EP4594367A1 - Verfahren zur herstellung eines copolymers ausgehend von mindestens einer aromatischen vinylverbindung - Google Patents
Verfahren zur herstellung eines copolymers ausgehend von mindestens einer aromatischen vinylverbindungInfo
- Publication number
- EP4594367A1 EP4594367A1 EP23777297.5A EP23777297A EP4594367A1 EP 4594367 A1 EP4594367 A1 EP 4594367A1 EP 23777297 A EP23777297 A EP 23777297A EP 4594367 A1 EP4594367 A1 EP 4594367A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- condensate
- heat exchanger
- vapor stream
- point
- column
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F212/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
- C08F212/02—Monomers containing only one unsaturated aliphatic radical
- C08F212/04—Monomers containing only one unsaturated aliphatic radical containing one ring
- C08F212/06—Hydrocarbons
- C08F212/08—Styrene
- C08F212/10—Styrene with nitriles
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/01—Processes of polymerisation characterised by special features of the polymerisation apparatus used
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/04—Polymerisation in solution
- C08F2/06—Organic solvent
Definitions
- the invention relates to a process for producing a copolymer starting from at least one aromatic compound, in particular styrene and/or alpha-methylstyrene, and at least one further monomer from the group consisting of acrylonitrile and methacrylate, wherein the process comprises the polymerization of the at least one aromatic vinyl compound and the at least one further monomer in at least one reactor in the presence of at least one organic solvent, the separation of volatile components to obtain a vapor stream and the condensation of at least parts of the vapor stream.
- the invention further relates to a device for carrying out the process.
- Vapors can contain, for example, aromatic vinyl monomer such as styrene or alpha-methylstyrene, vinyl cyanide monomer such as acrylonitrile, methacrylate monomer such as methyl methacrylate MMA and/or organic solvent such as ethylbenzene, but also water vapor, especially in small amounts, as volatile components.
- aromatic vinyl monomer such as styrene or alpha-methylstyrene
- vinyl cyanide monomer such as acrylonitrile
- methacrylate monomer such as methyl methacrylate MMA
- organic solvent such as ethylbenzene
- the resulting copolymers such as styrene-acrylonitrile copolymers (SAN copolymers), particularly alpha-methylstyrene-acrylonitrile copolymers (AMSAN copolymers) and/or styrene-methyl methacrylate copolymers (SMMA copolymers), have excellent formability, rigidity and durability and retain these even when exposed to weather conditions.
- SAN copolymers styrene-acrylonitrile copolymers
- AMSAN copolymers alpha-methylstyrene-acrylonitrile copolymers
- SMMA copolymers styrene-methyl methacrylate copolymers
- a copolymer of an aromatic vinyl compound and a vinyl cyanide compound and/or methacrylate is typically produced by reacting the monomers into a an organic solvent.
- the polymerization product initially contains unreacted monomers and organic solvent, which must preferably be removed in an environmentally friendly manner.
- the copolymerization can be carried out in one or more reactors.
- the polymerization product obtained is transferred to an evaporation tank, which can also be referred to as a degassing tank, and volatile components such as residual monomers and organic solvent are separated off. The condensation of the separated volatile components takes place using coolers. Furthermore, purification is carried out in order to obtain the copolymer end product in the highest possible yield.
- EP 3 689 923 B1 describes a process for producing a polymer from an aromatic vinyl compound and a vinyl cyanide compound. A freshly added organic solvent is sprayed onto separated volatile components. The separation of volatile components from the product mixture, which contains polymer, residual monomers and organic solvent, takes place using an evaporation tank and by condensing the separated volatile components in one or two condensers connected in series. Improved condensation can be achieved by increasing the pressure and reducing the cooling temperature.
- EP 3 689 923 B1 lists installation restrictions as limits when lowering the temperature of a supplied refrigerant in the condensation, which leads to the expulsion of non-condensed volatile components from the process.
- the condensation efficiency is reduced as the amount of low boiling point vinyl cyanide monomers is increased.
- Uncondensed volatiles are released into the environment or atmosphere through a wastewater treatment system using a water-powered liquid ring pump. The more the amount of non-condensed volatile components can be reduced, the lower the effort required for wastewater treatment or the amount of emissions.
- US 4,555,384 discloses a process and apparatus for continuous bulk polymerization of styrene and alkenylnitrile monomers. Steam containing monomers is taken directly from the polymerization reactor and fed to a condenser.
- EP 3 689 919 A1 relates to the preparation of a polymer from an aromatic vinyl compound and a vinyl cyanide compound, wherein an evaporated part of the reaction mixture is also led from the reactor into a condenser.
- the task is to provide an energy-efficient and low-emission process and a corresponding device in which, in particular, the separation and disposal of condensed vapors and, if applicable, waste water can be avoided.
- a higher temperature of the coolant can be compensated for by a larger area for heat transfer.
- larger heat exchangers can be used or the improvement in condensation efficiency can be achieved or replaced by injecting evaporating liquids.
- reducing the temperature can prevent the system from becoming blocked by polymerization of the resulting condensate, especially if it does not contain an inhibitor, since polymerization generally occurs more quickly at higher temperatures. Accordingly, a lower temperature in the system is advantageous with regard to blockage. This is achieved by recirculating the condensate and the associated early cooling of the vapor stream.
- the invention relates to a process for producing a copolymer starting from at least one aromatic vinyl compound, in particular styrene and/or alpha-methylstyrene, and at least one further monomer from the group consisting of acrylonitrile and methacrylate, the process comprising the following steps: a) polymerization the at least one aromatic vinyl compound and the at least one further monomer in at least one reactor in the presence of at least one organic solvent, wherein a polymerization product is obtained, the copolymer, residual monomers, which contains at least one organic solvent and optionally oligomers, b) separation of volatile components from the polymerization product obtained in step a), the separation being carried out in a degassing container at a negative pressure of 1 to 150 mbar absolute, in particular from 10 to 100 mbar absolute, and the polymerization product is heated in a first heat exchanger and the first heat exchanger with a first media inlet temperature of more than 200 ° C, in particular in a range from 220
- the invention also relates to an apparatus for carrying out the process according to the invention, comprising a reactor, a first heat exchanger, a degassing vessel, optionally a column with a column headspace, a second heat exchanger with a gas outlet and a liquid outlet, a third heat exchanger, these being connected in series downstream in the specified order, the third heat exchanger having an inlet space and a collection space and preferably being arranged vertically, the liquid outlet of the second heat exchanger and/or the collection space of the third heat exchanger being connected to the inlet space of the third heat exchanger via a first condensate line, optionally the liquid outlet of the second heat exchanger and/or the collection space of the third heat exchanger being connected to the column head space of the column via a second condensate line and optionally the liquid outlet of the second heat exchanger and/or the collection space of the third heat exchanger being connected to a vapor line which connects the degassing vessel to the column via a third condensate line.
- the process or device according to the invention enables the condensation of the vapor stream, i.e. the volatile components from the polymerization product, to be carried out more economically and with lower emissions. Furthermore, if a column is used, fewer monomers and solvents are discharged via the oligomers obtained and separated during the condensation. The amount of monomers and solvent discharged can be further reduced by at least partially recycling the condensate.
- the volatile components By recirculating the condensate, which in turn evaporates through contact with the hot volatile components, the volatile components are cooled before the actual condensation takes place, so that the cooling capacity still to be provided by the heat exchangers is reduced and at the same time the condensation efficiency is increased.
- step a) the at least one aromatic vinyl compound and the at least one further monomer are present in the at least one organic solvent and are polymerized in the at least one reactor so that the polymerization product is formed.
- the polymerization product contains the copolymer, residual monomers, the at least one organic solvent and optionally oligomers.
- it is fed to the degassing vessel via the first heat exchanger in which the polymerization product is heated.
- the media temperature refers to the temperature in the inlet of the heating or cooling medium of the respective heat exchanger.
- the polymerization product is heated by a heating medium.
- the first, second heat exchanger and the third heat exchanger are used for cooling; a cooling medium is fed to each of them.
- the volatile components such as unreacted monomers, solvents or oligomers are preferably partially evaporated, so that the first heat exchanger can also be referred to as a partial evaporator.
- the polymerization product is preferably present at a reactor temperature in a range from 105°C to 180°C, more preferably in a range from 105°C to 125°C or in a range from 140°C to 180°C.
- the polymerization product is preferably heated in the first heat exchanger to a temperature in a range from 180 ° C to 270 ° C.
- the first heat exchanger is arranged on the degassing vessel and forms a structural unit in particular with the degassing vessel.
- the first heat exchanger can be arranged separately from the degassing vessel.
- a vacuum system which is preferably arranged downstream of the degassing vessel, more preferably downstream of the third heat exchanger, a negative pressure in the system, in particular the degassing vessel, into which the polymerization product including the volatile components enters from the first heat exchanger.
- the copolymer is separated from the volatile components.
- a phase containing the copolymer, which forms the lower phase in the degassing vessel, is discharged.
- a gaseous phase which contains the volatile components and is referred to as vapor or vapor stream, is discharged from the degassing vessel, in particular above the phase containing the copolymer.
- the vapor stream is in particular gaseous.
- the amount of gaseous vapor that reaches the vacuum system can be controlled via the third media inlet temperature at the third heat exchanger.
- the vapor stream preferably contains the aromatic vinyl compound, in particular aromatic vinyl monomer such as styrene and/or alpha-methylstyrene, the at least one further monomer, in particular vinyl cyanide monomer such as acrylonitrile, methacrylate monomer such as MMA, oligomers and/or organic solvent such as ethylbenzene , toluene and/or methyl ethyl ketone (MEK), and optionally water, in particular water vapor.
- a solution which is fed to the first heat exchanger and from which the vapor stream is formed preferably contains 1 to 5,000 ppm of water.
- the stream referred to in the invention as vapor stream B varies in terms of quantity and composition as the process steps described are carried out.
- the copolymer produced preferably includes SAN copolymers, AMSAN copolymers and/or SMMA copolymers.
- the vapor stream is condensed in several stages.
- the vapor stream is preferably condensed first in the second heat exchanger and then in the third heat exchanger.
- the brother stream is further cooled, which also counteracts polymerization and thus blockage of the pipes and, in particular, achieves as complete a condensation as possible.
- the vapor stream is passed through a separation unit, in particular a column, before the second heat exchanger, in which the vapor stream is brought into contact with the first condensate and/or the second condensate, oligomers being removed from the vapor stream.
- a separation unit in particular a column
- the second heat exchanger in which the vapor stream is brought into contact with the first condensate and/or the second condensate, oligomers being removed from the vapor stream.
- the second heat exchanger is preceded by a column which can have internals.
- the first condensate and/or the second condensate are preferably fed to the column in the upper part, in particular at the top.
- the bottom of the column is preferably heated, in particular to a temperature in a range from 150 ° C to 280 ° C. Oligomers that have been condensed out of the vapor stream are preferably collected in the bottom.
- the remaining vapor stream is preferably removed at the top of the column and fed to the second heat exchanger. Liquid from the bottom of the column can be recycled, in particular for further depletion of monomers and solvents, and in particular can be fed in together with the first condensate and/or the second condensate at the first point.
- first element such as a heat exchanger or a column
- second element such as another heat exchanger
- a first condensate is formed in the second heat exchanger, while the remaining gaseous vapor stream is led into the third heat exchanger, where a second condensate is formed.
- the first condensate and/or the second condensate are returned at least into the third heat exchanger and additionally or alternatively, in particular additionally, further upstream of the second heat exchanger and brought into contact with the vapor stream.
- the first condensate and/or the second condensate are returned, in particular injected, into the column and/or into a vapor line between the degassing vessel and the column.
- the negative pressure in the degassing vessel is generated by means of a vacuum system, which is arranged in particular downstream of the at least one further heat exchanger.
- the vacuum system is preferably designed as a liquid ring pump system and is further preferably operated with a liquid, wherein the liquid comprises in particular an organic mixture, preferably consisting of the organic mixture, and in particular the liquid contains 10 to 90 wt.% of the at least one aromatic vinyl compound, in particular styrene and/or alpha-methylstyrene, 5 to 50 wt.% of the at least one further monomer and 0.5 to 50 wt.% of the organic solvent, in particular ethylbenzene, based on the total liquid in the vacuum system.
- Styrene and/or alpha-methylstyrene is preferably added to the liquid.
- the vacuum that can be achieved via the liquid ring pump system i.e. the minimum absolute pressure that can be achieved, is given by the vapor pressure of the liquid used.
- the presence of styrene and/or For example, alpha-methylstyrene in the liquid can lower the vapor pressure compared to acrylonitrile. The higher the proportion of styrene and/or alpha-methylstyrene in the liquid, the lower the minimum absolute pressure that can be achieved.
- the vacuum system in particular has a liquid ring pump liquid circuit with a liquid separator and overflow.
- the vacuum system preferably includes the liquid ring pump system, a jet pump, the liquid ring pump liquid circuit with the liquid separator and the overflow, the fourth heat exchanger and the exhaust gas heat exchanger.
- the vacuum system is preferably fluidly connected to the collecting space of the third heat exchanger.
- the vacuum system preferably comprises at least one pump, which is designed as a liquid ring pump system, an overflow and a pump heat exchanger, and the pump heat exchanger is preferably arranged downstream on the high-pressure side of the pump and connected to the low-pressure side of the pump via a return line.
- a supply line is preferably arranged between the overflow and the pump heat exchanger, via which the liquid is added to the vacuum system, in particular to the liquid ring pump system.
- the vacuum system is preferably arranged downstream of the third heat exchanger.
- the vacuum system supplies the negative pressure in particular in the first heat exchanger, the degassing vessel, if applicable the column, the second heat exchanger and the third heat exchanger.
- the negative pressure in the degassing container is generated by means of a vacuum system, which is arranged in particular downstream of the second heat exchanger and the third heat exchanger.
- the vacuum system preferably comprises at least one pump, which is designed as a liquid ring pump system and is operated with a liquid which is separated on the pressure side of the pump from an exhaust gas which is taken from the pump by means of a liquid separator and fed to the pump.
- the pump which is also referred to as a vacuum pump, can be preceded by a jet pump, which is also referred to as an ejector, in order to enable the pressure in the system part to be further reduced up to the degassing container.
- At least parts of the first condensate and/or the second condensate are preferably supplied to the liquid of the liquid ring pump system. More preferably, the at least one aromatic vinyl compound A is added to the liquid.
- the condensation efficiency can be slightly reduced compared to adding solvent to the vapor stream, according to EP 3 689 923 B1, and the amount of non-condensed vapors at the inlet of the vacuum system can therefore be increased. This can be compensated for by using a liquid in the liquid ring pump system that contains at least one aromatic vinyl compound. The non-condensed vapors can still be condensed in the vacuum system and returned to the reactor.
- volatile components that were not condensed in the liquid can be condensed via an exhaust gas heat exchanger in the vacuum system and returned to the reactor.
- the exhaust gas heat exchanger is preferably operated at a higher pressure than the second heat exchanger and/or the third heat exchanger.
- the exhaust gas heat exchanger is operated at a pressure of more than 900 mbar. Therefore, the condensation efficiency of the exhaust gas heat exchanger is high, so that almost no gaseous vapors escape into the exhaust gas.
- the liquid separator preferably has an overflow. More preferably, liquid that passes through the overflow is removed from the vacuum system and, in particular, returned to the reactor.
- a portion of the at least one aromatic vinyl compound is added to the liquid, wherein the at least one aromatic vinyl compound is present in particular in a mixture with an inhibitor, and the amount of aromatic vinyl compound added to the liquid is at least 10% by weight, more preferably at least 20% by weight of a gaseous portion of the vapor stream which is fed to the vacuum system.
- the content of inhibitor, in particular dissolved in the at least one aromatic vinyl compound, is preferably 1 to 50 ppm, based on the mixture of aromatic vinyl compound and inhibitor in the vacuum system.
- the liquid is preferably cooled in a pump heat exchanger, which is also referred to as a fourth heat exchanger. More preferably, the portion of the at least one aromatic vinyl compound is added to the liquid before the pump heat exchanger.
- the pump heat exchanger is preferably operated with a fourth media inlet temperature T4. More preferably, the fourth media inlet temperature T4 is smaller than the second media inlet temperature T2 of the second heat exchanger. In particular, a difference between the second media inlet temperature T2 and the fourth media inlet temperature T4 is at least 10 ° C.
- the exhaust gas from the vacuum system is preferably at least partially condensed in the exhaust gas heat exchanger, which is also referred to as the fifth heat exchanger, more preferably at ambient pressure, in particular at a pressure of more than 900 mbar.
- the exhaust gas heat exchanger is preferably operated with a fifth media inlet temperature T5, more preferably the fifth media inlet temperature T5 is smaller than the second media inlet temperature T2 of the second heat exchanger.
- a difference between the second media inlet temperature T2 and the fifth media inlet temperature T5 is at least 10 ° C. Due to the lower temperature at the exhaust gas heat exchanger, components that have left the second heat exchanger in the gaseous state can still be condensed downstream of the second heat exchanger. In the second heat exchanger, not all components necessarily have to be condensed, so that the second heat exchanger can be operated with a warmer coolant such as river water.
- the first condensate and/or the second condensate are brought into contact with the vapor stream in cocurrent at a first point in front of the column, the first condensate and the second condensate are brought into contact with the vapor stream in countercurrent at a second point in the column and / or the first condensate and / or the second condensate are brought into direct contact with the vapor stream at a third point in the third heat exchanger.
- the vapor stream is cooled before entering the column, so that fewer deposits, i.e. a lower extent of polymerization, occur in the column.
- first condensate and/or the second condensate at the second location leads to further separation of oligomers from the condensate.
- the return of the first condensate and/or the second condensate at the third location serves in particular to cool condensate from the first buffer tank.
- the vapor stream is cooled by supplying the first condensate and/or the second condensate at the first point, wherein the temperature difference in the vapor stream before and after the first point is at least 25°C and the vapor stream after the first point has a temperature of at least 120°C.
- the vapor stream is preferably cooled by supplying the first condensate and/or the second condensate at the second point, the vapor stream more preferably after the second point has a temperature in a range from 65 ° C to 190 ° C.
- At least one buffer tank can be arranged, which can also be referred to as a storage tank.
- the first condensate and/or the second condensate are preferably collected in one or more buffer tanks, with water, in particular from the first condensate and/or the second condensate, optionally being separated in at least one buffer tank.
- At least one of the one or more buffer tanks preferably comprises a water separator.
- the vapor stream When removed from the degassing container, the vapor stream preferably contains 10 to 90% by weight, in particular 25 to 65% by weight, of at least one aromatic vinyl compound, in particular styrene, in 5 to 60% by weight, in particular 10 to 40% by weight .-%, the at least one further monomer, in particular acrylonitrile, and 0.5 to 50% by weight, in particular 25 to 45% by weight, of the organic solvent, in particular ethylbenzene, toluene and / or MEK, in each case based on the entire vapor stream.
- the organic solvent in particular ethylbenzene, toluene and / or MEK
- an inhibitor can be added.
- An inhibitor is preferably added to the first condensate and/or the second condensate, in particular before the third heat exchanger.
- the inhibitor is preferably supplied to the third heat exchanger together with the first condensate and/or the second condensate.
- the inhibitor, in particular dissolved in the at least one aromatic vinyl compound, is preferably added in an amount of 1 to 20 ppm, based on the vapor stream that is taken from the degassing container.
- the inhibitor preferably contains or consists of 4-ter-butylcatechol (TBC), alkoxyphenol such as 4-methoxyphenol (MEHQ) and/or, in particular sterically hindered, thiophenol such as 4-hydroxy-2,2,6,6-tetramethylpiperidinyloxyl (4- Hydroxy TEMPO).
- TBC 4-ter-butylcatechol
- MEHQ 4-methoxyphenol
- thiophenol such as 4-hydroxy-2,2,6,6-tetramethylpiperidinyloxyl (4- Hydroxy TEMPO).
- the sum of the amounts of the first condensate and the second condensate which are returned at the at least one location and the further location, in particular at the first location, the second location and the third location, is at least 50% by weight, based on the vapor stream which is removed from the degassing vessel.
- the first condensate and/or the second condensate are fed to the first location in a total amount of up to 40% by weight, based on the vapor stream taken from the degassing vessel.
- the first condensate and/or the second condensate are preferably fed to the column, in particular to the second location, in a total amount of up to 150 wt.%, based on the vapor stream taken from the degassing vessel. If more than 100 wt.% is returned, the condensate is recirculated several times.
- the first condensate and/or the second condensate are injected into a vapor line at at least one point, in particular upstream of the column.
- the first heat exchanger, the second heat exchanger and the third heat exchanger are preferably designed as tube bundle heat exchangers.
- the first heat exchanger is preferably arranged vertically.
- the second heat exchanger is preferably arranged horizontally.
- the third heat exchanger is preferably arranged vertically.
- a vertical arrangement is understood to mean that in the direction of gravity there is first an inlet space, then a heat exchange surface, in particular a tube bundle, and then a collecting space.
- the inlet space is preferably a head space and the collecting space is preferably a sump space.
- tubes of the first heat exchanger and/or the third heat exchanger are aligned in the direction of gravity.
- the tubes, in particular of the second heat exchanger are arranged perpendicular to the direction of gravity.
- the first condensate and/or the second condensate are preferably injected into the head region of the third heat exchanger, in particular in the flow direction of the vapor stream.
- Water is preferably used as the medium in the second heat exchanger.
- the medium used in the third heat exchanger is preferably brine and/or water containing glycol.
- the medium in the second heat exchanger and in the third heat exchanger is preferably a cooling medium.
- the second heat exchanger is preferably operated with river water or a coolant that is provided by cooling through river water.
- the river water is preferably used in a secondary circuit.
- the medium in the first heat exchanger is in particular a heating medium.
- Diphyl steam such as Therminol VP1 or a heating fluid, in particular a heating oil, is preferably used as the medium in the first heat exchanger.
- the heating oil is preferably selected from mineral oils or synthetic oils, which are known to the person skilled in the art, for example as Therminol T66, T62, T55, T72 or Melatherm SH.
- Figure 1 is a schematic representation of a first embodiment of the invention
- Figure 2 is a schematic representation of a second embodiment of the invention.
- Figure 3 is a schematic representation of a third embodiment of the invention.
- Figure 1 shows a schematic representation of a first embodiment of the invention.
- An aromatic vinyl compound A, at least one further monomer M and an organic solvent L are fed to a reactor R.
- a polymerization product PP is formed which comprises a copolymer CP and the organic solvent L.
- the polymerization product PP is first fed to a first heat exchanger WT1, where the polymerization product PP is heated with a heating medium that has a first media inlet temperature T1.
- the heated polymerization product PP passes from the first heat exchanger WT1 into a degassing vessel EB, from which the copolymer CP and a gaseous vapor stream B containing volatile components are removed.
- the vapor stream B is led from the degassing vessel EB via a vapor line BL into a column K with a column headspace KKR, which has internals E. Oligomers OL are removed from the bottom of the column K, which is heated with a heating jacket H. From the top of the column K, the remaining vapor stream B is transferred further into a second heat exchanger WT2, where the vapor stream B is partially condensed with a coolant that has a second media inlet temperature T2, so that a first condensate KS1 is removed from the second heat exchanger WT2 at a liquid outlet FLA.
- the first condensate KS1 is temporarily stored in a first buffer tank PB1.
- the remaining gaseous vapor stream B passes from the second heat exchanger WT2 from a gas outlet GA into a third heat exchanger WT3, where it is further condensed by means of a further coolant with a third media inlet temperature T3.
- the second heat exchanger WT2 is arranged horizontally, while the third heat exchanger WT3 is arranged vertically.
- a second condensate KS2 is taken from the third heat exchanger WT3 from a sump space SR and fed to a second buffer container PB2. Water W is separated in the second buffer container PB2.
- the second buffer container PB2 is filled hydraulically, an upper phase flows over the top of the second buffer container PB2 into a third buffer container PB3.
- a vacuum system VA is also connected to the sump chamber SR of the third heat exchanger WT3.
- This system is operated with a liquid F and comprises a vacuum pump VP and a liquid separator FA with an overflow U.
- the vacuum pump VP is designed as a liquid ring pump.
- the liquid F is cooled in a fourth heat exchanger WT4.
- An exhaust gas AG from the vacuum system VA is condensed in a fifth heat exchanger WT5 in order to reduce gaseous emissions from the process.
- Buffer is stored in the third buffer tank PB3 to compensate for fluctuations in throughput.
- the first condensate KS1 from the heat exchanger WT2 is injected into the vapor stream B at a first point ED1 in the vapor line BL in front of the column K.
- the vapor stream B is already cooled before it enters the column K.
- the first condensate KS1 from the second heat exchanger WT2 is introduced into the top of the column K at a second point ED2 and brought into contact with the vapor stream B here in order to separate the oligomers OL.
- the first condensate KS1 is injected at a third location ED3 in a headspace KR of the third heat exchanger WT3 in order to further cool the vapor stream B and obtain the second condensate KS2.
- the second condensate KS2 and the mixture from the third buffer tank PB3 can be partially added to the first condensate KS1 for recirculation at the first point ED1, the second point ED2 or the third point ED3.
- the mixture collected in the third buffer tank PB3 is returned to the reactor R by a pump and, if necessary, by another buffer tank in order to convert remaining unreacted monomers to the copolymer CP. Pumps P are used to convey the condensates KS1, KS2.
- FIG. 2 shows schematically a second embodiment of the invention.
- the vapor stream B is supplied to the second heat exchanger WT2 directly from the degassing container EB, so there is no column K here.
- the first condensate KS1 is injected from the second heat exchanger WT2 into the head space KR of the third heat exchanger WT3 in order to cool the condensate as much as possible, and the second condensate KS2 is, if necessary, returned to the reactor R via a further buffer container.
- Inhibitor can be added when returning to the third heat exchanger WT3.
- FIG. 3 shows a schematic representation of a third embodiment of the invention.
- the vapor stream B is fed to the second heat exchanger WT2 via a column K and from the second heat exchanger WT2 is passed on into a third heat exchanger WT3.
- the second heat exchanger WT2 and the third heat exchanger WT3 are arranged horizontally in this exemplary embodiment.
- the first condensate KS1 from the second heat exchanger WT2 and the second condensate KS2 from the third heat exchanger WT3 are mixed in a second buffer tank PB2 and partly fed at a first point ED1 into the vapor stream B in the vapor line BL upstream of the column K and at a second point ED2 at the top of the column K.
- the warmer first condensate KS1 is mixed with the cold second condensate KS2 in the second buffer tank PB2.
- a total feed stream of 4.3 t/h was fed to the reactor.
- 2.47 t/h of copolymer and 1.83 t/h of vapor were removed.
- the polymer contained 1.6 to 2 t/h of styrene and 0.47 to 0.87 t/h of acrylonitrile. In each case, a polymer with 65 wt.% styrene and 35 wt.% acrylonitrile was produced.
- the vapor stream was taken from the degassing vessel at a temperature of 260°C. Before the column, the vapor stream was brought into contact with 200 l/h of the first condensate, whereby the mixture was injected into the vapor line so that the feed stream into the column had a total temperature of 225°C. The bottom of column K was heated to 250°C.
- the pressure at the top of the column was 53 mbar.
- the vapor stream was taken from the top of the column at a temperature of 160 °C and fed to the second heat exchanger, where it was partially condensed with a coolant with a second media inlet temperature T2 of 19 to 25 °C.
- the second media temperature was 30 °C when leaving the second heat exchanger.
- 2.86 t/h of first condensate were taken from the second heat exchanger and the remaining vapor stream was fed to the third heat exchanger at a temperature of 30 °C.
- the first condensate had a temperature of 47 °C.
- the fourth heat exchanger WT4 and the fifth heat exchanger WT5 were operated with a coolant inlet temperature of 7 ° C. Only traces of monomers or solvents were detectable in the exhaust gas from the fifth heat exchanger WT5. There was no wastewater to be disposed of.
- Example 2 The process was carried out essentially as in Example 1, but instead of the first condensate, the vapor stream was brought into contact with 200 l/h of ethylbenzene as organic solvent L in front of the column. This led to an increase in the fill level in the buffer tank in front of the reactor, so that after 12 hours around 6 t of the mixture had to be separated and disposed of.
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Abstract
Description
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Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP22198792 | 2022-09-29 | ||
| PCT/EP2023/076772 WO2024068772A1 (de) | 2022-09-29 | 2023-09-27 | Verfahren zur herstellung eines copolymers ausgehend von mindestens einer aromatischen vinylverbindung |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4594367A1 true EP4594367A1 (de) | 2025-08-06 |
Family
ID=84044353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23777297.5A Pending EP4594367A1 (de) | 2022-09-29 | 2023-09-27 | Verfahren zur herstellung eines copolymers ausgehend von mindestens einer aromatischen vinylverbindung |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4594367A1 (de) |
| KR (1) | KR20250078459A (de) |
| CN (1) | CN119968402A (de) |
| WO (1) | WO2024068772A1 (de) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2724360C3 (de) * | 1977-05-28 | 1988-03-24 | Bayer Ag, 5090 Leverkusen | Verfahren zur Herstellung von thermoplastischen Formmassen auf Basis von Vinylpolymerisaten |
| US4555384A (en) | 1982-09-24 | 1985-11-26 | Cosden Technology, Inc. | Apparatus for producing styrenic/alkenylnitrile copolymers |
| DE10015862A1 (de) * | 2000-03-30 | 2001-10-11 | Bayer Ag | Polyamidzusammensetzung und Verfahren zu ihrer Herstellung |
| JP5602249B2 (ja) * | 2010-01-14 | 2014-10-08 | エクソンモービル・ケミカル・パテンツ・インク | 連続的溶液重合のための方法および装置 |
| KR102435545B1 (ko) | 2018-12-18 | 2022-08-24 | 주식회사 엘지화학 | 방향족 비닐 화합물-비닐시안 화합물 중합체의 제조방법 및 제조장치 |
| KR102421977B1 (ko) | 2018-12-19 | 2022-07-18 | 주식회사 엘지화학 | 방향족 비닐 화합물-비닐시안 화합물 중합체의 제조방법 및 제조장치 |
-
2023
- 2023-09-27 WO PCT/EP2023/076772 patent/WO2024068772A1/de not_active Ceased
- 2023-09-27 KR KR1020257010763A patent/KR20250078459A/ko active Pending
- 2023-09-27 CN CN202380069796.3A patent/CN119968402A/zh active Pending
- 2023-09-27 EP EP23777297.5A patent/EP4594367A1/de active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024068772A1 (de) | 2024-04-04 |
| KR20250078459A (ko) | 2025-06-02 |
| CN119968402A (zh) | 2025-05-09 |
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