WO2010137602A1 - メタクリル酸製造触媒の製造方法およびメタクリル酸の製造方法 - Google Patents
メタクリル酸製造触媒の製造方法およびメタクリル酸の製造方法 Download PDFInfo
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- WO2010137602A1 WO2010137602A1 PCT/JP2010/058869 JP2010058869W WO2010137602A1 WO 2010137602 A1 WO2010137602 A1 WO 2010137602A1 JP 2010058869 W JP2010058869 W JP 2010058869W WO 2010137602 A1 WO2010137602 A1 WO 2010137602A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0215—Coating
- B01J37/0219—Coating the coating containing organic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/14—Phosphorus; Compounds thereof
- B01J27/186—Phosphorus; Compounds thereof with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J27/195—Phosphorus; Compounds thereof with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium with vanadium, niobium or tantalum
- B01J27/198—Vanadium
- B01J27/199—Vanadium with chromium, molybdenum, tungsten or polonium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
- B01J37/0027—Powdering
- B01J37/0045—Drying a slurry, e.g. spray drying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0215—Coating
- B01J37/0221—Coating of particles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
- C07C51/21—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen
- C07C51/25—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of unsaturated compounds containing no six-membered aromatic ring
- C07C51/252—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of unsaturated compounds containing no six-membered aromatic ring of propene, butenes, acrolein or methacrolein
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2523/00—Constitutive chemical elements of heterogeneous catalysts
Definitions
- the present invention relates to a method for producing a catalyst for producing methacrylic acid, which is used when producing methacrylic acid by gas phase catalytic oxidation of methacrylic acid production raw materials such as methacrolein, isobutyraldehyde, and isobutyric acid.
- These catalysts are usually produced by processes such as preparation of raw material mixture, drying, molding, and firing. Regarding the production of catalysts that stably exhibit high performance, many reports have been made on molding methods and calcination methods.
- Patent Document 1 proposes a method in which heat-resistant fibers are mixed and molded for the purpose of improving the strength of the catalyst.
- Patent Document 2 proposes a method in which, in the production of a heteropolyacid salt catalyst, the molded catalyst is treated in a constant humidity atmosphere and then calcined.
- catalysts containing heteropolyacids as active ingredients have an extremely high affinity for water and alcohols compared to heteropolyacid-based catalysts. Simply treat the molded catalyst in a constant humidity atmosphere and then calcinate it. However, it was insufficient to stably produce a high-performance catalyst.
- a coating method in which a heteropolyacid is used as an active ingredient and water or alcohol and / or an aqueous solution of alcohol is used as a binder and supported on a carrier, production of a catalyst exhibiting stable and high performance is produced. It was difficult.
- An object of the present invention is to provide a method for producing a catalyst for producing methacrylic acid that eliminates these difficulties and stably exhibits high activity and high performance.
- the present inventors have determined that the moisture content of the catalyst powder used for molding, the molding process, and the like when the Mo-VP-Cu-based heteropolyacid is used as an active ingredient and molding is performed by a coating method.
- a coating method By controlling the temperature and humidity, and the temperature and humidity of the firing process, respectively, it was found that a catalyst for methacrylic acid production showing stable and high activity and high performance could be produced, and the present invention was completed. .
- the present invention (1) A method for producing a catalyst for methacrylic acid production, comprising coating a carrier with a catalyst component powder containing a heteropolyacid containing molybdenum, phosphorus, vanadium and copper as an active ingredient, and further firing the carrier. Using catalyst component powder having a water content of 8.0 to 10.0% by weight, and coating the catalyst component powder on the support in an atmosphere at a temperature of 15 to 35 ° C. and an absolute humidity of 0.007 to 0.025 kg / kgDA A catalyst molding process, The catalyst molded in the catalyst molding step is put into a drying and calcining apparatus in an atmosphere with a temperature of 15 to 90 ° C. and an absolute humidity of 0.007 to 0.025 kg / kg DA. A method for producing a catalyst for methacrylic acid production, comprising: a calcining step in which the temperature is raised to a temperature and calcined.
- the active component of the catalyst for producing methacrylic acid is represented by the general formula (I) Mo a P b V c Cu d X e O f (I) (In the formula, Mo, P, V, and Cu represent molybdenum, phosphorus, vanadium, and copper, respectively.
- X represents arsenic, silver, zirconium, boron, germanium, tin, lead, chromium, bismuth, cobalt
- O represents an oxygen element
- the subscript at the lower right of the element symbol represents the atomic ratio of each element
- a 10
- b is 0.1 or more and 6 or less
- c is 0.3 or more and 6 or less
- d is 0.01 or more and 5 or less
- e is 5 or less including
- f is a numerical value determined by the oxidation state of each element.
- a highly active and high performance methacrylic acid production catalyst comprising a heteropolyacid containing molybdenum, phosphorus, vanadium and copper as an active component can be stably produced by a coating method.
- the production method of the present invention comprises a step of preparing an aqueous solution containing a compound containing catalyst components such as molybdenum, phosphorus, vanadium and copper, or an aqueous dispersion of the compound (hereinafter referred to as slurry together), It includes a step of drying to obtain a powder, a step of molding the obtained powder by a coating method, and a step of firing thereafter.
- a step of preparing an aqueous solution containing a compound containing catalyst components such as molybdenum, phosphorus, vanadium and copper, or an aqueous dispersion of the compound hereinafter referred to as slurry together
- components other than Mo, V, P and Cu include As, Ag, Zr, B, Ge, Sn, Pb, Cr, Bi, Co, Ni, Ce, W, Fe, Al, Mg, Sb.
- One or more selected from the group consisting of Ti and Ti are preferred, and As and Sb are particularly preferred.
- chlorides, sulfates, nitrates, oxides or acetates of component elements can be used.
- preferred compounds include molybdenum oxide, vanadium pentoxide, antimony trioxide, cerium oxide, zinc oxide, germanium oxide and the like; orthophosphoric acid, phosphoric acid, arsenic acid, boric acid, aluminum phosphate, Examples include acids (or salts thereof) such as 12 tungstophosphoric acid. These may be used singly or in combination of two or more. *
- the ratio of each component of the catalyst in the present invention is such that the atomic ratio is 0.1 or more and 6 or less, preferably 0.3 or more and 4 or less, and vanadium is 0.3 or more and 6 or less, with respect to molybdenum 10 Is 0.5 or more and 2 or less, and copper is 0.01 or more and 5 or less, preferably 0.1 or more and 3 or less.
- the types of other components to be used as necessary and the usage ratio thereof are appropriately determined so as to obtain a catalyst exhibiting optimum performance in accordance with the usage conditions of the catalyst.
- Preferred catalysts used under normal conditions are those of the following formula (I)
- Mo, P, V, and Cu represent molybdenum, phosphorus, vanadium, and copper, respectively.
- X represents arsenic, silver, zirconium, boron, germanium, tin, lead, chromium, bismuth, cobalt.
- Represents one or more elements selected from nickel, cerium, tungsten, iron, aluminum, magnesium, antimony, or titanium, O represents an oxygen atom, the subscript at the lower right of the element symbol is the atomic ratio of each element, and a 10, b is 0.1 or more and 6 or less, c is 0.3 or more and 6 or less, d is 0.01 or more and 5 or less, e is 5 or less including 0, and f is an oxidation state of each element.
- the proportion of each component compound used in preparing the slurry may be such that the atomic ratio of each component is a predetermined proportion, preferably in the above-described range.
- the amount of water used is not particularly limited as long as the total amount of the compound to be used can be completely dissolved or can be uniformly mixed (dispersed), but is appropriately determined in consideration of the drying method and drying conditions described below.
- the amount of water may be large, but if it is too large, it will be difficult to control the particle size of the catalyst component powder after drying within a predetermined range, and the energy cost of the drying process will be high, and drying will take time. It is preferable to use an appropriate amount because there are many disadvantages.
- the drying method is not particularly limited as long as the moisture content of the powder after drying can be controlled within a predetermined range, and examples thereof include drum drying, freeze drying, and spray drying.
- spray drying which can be dried from a slurry state to powder or granules in a short time is preferable.
- the drying temperature varies depending on the concentration of the slurry, the liquid feeding speed, etc., but the outlet temperature of the dryer is generally 85 to 130 ° C.
- the catalyst component powder includes those pulverized in this way.
- Examples of the method for controlling the moisture content in the catalyst component powder within a predetermined range include methods such as the temperature at the inlet and outlet of the dryer, drying time, humidity control of the drying atmosphere, and various combinations of the above methods. be able to.
- the method of drying in an atmosphere in which the humidity is controlled has good uniformity of moisture content in the obtained catalyst component powder and is easy to control.
- the moisture content of the catalyst component powder can be controlled by controlling the amount of moisture in the air introduced into the spray dryer and adjusting the spray drying speed and the outlet temperature of the spray dryer.
- the appropriate amount of moisture in the air to be introduced into the spray dryer or the like varies depending on the drying conditions. In normal cases, the dew point temperature is 15 ° C. or higher, for example, by supplying humidified air using a humidifier. It is preferable to use air containing moisture.
- the heteropolyacid contains crystal water in its crystal structure, but when the amount of crystal water changes, the surface area changes and the affinity with binder components such as water or alcohol changes. Controlling the moisture content within a predetermined range and using it in the molding process is extremely important for stably producing a high-performance catalyst.
- the water content of the catalyst component powder used in the molding step is suitably 8.0 to 10.0% by weight. When the moisture content of the catalyst component powder itself is lower than the predetermined range, the catalyst component powder is hardly supported on the carrier. When the supported amount of the catalyst component powder is lowered, problems such as a decrease in the activity of the catalyst occur.
- the powder tends to adhere to the wall surface of the coating device, resulting in a decrease in the amount supported on the carrier, and support in the firing step of the molded product. This is not preferable because inconveniences such as exfoliation of the formed catalyst component easily occur.
- the water content is higher than the predetermined range, it is not preferable because it is not supported uniformly on the carrier or the coating catalyst component is easily peeled off from the carrier in the firing step.
- the method for measuring the moisture content in the catalyst component powder is as follows.
- molding aids such as silica gel, diatomaceous earth, alumina powder, crystalline cellulose powder, and starch powder.
- the amount of the molding aid used is usually 1 to 30 parts by weight per 100 parts by weight of the catalyst component powder.
- inorganic fibers such as ceramic fibers and whiskers, which are inert to the catalyst component as necessary, as a strength improving material is useful for improving the mechanical strength of the catalyst.
- the amount of these fibers used is usually 1 to 30 parts by weight per 100 parts by weight of the catalyst component powder.
- fibers that react with a heteropolyacid catalyst such as potassium titanate whiskers or basic magnesium carbonate whiskers are not preferred. Since these molding aids and strength improvers are preferably dispersed uniformly and coated on the carrier, it is preferable to use them in the molding process by mixing them uniformly with the catalyst component powder in advance.
- the catalyst component powder obtained as described above, or a mixture obtained by mixing this with a molding aid and a strength improving material is formed into a molded body having a size of about 3 to 15 mm. It is molded and filled into a reaction tube of a fixed bed reactor and used for methacrylic acid production reaction.
- molding methods various methods such as tableting molding, extrusion molding, and Malmo molding are conceivable, but a catalyst molded by a method in which a carrier is coated with a catalyst component powder or a molding aid and / or a strength improver mixture is selected. The improvement of the property and the removal efficiency of reaction heat can be expected.
- the usual coating method can be used for coating, the rolling granulation method described below is preferable.
- the carrier in the container is agitated by repeated rotation and revolution
- the carrier powder is coated on the carrier by adding a binder and a catalyst powder or a molding aid and / or a strength improver mixture (hereinafter referred to as “supported powder”).
- the method for adding the binder and the supported powder is not particularly limited.
- the binder and the supporting powder are mixed 1) in advance, 2) added simultaneously with the addition to the fixed container, 3) the binder is added after the supporting powder is added to the fixed container, and 4) the binder.
- adding the support powder after the addition to the fixed container 5) dividing the support powder and the binder, and adding 2) to 4) in an appropriate combination.
- the binder at least one selected from the group consisting of water and an alcohol having a boiling point of 150 ° C. or less under 1 atm can be used, but most of the binder needs to be removed in the drying and baking steps after coating. Therefore, it is preferable that the boiling point is not so high.
- the alcohol include alcohols such as methanol, ethanol, propanols, and butanols, and ethanol is particularly preferable.
- alcohol in addition to alcohol containing no organic compound other than the alcohol, other types of alcohol such as denatured ethanol or a small amount of organic compound (mixed alcohol) can be used. From the viewpoint of removing the alcohol used, it is preferable that the concentration of the alcohol having a boiling point of 150 ° C. or less at 1 atmosphere is 70% by weight or more.
- water can be used in addition to alcohol, but it is preferable to use an aqueous alcohol solution from the viewpoint of operability in the molding process.
- an ethanol aqueous solution having an arbitrary concentration can be used, but the ethanol concentration is preferably 10% by weight or more.
- the amount of these binders used is usually 10 to 60 parts by weight, preferably 15 to 40 parts by weight, based on 100 parts by weight of the supported powder.
- the carrier includes silicon carbide, alumina, silica alumina, mullite and the like.
- the carrier has a diameter of 1 to 15 mm, preferably 2.5 to 10 mm, and includes a spherical carrier. These carriers are usually those having a porosity of 10 to 70%.
- the carrier powder is coated on the carrier in this way, and the molded product obtained at this time usually has a diameter of about 3 to 15 mm.
- the catalyst performance varies greatly depending on the temperature in the molding process and the humidity in the air. Controlling is extremely important for stably producing a high-performance catalyst. These conditions greatly affect the catalyst performance even in the vicinity of room temperature and normal atmospheric humidity. If molding is performed without managing these conditions, a stable high-performance catalyst cannot be produced. .
- the atmosphere of the apparatus for carrying out the molding process and the peripheral equipment can be usually 15 to 35 ° C. and the absolute humidity 0.007 to 0.025 kg / kgDA, but the workability, temperature and humidity are adjusted.
- the temperature is preferably 20 to 30 ° C. from the viewpoint of the cost required for the above.
- the absolute humidity is 0.007 to 0.021 kg / kgDA and the temperature is 20 to 30 ° C.
- the relative humidity is preferably 99% or less.
- the interaction between the molded product and the air atmosphere depends on the amount of moisture contained in the air, so the appropriate humidity range is controlled not by the relative humidity generally used but by the absolute humidity. Should. Of course, the absolute humidity can be converted into the relative humidity. However, since the saturated vapor pressure increases with temperature, the relative humidity decreases with increasing temperature even at the same absolute humidity.
- the absolute humidity described in the present invention is the weight (kg) of water vapor removed from 1 kg of dry air weight excluding water vapor in the atmosphere.
- the molded product molded by the method of the present invention As a catalyst that can be used in the reaction, it is then necessary to perform drying and firing. In these processes, it is necessary to remove most of the binders such as water and alcohol used for molding, and to produce industrial catalysts with sufficient strength or suitable physical properties to withstand practical use. When used in the reaction, it is a necessary step in order not to generate unnecessary heat generation and by-products.
- the molded product molded by the coating method in the above molding process needs to be promptly placed in a certain atmosphere. Temperature and humidity are important as the atmospheric conditions for storing the molded product. For example, when stored in a high humidity atmosphere for a long time, moisture in the air acts on the surface of the molded product, and the catalytically active component on the surface may be dissolved. When the humidity is extremely low, moisture, alcohol, etc. in the molded product rapidly evaporate, and the supported powder tends to be peeled off from the carrier, which may reduce the catalyst strength. In addition, when the temperature is high, binders such as water and alcohol rapidly evaporate, so that the supported powder is easily peeled off from the support and the catalyst strength is lowered. In more extreme cases, the supported powder is used as a support.
- the organic compound contained in the molded product may rapidly evaporate if the temperature is high, and the surrounding atmosphere may become an explosion range condition. is there.
- a binder such as alcohol takes away heat of vaporization when it evaporates, the temperature of the surface of the molded product is lowered, and condensation on the surface of the molded product may be dissolved to dissolve the catalytically active components on the surface. is there.
- the drying chamber and the drying apparatus used in the present invention are not particularly limited, but it is necessary to control humidity in addition to temperature. Therefore, from the viewpoint of stability and ease of control, it is not an open type, but a closed type and the internal air A device in which a part circulates is preferred.
- baking may be performed by another apparatus after drying, it is easier to use the same apparatus for baking as drying because there is no need to adjust the atmosphere when moving the molded product after drying.
- the conditions for charging the molded product into the drying and baking apparatus are preferably a temperature of 15 to 90 ° C. and an absolute humidity of 0.007 to 0.025 kg / kg DA, and a temperature of 30 to 75 ° C. and an absolute humidity of 0.007 to 0.021 kg / kg. It is preferable to put in an atmosphere of kgDA and a relative humidity of 99% or less in the temperature range.
- a neosensor indoor temperature / humidity sensor (model number TY7043 and HY7043) manufactured by Yamatake Corporation or a temperature / humidity meter (model number HMT361) manufactured by VAISALA can be used. .
- the calcining device prevents the temperature of the molded product from becoming too high due to the heat of alcohol oxidation reaction during heating or the oxidation reaction of organic compounds. It is necessary to raise the temperature gradually. Firing is usually performed at a temperature of 420 ° C. or lower, but is preferably performed at 380 ° C. or lower.
- the present invention will be described in more detail with reference to examples.
- this invention is not limited to a following example, unless the meaning is exceeded.
- the part in an Example and a comparative example means a weight part,% means weight%, respectively.
- the methacrolein conversion rate, methacrylic acid yield, and methacrylic acid selectivity are defined as percentages calculated on a molar basis as in the following formulas (2), (3), and (4), respectively.
- the reaction product was qualitatively and quantified by gas chromatography.
- Example 1 7100 ml of pure water was charged with 1000 g of molybdenum trioxide, 44.23 g of vanadium pentoxide, 88.11 g of 85% strength aqueous phosphoric acid solution, 11.05 g of copper oxide, and 82.18 g of 60% strength aqueous arsenic acid solution at 92 ° C. The mixture was heated and stirred for 3 hours to prepare a slurry. Thereafter, this slurry was spray-dried while introducing air prepared at 25 ° C. and a relative humidity of 80.0% to obtain a catalyst powder having the following composition.
- the outlet temperature of the spray dryer was 100 to 110 ° C., the median particle diameter of the obtained catalyst powder was 75 ⁇ m, and the water content was 9.1%.
- Mo 10 P 1.1 V 0.7 Cu 0.2 As 0.5 The oxygen content varies depending on the oxidation state and cannot be specified).
- the obtained molded product was put into a furnace having a furnace temperature of 50 ° C. and an absolute humidity of 0.016 kg / kg DA, held for 12 minutes after being charged, and then heated to 70 ° C. in 12 minutes (at 70 ° C. Relative humidity of 8.2%). Thereafter, the temperature was gradually raised and calcined at 330 ° C. for 5 hours under air flow to obtain a catalyst for producing methacrylic acid.
- Example 2 The slurry prepared in Example 1 was spray-dried while introducing air adjusted to a relative humidity of 72.0% at 25 ° C. to obtain a catalyst powder having the following composition.
- the outlet temperature of the spray dryer was 100 to 110 ° C.
- the median particle diameter of the obtained catalyst powder was 75 ⁇ m
- the water content was 8.6%.
- Mo 10 P 1.1 V 0.7 Cu 0.2 As 0.5 The oxygen content varies depending on the oxidation state and cannot be specified).
- the obtained molded product was put into a firing furnace having a furnace temperature of 50 ° C. and an absolute humidity of 0.016 kg / kg DA, held for 10 minutes after being charged, and then heated to 70 ° C. in 12 minutes (at 70 ° C. Relative humidity of 8.2%). Thereafter, the temperature was gradually raised and calcined at 330 ° C. for 5 hours under air flow to obtain a catalyst for producing methacrylic acid.
- the catalyst obtained had a methacrolein conversion rate of 82.9%, a methacrylic acid selectivity of 79.9%, and a methacrylic acid yield of 66.2%.
- Comparative Example 1 The slurry prepared in Example 1 was spray-dried while introducing air prepared at a relative humidity of 20.0% at 15 ° C. to obtain a catalyst powder having the following composition.
- the outlet temperature of the spray dryer was 100 to 110 ° C.
- the median particle diameter of the obtained catalyst powder was 75 ⁇ m
- the water content was 7.5%.
- Mo 10 P 1.1 V 1.2 Cu 0.2 As 0.3 The oxygen content varies depending on the oxidation state and cannot be specified).
- the obtained catalyst powder was molded and fired in the same manner as in Example 2 to obtain a catalyst for producing methacrylic acid.
- the catalyst obtained had a methacrolein conversion of 76.8%, a methacrylic acid selectivity of 83.2%, and a methacrylic acid yield of 63.9%.
- Example 3 The room temperature and absolute humidity of the rolling granulator that performs the molding are 27 ° C, 0.018 kg / kgDA (relative humidity 79.0%), and the temperature and absolute humidity when the molded product is put into the firing furnace.
- a catalyst for production of methacrylic acid was obtained under the same conditions as in Example 2 except that the temperature was changed to 50 ° C. and the absolute humidity was changed to 0.015 kg / kgDA.
- the catalyst obtained had a methacrolein conversion rate of 81.6%, a methacrylic acid selectivity of 81.6%, and a methacrylic acid yield of 66.6%.
- Comparative Example 2 The room temperature and absolute humidity of the rolling granulator for performing molding are 16 ° C. and 0.0055 kg / kg DA, and the temperature and absolute humidity when the molded product is charged into the firing furnace are the furnace temperature of 50 ° C. and the absolute humidity of 0. Except for changing to 017 kg / kgDA, the catalyst was produced under the same setting conditions as in Example 2 to obtain a methacrylic acid production catalyst.
- the catalyst obtained had a methacrolein conversion of 74.4%, a methacrylic acid selectivity of 82.9%, and a methacrylic acid yield of 61.7%.
- Example 4 A catalyst for production of methacrylic acid was obtained under the same setting conditions as in Example 3 except that the temperature in the furnace at the time of charging the molded product into the drying and firing apparatus was changed to 50 ° C. and the absolute humidity was 0.013 kg / kgDA. As for the reaction results of the obtained catalyst, methacrolein conversion was 81.7%, methacrylic acid selectivity was 79.8%, and methacrylic acid yield was 65.3%.
- the catalyst produced in the present invention can be used when producing methacrylic acid by gas phase catalytic oxidation of a raw material for producing methacrylic acid such as methacrolein, isobutyraldehyde, isobutyric acid, etc. by a multi-tubular fixed bed reactor. . *
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Abstract
Description
本発明は、これらの困難を解消し、安定して高活性、高性能を示すメタクリル酸製造用触媒の製造方法を提供することを目的とする。
(1) モリブデン、リン、バナジウム及び銅を含むヘテロポリ酸を活性成分とする触媒成分粉末を担体にコーティングし、更にこれを焼成する、メタクリル酸製造用触媒の製造方法であって、
含水率が8.0~10.0重量%である触媒成分粉末を使用し、温度15~35℃、絶対湿度0.007~0.025kg/kgDAの雰囲気下で担体に該触媒成分粉末をコーティングする触媒成型工程と、
該触媒成型工程で成型した触媒を温度15~90℃、絶対湿度0.007~0.025kg/kgDAの雰囲気下の乾燥及び焼成装置に投入し、投入後30分以内に相対湿度10%以下になる温度まで昇温して焼成する焼成工程と、を有することを特徴とするメタクリル酸製造用触媒の製造方法。
(3) 前記触媒成型工程において、触媒成分粉末とともにバインダーを使用し、該バインダーとして、水及び1気圧下での沸点が150℃以下のアルコールのうち少なくとも1種類を使用する、上記(1)または上記(2)に記載の製造方法。
(4) 前記バインダーとして前記アルコールを使用し、該アルコール中のメチルアルコール又はエチルアルコール濃度が70重量%以上である、上記(3)に記載の製造方法。
(5) 前記バインダーがエチルアルコールを含む、上記(3)または上記(4)に記載の製造方法。
MoaPbVcCudXeOf (I)
(式中Mo、P、V、及びCuは、モリブデン、リン、バナジウム及び銅の各元素をそれぞれ表す。Xは、砒素、銀、ジルコニウム、ホウ素、ゲルマニウム、錫、鉛、クロム、ビスマス、コバルト、ニッケル、セリウム、タングステン、鉄、アルミニウム、マグネシウム、アンチモン及びチタンから選ばれる一種以上の元素を表す。Oは酸素元素を表す。元素記号右下の添字は各元素の原子比であり、a=10とした時、bは0.1以上6以下、cは0.3以上6以下、dは0.01以上5以下、eは0を含む5以下、fは各々の元素の酸化状態によって定まる数値である。)
で表される、上記(1)~上記(5)のいずれか一項に記載の触媒製造方法。
(7) 上記(1)~上記(6)のいずれか1項に記載の製造方法により製造された触媒の存在下で、メタクロレイン、イソブチレン、またはイソ酪酸を気相接触酸化することによるメタクリル酸の製造方法。
(式中Mo、P、V、及びCuは、モリブデン、リン、バナジウム、および銅の各元素をそれぞれ表す。Xは、砒素、銀、ジルコニウム、ホウ素、ゲルマニウム、錫、鉛、クロム、ビスマス、コバルト、ニッケル、セリウム、タングステン、鉄、アルミニウム、マグネシウム、アンチモン、またはチタンから選ばれる一種以上の元素を表す。Oは酸素原子をあらわす。元素記号右下の添字は各元素の原子比であり、a=10とした時、bは0.1以上6以下、cは0.3以上6以下、dは0.01以上5以下、eは0を含む5以下、fは各々の元素の酸化状態によって定まる数値である。)で示される活性成分組成を有するものである。一般式(I)の組成比としてより好ましくは、a=10とした時、bは0.3以上で4以下、cは0.5以上2以下、dは0.1以上3以下、eは0.1以上3以下、fは各々の元素の酸化状態によって定まる数値である。
触媒成分粉末中の含水率測定の方法は次の通りである。計量した触媒成分粉末(加熱前粉末)をるつぼに入れ、それを槽内温度が400℃に設定されている電気炉に入れる。2時間後、るつぼを取り出し、るつぼ中の触媒成分粉末(加熱後粉末)を計量した後、以下の計算方法で含水率を算出する。
含水率(重量%)=100×(加熱前粉末重量-加熱後粉末重量)÷加熱前粉末重量
このようにして担持粉体を担体にコーティングするが、この際得られる成型品は通常直径が3~15mm程度である。
成型工程の温度管理は、通常の温度調節機器で行うことができ、また湿度管理は通常の加湿器または除湿機を使用することができるが、成型工程を実施する装置及び周辺機器の室内容積に比べ十分な能力を有する必要がある。
また、温度が高い場合には、水やアルコールなどのバインダーが急速に蒸発するため、担持粉体が担体から剥離しやすくなって触媒強度が低下する、さらに極端な場合には担持粉体が担体から剥離する。アルコールなどの有機化合物を含むバインダーを使用する場合には、温度が高いと成型品に含まれる有機化合物が急激に蒸発して、周辺雰囲気が爆発範囲条件になる恐れもあるので、注意が必要である。一方、温度が低い場合には、アルコールなどのバインダーは蒸発するときに気化熱を奪い、成型品表面の温度が低下して、成型品表面に結露して表面の触媒活性成分が溶解する恐れがある。以上の理由から、成型品はできるだけ速やかに乾燥室あるいは乾燥装置に投入することが好ましく、成型工程終了後遅くとも25分以内に、好ましくは10分以内に乾燥室あるいは乾燥装置に投入したほうが良い。
尚、絶対湿度および相対湿度の測定には、例えば、株式会社山武(製)のネオセンサ室内形温度/湿度センサ(型番TY7043及びHY7043)やVAISALA(製)の温湿度計(型番HMT361)を使用できる。
メタクロレイン転化率(%)=100×(反応したメタクロレインのモル数)/(供給したメタクロレインのモル数) (2)
メタクリル酸選択率(%)=100×(生成したメタクリル酸モル数)/(反応したメタクロレインのモル数) (3)
メタクリル酸収率(%)=100×(生成したメタクリル酸モル数)/(供給したメタクロレインのモル数) (4)
純水7100mlに、三酸化モリブデン1000g、五酸化バナジウム44.23g、85%濃度の正燐酸水溶液88.11g、酸化銅11.05g、及び60%濃度の砒酸水溶液82.18gを投入し、92℃で3時間加熱攪拌してスラリーを調製した。その後、このスラリーを、25℃で相対湿度80.0%に調製した空気を導入しながら噴霧乾燥して、下記の組成を有する触媒粉末を得た。噴霧乾燥機の出口温度は100~110℃、得られた触媒粉末の粒径の中央値は75μm、含水率は9.1%であった。
Mo10P1.1V0.7Cu0.2As0.5であった(酸素含有量は酸化状態により変動するものなので特定できない)。
実施例1で調合したスラリーを、25℃で相対湿度72.0%に調整した空気を導入しながら噴霧乾燥して、下記の組成を有する触媒粉末を得た。噴霧乾燥機の出口温度は100~110℃、得られた触媒粉末の粒径の中央値は75μm、含水率は8.6%であった。Mo10P1.1V0.7Cu0.2As0.5であった(酸素含有量は酸化状態により変動するものなので特定できない)。
次いで、この顆粒320gと、セラミック繊維製の強度向上材55gとを均一に混合し、混合物を、球状多孔質アルミナ担体(平均粒径3.5mm)300gを用い、90%濃度のエタノール水溶液をバインダーとして75g使用して、温度29℃、絶対湿度0.020kg/kgDAの室内に設置した転動造粒機を使用して成型した。
実施例1で調合したスラリーを、15℃で相対湿度20.0%に調製した空気を導入しながら噴霧乾燥して、下記の組成を有する触媒粉末を得た。噴霧乾燥機の出口温度は100~110℃、得られた触媒粉末の粒径の中央値は75μm、含水率は7.5%であった。Mo10P1.1V1.2Cu0.2As0.3であった(酸素含有量は酸化状態により変動するものなので特定できない)。
成型を行う転動造粒機の室内温度及び絶対湿度を27℃、0.018kg/kgDA(相対湿度79.0%)、成型品を焼成炉へ投入する時の温度及び絶対湿度を、炉内温度50℃、絶対湿度0.015kg/kgDAに変更した以外は実施例2と同一設定条件で製造し、メタクリル酸製造用触媒を得た。得られた触媒の反応成績は、メタクロレイン転化率81.6%、メタクリル酸選択率81.6%、メタクリル酸収率66.6%であった。
成型を行う転動造粒機の室内温度及び絶対湿度を16℃、0.0055kg/kgDA、成型品を焼成炉へ投入する時の温度及び絶対湿度を、炉内温度50℃、絶対湿度0.017kg/kgDAに変更した以外は実施例2と同一設定条件で製造し、メタクリル酸製造用触媒を得た。得られた触媒の反応成績は、メタクロレイン転化率74.4%、メタクリル酸選択率82.9%、メタクリル酸収率61.7%であった。
成型品を乾燥及び焼成装置に投入する際の炉内温度50℃、絶対湿度0.013kg/kgDAに変更した以外は実施例3と同一設定条件で製造し、メタクリル酸製造用触媒を得た。得られた触媒の反応成績は、メタクロレイン転化率81.7%、メタクリル酸選択率79.8%、メタクリル酸収率65.3%であった。
なお、本出願は、2009年5月26日付で出願された日本特許出願(特願2009-126943)に基づいており、その全体が引用により援用される。また、ここに引用されるすべての参照は全体として取り込まれる。
Claims (7)
- モリブデン、リン、バナジウム及び銅を含むヘテロポリ酸を活性成分とする触媒成分粉末を担体にコーティングし、更にこれを焼成する、メタクリル酸製造用触媒の製造方法であって、
含水率が8.0~10.0重量%である触媒成分粉末を使用し、温度15~35℃、絶対湿度0.007~0.025kg/kgDAの雰囲気下で担体に該触媒成分粉末をコーティングする触媒成型工程と、
該触媒成型工程で成型した触媒を温度15~90℃、絶対湿度0.007~0.025kg/kgDAの雰囲気下の乾燥及び焼成装置に投入し、投入後30分以内に相対湿度10%以下になる温度まで昇温して焼成する焼成工程と、を有することを特徴とするメタクリル酸製造用触媒の製造方法。 - 加湿した空気を供給しながら触媒の成分を含有する化合物を含む水溶液または該化合物の水分散体を乾燥することにより、前記含水率が8.0~10.0重量%の触媒成分粉末を得る、請求項1に記載の製造方法。
- 前記触媒成型工程において、触媒成分粉末とともにバインダーを使用し、該バインダーとして、水及び1気圧下での沸点が150℃以下のアルコールのうち少なくとも1種類を使用する、請求項1または請求項2に記載の製造方法。
- 前記バインダーとして前記アルコールを使用し、該アルコール中のメチルアルコール又はエチルアルコール濃度が70重量%以上である、請求項3に記載の製造方法。
- 前記バインダーがエチルアルコールを含む、請求項3または請求項4に記載の製造方法。
- メタクリル酸製造用触媒の活性成分が一般式(I)
MoaPbVcCudXeOf (I)
(式中Mo、P、V、及びCuは、モリブデン、リン、バナジウム及び銅の各元素をそれぞれ表す。Xは、砒素、銀、ジルコニウム、ホウ素、ゲルマニウム、錫、鉛、クロム、ビスマス、コバルト、ニッケル、セリウム、タングステン、鉄、アルミニウム、マグネシウム、アンチモン及びチタンから選ばれる一種以上の元素を表す。Oは酸素元素を表す。元素記号右下の添字は各元素の原子比であり、a=10とした時、bは0.1以上6以下、cは0.3以上6以下、dは0.01以上5以下、eは0を含む5以下、fは各々の元素の酸化状態によって定まる数値である。)
で表される、請求項1~請求項5のいずれか一項に記載の触媒製造方法。 - 請求項1~請求項6のいずれか1項に記載の製造方法により製造された触媒の存在下で、メタクロレイン、イソブチレン、またはイソ酪酸を気相接触酸化することによるメタクリル酸の製造方法。
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| KR20160068763A (ko) | 2013-10-10 | 2016-06-15 | 닛뽄 가야쿠 가부시키가이샤 | 불포화 카본산의 제조 방법, 및 담지 촉매 |
| KR101511449B1 (ko) | 2013-11-28 | 2015-04-10 | 롯데케미칼 주식회사 | 메타아크롤레인 또는 메타아크릴산 제조용 촉매 제조방법 및 이를 이용하여 제조된 촉매 |
| CN103861640B (zh) * | 2014-03-13 | 2015-07-29 | 万华化学集团股份有限公司 | 一种杂多酸催化剂及其制备方法 |
| JP6452169B2 (ja) * | 2016-09-14 | 2019-01-16 | 日本化薬株式会社 | アクリル酸製造用触媒ならびにアクリル酸の製造方法 |
| JP6621055B2 (ja) | 2016-09-27 | 2019-12-18 | ブラザー工業株式会社 | 電子機器 |
| CN109985649B (zh) | 2018-01-02 | 2021-05-04 | 上海华谊新材料有限公司 | (甲基)丙烯醛氧化催化剂及其制备方法 |
| WO2019188955A1 (ja) | 2018-03-28 | 2019-10-03 | 日本化薬株式会社 | 不飽和カルボン酸製造用触媒 |
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| CN102652922B (zh) * | 2012-03-23 | 2013-09-04 | 太原理工大学 | 一种负载型磷钒铯镧催化剂及其应用 |
| CN113893879A (zh) * | 2021-11-04 | 2022-01-07 | 淄博市翔力致高新材料有限责任公司 | 一种杂多酸催化剂及其制备方法和用途 |
| CN113893879B (zh) * | 2021-11-04 | 2024-02-06 | 淄博市翔力致高新材料有限责任公司 | 一种杂多酸催化剂及其制备方法和用途 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2436443A4 (en) | 2014-01-08 |
| JP2012148202A (ja) | 2012-08-09 |
| JP5570142B2 (ja) | 2014-08-13 |
| CN102802790A (zh) | 2012-11-28 |
| EP2436443A1 (en) | 2012-04-04 |
| KR20120033313A (ko) | 2012-04-06 |
| RU2011152885A (ru) | 2013-07-10 |
| KR101711069B1 (ko) | 2017-02-28 |
| US8586785B2 (en) | 2013-11-19 |
| CN102802790B (zh) | 2014-07-30 |
| US20120065427A1 (en) | 2012-03-15 |
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