl 4.3% by weight and phenol 2.2% by weight. Therefore, the conversion of fumaryl valerate was as low as 46.4 mol%.
- the flow rates and compositions of the distillate and the bottoms, together with the reaction results, are shown in Table 4.
- the method for producing an aromatic carbonate according to the present invention can improve the transesterification reaction efficiency in producing an aromatic carbonate, and thus can continuously produce an industrially useful aromatic carbonate. It can be manufactured efficiently.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/000,465 US5874605A (en) | 1996-06-14 | 1997-06-10 | Process for preparing aromatic carbonic ester |
| EP97924379A EP0854132A4 (en) | 1996-06-14 | 1997-06-10 | METHOD FOR PRODUCING AROMATIC CARBONESTERS |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8/154542 | 1996-06-14 | ||
| JP8154542A JP2922848B2 (ja) | 1996-06-14 | 1996-06-14 | 芳香族炭酸エステルの製造方法 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1997047586A1 true WO1997047586A1 (en) | 1997-12-18 |
Family
ID=15586543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP1997/002000 Ceased WO1997047586A1 (en) | 1996-06-14 | 1997-06-10 | Process for the preparation of aromatic carbonic ester |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5874605A (ja) |
| EP (1) | EP0854132A4 (ja) |
| JP (1) | JP2922848B2 (ja) |
| WO (1) | WO1997047586A1 (ja) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8309750B2 (en) | 2007-08-20 | 2012-11-13 | Shell Oil Company | Process for the preparation of a diaryl carbonate |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19859290A1 (de) * | 1998-12-22 | 2000-06-29 | Bayer Ag | Verfahren zur Herstellung von Diarylcarbonaten |
| WO2001000560A1 (en) * | 1999-06-29 | 2001-01-04 | Lg Chemical Ltd. | Process for preparing aromatic carbonates |
| US6420588B1 (en) * | 2001-07-24 | 2002-07-16 | General Electric Company | Interfacial method of preparing ester-substituted diaryl carbonates |
| BRPI0514936A (pt) * | 2004-09-27 | 2008-07-01 | Asahi Kasei Chemicals Corp | aperfeiçoamento em um processo industrial para a produção de um carbonato aromático |
| DE102005042505A1 (de) * | 2005-09-07 | 2007-03-08 | Basf Ag | Verfahren zur Herstellung von Dioxolan |
| GB201122054D0 (en) * | 2011-12-21 | 2012-02-01 | Lucite Int Uk Ltd | A continuous process for the carbonylation of ethylene |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56123948A (en) * | 1974-06-25 | 1981-09-29 | Anic Spa | Manufacture of diphenylcarbonic ester |
| JPH049358A (ja) * | 1989-12-28 | 1992-01-14 | Asahi Chem Ind Co Ltd | ジアリールカーボネートの連続的製造方法 |
| JPH07304713A (ja) * | 1994-05-10 | 1995-11-21 | Nippon Shokubai Co Ltd | 芳香族炭酸エステルの製造方法 |
| JPH0873412A (ja) * | 1994-07-05 | 1996-03-19 | Nippon Shokubai Co Ltd | 炭酸エステルの製造方法 |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4533504A (en) * | 1982-01-08 | 1985-08-06 | General Electric Company | Process for the preparation of diaryl carbonates |
| JPH0791236B2 (ja) * | 1989-12-28 | 1995-10-04 | 旭化成工業株式会社 | 芳香族カーボネート類の連続的製造法 |
| KR940005956B1 (ko) * | 1989-12-28 | 1994-06-25 | 아사히가세이고오교 가부시끼가이샤 | 방향족 카르보네이트의 연속 제조방법 |
| TW310322B (ja) * | 1994-05-25 | 1997-07-11 | Nippon Catalytic Chem Ind | |
| US5714627A (en) * | 1995-08-28 | 1998-02-03 | Mitsubishi Gas Chemical Company, Inc. | Method for preparing aromatic carbonate |
| JP2854279B2 (ja) * | 1996-05-21 | 1999-02-03 | 株式会社日本触媒 | 反応蒸留装置および反応蒸留方法 |
-
1996
- 1996-06-14 JP JP8154542A patent/JP2922848B2/ja not_active Expired - Lifetime
-
1997
- 1997-06-10 US US09/000,465 patent/US5874605A/en not_active Expired - Fee Related
- 1997-06-10 EP EP97924379A patent/EP0854132A4/en not_active Ceased
- 1997-06-10 WO PCT/JP1997/002000 patent/WO1997047586A1/ja not_active Ceased
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56123948A (en) * | 1974-06-25 | 1981-09-29 | Anic Spa | Manufacture of diphenylcarbonic ester |
| JPH049358A (ja) * | 1989-12-28 | 1992-01-14 | Asahi Chem Ind Co Ltd | ジアリールカーボネートの連続的製造方法 |
| JPH07304713A (ja) * | 1994-05-10 | 1995-11-21 | Nippon Shokubai Co Ltd | 芳香族炭酸エステルの製造方法 |
| JPH0873412A (ja) * | 1994-07-05 | 1996-03-19 | Nippon Shokubai Co Ltd | 炭酸エステルの製造方法 |
Non-Patent Citations (1)
| Title |
|---|
| See also references of EP0854132A4 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8309750B2 (en) | 2007-08-20 | 2012-11-13 | Shell Oil Company | Process for the preparation of a diaryl carbonate |
Also Published As
| Publication number | Publication date |
|---|---|
| US5874605A (en) | 1999-02-23 |
| JP2922848B2 (ja) | 1999-07-26 |
| JPH101460A (ja) | 1998-01-06 |
| EP0854132A1 (en) | 1998-07-22 |
| EP0854132A4 (en) | 2000-05-10 |
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