US20090114523A1 - Method for treating condensates form polycodensates - Google Patents

Method for treating condensates form polycodensates Download PDF

Info

Publication number
US20090114523A1
US20090114523A1 US11/918,636 US91863606A US2009114523A1 US 20090114523 A1 US20090114523 A1 US 20090114523A1 US 91863606 A US91863606 A US 91863606A US 2009114523 A1 US2009114523 A1 US 2009114523A1
Authority
US
United States
Prior art keywords
products
condensation
stage
condenser
condensates
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.)
Abandoned
Application number
US11/918,636
Other languages
English (en)
Inventor
Rudolf Kampf
Andreas Karpf
Rainer Linke
Oliver Schmidt
Gerhard Scholz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lurgi Zimmer GmbH
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Assigned to LURGI ZIMMER GMBH reassignment LURGI ZIMMER GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SCHOLZ, GERHARD, SCHMIDT, OLIVER, LINKE, RAINER, KARPE, ANDREAS, KAMPF, RUDOLF
Assigned to LURGI ZIMMER GMBH reassignment LURGI ZIMMER GMBH CORRECTIVE ASSIGNMENT TO CORRECT THE SPELLING OF THE LAST NAME OF THE 2ND ASSIGNOR & A WORD IN THE STREET ADDRESS OF THE ASSIGNEE. PREVIOUSLY RECORDED ON REEL 022123 FRAME 0469. ASSIGNOR(S) HEREBY CONFIRMS THE SPELLING OF THE LAST NAME OF THE 2ND ASSIGNOR IS: KARPF; THE STREET IS: LURGIALLEE 5. Assignors: SCHOLZ, GERHARD, SCHMIDT, OLIVER, LINKE, RAINER, KARPF, ANDREAS, KAMPF, RUDOLF
Publication of US20090114523A1 publication Critical patent/US20090114523A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G64/00—Macromolecular compounds obtained by reactions forming a carbonic ester link in the main chain of the macromolecule
    • C08G64/20—General preparatory processes
    • C08G64/30—General preparatory processes using carbonates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/78—Preparation processes
    • C08G63/785—Preparation processes characterised by the apparatus used
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/14—Fractional distillation or use of a fractionation or rectification column
    • B01D3/143—Fractional distillation or use of a fractionation or rectification column by two or more of a fractionation, separation or rectification step
    • B01D3/148—Fractional distillation or use of a fractionation or rectification column by two or more of a fractionation, separation or rectification step in combination with at least one evaporator
    • 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
    • B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G64/00—Macromolecular compounds obtained by reactions forming a carbonic ester link in the main chain of the macromolecule
    • C08G64/20—General preparatory processes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
    • C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
    • C08G63/16—Dicarboxylic acids and dihydroxy compounds
    • C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
    • C08G63/19—Hydroxy compounds containing aromatic rings

Definitions

  • the invention relates to a method of treating vapors and condensates that are produced during the production of polycondensates from bisphenols or polyhydric phenols by esterification and/or transesterification with alkyl and/or aryl esters of at least divalent organic or inorganic acids.
  • polycarbonates, polyarylates, and copolymers of polyethylene terephthalate, polypropylene terephthalate, or polybutylene terephthalate can be prepared by esterification and/or transesterification of alkyl or aryl esters of organic or inorganic, at least divalent acids with bisphenols and subsequent interfacial polycondensation or melt polycondensation.
  • These polycondensates are known as engineering plastics for their outstanding properties.
  • the water or other vapors released during condensation contain, apart from the main cleavage product from the transesterification or esterification that is preferably phenol, additional monomers, oligomers, or products that are produced through thermal decomposition or rearrangements.
  • the decomposition or rearrangement products formed in the reaction contaminate the monomers and oligomers also still present in the vapors and make it impossible to return the monomers and oligomers unpurified to the polycondensation process when products that are not discolored and that do not sufficiently meet rheological and mechanical quality requirements are to be produced.
  • the cleavage products produced by the polycondensation such as phenols, alcohols, and water, are also so contaminated by the mentioned decomposition and rearrangement products that they cannot be easily reused.
  • reaction products arising during thermal decomposition interfere with the reutilization of phenols present in the vapors, for example, for the production of bisphenol A, diphenyl carbonate, triphenyl borate, or for any other phenyl ester of an organic or inorganic acid.
  • the object arose to develop a method of treating vapors and condensates that are produced during the production of the above-described polycondensates, the method making it possible, on the one hand, to recover the entrained monomers and to return them to the polycondensation and, on the other, to produce the cleavage products arising in the polycondensation, primarily phenol, in such a pure form that they can be reused for other reactions without deterioration in the product quality.
  • a method for treating vapors and condensates that are produced during the production of polycondensates from bisphenols or polyhydric phenols by esterification or transesterification with alkyl or aryl esters of at least divalent organic or inorganic acids the method in which the treatment occurs in several succeeding cascaded condensers and/or distillation columns with respective connected condensers, where in each condenser the dew point and pressure are established such that in the individual stages the specific monomers, oligomers, or the decomposition and rearrangement products are separated.
  • This method enables the return of useful materials to the process, is especially economical and cost-effective, avoids environmental pollution by chemicals, and utilizes the inevitably forming by-products to generate energy.
  • This method can be used especially well for the regeneration of phenol-containing vapors and condensates and for the recovery of monomers, as they arise, for example, in the production of polycarbonates, polyarylates, or in the melt-phase polycondensation of polymers and copolymers, such as polyethylene terephthalate, polypropylene terephthalate, or polybutylene terephthalate with diphenols and bisphenols or polyhydric phenols by esterification or transesterification with alkyl or aryl esters of organic or inorganic, at least divalent acids and/or the acids themselves.
  • polycondensates are known as engineering plastics with outstanding properties and special fields of application. Their production occurs either by interfacial polycondensation as in the case of polycarbonate or by means of melt polycondensation in the direct polycondensation method from dicarboxylic acids or dialcohols or diphenols or by transesterification processes from the corresponding acid esters.
  • aromatic dihydroxy compounds for example, bis(4-hydroxyphenyl)alkanes, particularly bisphenol A
  • diphenyl carbonate or terephthalic diphenolate in the presence of catalysts with cleavage of phenols, oligomerized, and finally polymerized in multiple stages under a progressive vacuum.
  • Methods of this type are described in the German patent publications DE-B-1 495 730 [U.S. Pat. No. 3,535,280] and DE-C-2 334 852 [U.S. Pat. No. 3,888,826].
  • the international patent application WO 2002/044244 [U.S. Pat. No.
  • 6,838,543 describes a method by which polycarbonates are prepared by reaction of a monomeric carbonate component with at least one diphenol or dialcohol in the presence of a transesterification catalyst; here, the melted components are mixed with the transesterification catalyst and a product is produced that is polycondensed.
  • the transesterification product is passed through a preliminary reactor, at least one intermediate reactor, and a final reactor, the reactors being connected in series and having a substantially horizontally driven shaft with mixing elements attached thereto.
  • cleavage products 5 primarily phenol
  • the distillate forming hereby is conveyed to a condenser 6 whose temperature is kept above the dew point of the cleavage products and that of monomers 1 and 2 , for example at a temperature above 200° C. and at 400 mbar.
  • a condenser 6 whose temperature is kept above the dew point of the cleavage products and that of monomers 1 and 2 , for example at a temperature above 200° C. and at 400 mbar.
  • high-boiling products 7 of the secondary reactions and present in vapors 5 of the first stage such as spiroidanes and indanes, can be separated out.
  • the vapors continuing onward then pass through a rectification column 8 in which the lowest boiling cleavage products are stripped off at the top, but monomers 1 and 2 are drained off at different trays and returned to the first reaction stage 4 .
  • the low-boiling cleavage product 10 is condensed in a condenser 11 and taken to a collection tank 28 .
  • the first compressor stage 12 that, as indicated in FIG. 1 , may consist of a mechanical blower 12 , but also a jet exhaust, serves for generating the necessary low pressure.
  • the condensates accumulating in the compression stage 12 in condenser 29 proceed to a collection tank 27 .
  • the amount of low-boiling cleavage products 15 is even lower.
  • more drastic measures such as a higher temperature and lower pressure than in stage 1 , are necessary to drive the reaction or the chain growth forward, thus, for example, 270 to 300° C. and 100 hPa to 10 hPa.
  • the products from secondary reactions appear increasingly in the vapor gas stream 16 ; as a result, the amount of this product type, accumulating in condenser 6 ′, is also greater than in previous stage 4 .
  • the condensate 7 accumulating in 6 ′, proceeds to a collection tank 24 .
  • the amount of monomers 1 and 2 in the cleavage products has become so low that a separation is no longer worthwhile and everything is condensed in condenser 8 ′, before the lowest-boiling vapors are compressed in a compressor 16 .
  • the vapors condensed in condenser 17 from the compressor 16 are combined with the stream 10 and taken to the collection tank 28 .
  • Condensate 9 is supplied to the rectification stage 8 to increase the yield of monomers 1 and 2 and the cleavage products 10 .
  • the lowest amount of cleavage products 20 accumulates.
  • the most drastic measures such as the highest temperature and lowest pressure, are necessary to drive the reaction or the chain growth forward, thus, for example, 280 to 350° C. and 10 hPa to 0.1 hPa.
  • the products in the secondary reaction occupy a large portion in the vapor gas stream 20 ; as a result, the amount accumulating in condenser 6 ′′ is also much higher than in the previous stages.
  • the condensate 7 accumulating in 6 ′′ goes to collection tank 24 .
  • the amount of monomers 1 and 2 in the cleavage products has become so low that a separation is no longer worthwhile and, for this reason, everything is condensed in condenser 8 ′′.
  • the vapors condensed in condenser 22 from compression 21 are supplied as compressor condensate 22 to the collection tank 26 .
  • the decision is made on the remaining amount of condensate 9 ′ after analysis in quality control (QC) whether it can still be supplied to rectification 8 to increase the yield of monomers 1 and 2 and cleavage products 10 , or is taken to collection tank 25 for special treatment according to FIG. 2 .
  • the products collected in the tanks 24 to 28 are the results of a coarse fractionation or preliminary fractionation by selective choosing of the reaction and/or condensation conditions. They represent the first stage of an overall process that leads to an optimal and economic utilization of the monomers and cleavage products.
  • the product from collection tank 24 has a high concentration of by-products, such as, for example, trisphenols, polymeric isopropenylphenols, dihydroxyindanes, dihydroxyspirobisindanes, alkyldistilbestrols, and polyhydroxyaryls, and only a minor effort is required to recover reusable products such as the monomers or cleavage product.
  • Vapors 33 containing useful materials go to the top and proceed to rectification 34 , where they are rectified with product 9 and/or 9 ′ that stems from the middle fraction collected in collection tank 25 .
  • a fraction each of monomers 1 and 2 is obtained from the lower trays; after passing quality control (QC), these are again taken either directly after purification by crystallization 41 , 43 and/or zone-melt process 42 , 44 as pure monomer 1 and/or 2 to the first stage with reactor 4 .
  • the bottoms of stage 34 contain only high boilers, which proceed to incineration 32 .
  • Product 35 escaping to the top of column 34 is rich in low-boiling cleavage products and enters the middle portion of column 36 , into which the main portion of the cleavage product from collection tanks 27 and 28 is also introduced.
  • Pure cleavage product 37 , passing to the top, is recovered, which after condensation 39 is returned via return tank 40 and quality control (QC) either to column 36 or as the end product 45 is used for further reuse, for example, for the preparation of acid esters or of bisphenol A with acetone.
  • the recovered product 45 meets the quality criteria of a product from the monomer synthesis.
  • Quality control (QC) decides about the remaining bottom product 38 that is either again allocated to column 34 or to incineration 32 as waste.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Polyesters Or Polycarbonates (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Closing And Opening Devices For Wings, And Checks For Wings (AREA)
US11/918,636 2004-05-15 2006-02-27 Method for treating condensates form polycodensates Abandoned US20090114523A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102005017427.2 2005-04-15
DE102005017427A DE102005017427A1 (de) 2005-04-15 2005-04-15 Verfahren zur Aufbereitung von Kondensaten aus der Polykondensation
PCT/EP2006/001772 WO2006108469A1 (de) 2005-04-15 2006-02-27 Verfahren zur aufbereitung von kondensaten aus der polykondensation

Publications (1)

Publication Number Publication Date
US20090114523A1 true US20090114523A1 (en) 2009-05-07

Family

ID=36581737

Family Applications (2)

Application Number Title Priority Date Filing Date
US11/918,636 Abandoned US20090114523A1 (en) 2004-05-15 2006-02-27 Method for treating condensates form polycodensates
US12/268,516 Active 2030-03-22 US8029079B2 (en) 2005-04-15 2008-11-11 Safety cabinet

Family Applications After (1)

Application Number Title Priority Date Filing Date
US12/268,516 Active 2030-03-22 US8029079B2 (en) 2005-04-15 2008-11-11 Safety cabinet

Country Status (7)

Country Link
US (2) US20090114523A1 (https=)
EP (1) EP1869102A1 (https=)
JP (1) JP2008535980A (https=)
KR (1) KR20080015406A (https=)
CN (1) CN101160341A (https=)
DE (1) DE102005017427A1 (https=)
WO (1) WO2006108469A1 (https=)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5110238B2 (ja) * 2004-05-11 2012-12-26 Ｊｓｒ株式会社 絶縁膜形成用組成物およびその製造方法、ならびにシリカ系絶縁膜およびその形成方法
US7946665B2 (en) * 2008-11-11 2011-05-24 Dueperthal Sicherheitstechnik GmbH Safety cabinet with multipanel folding door
CN102126958B (zh) * 2010-12-30 2013-12-04 江苏淮河化工有限公司 精馏与结晶耦合制备高纯度间（对）硝基甲苯的装置及方法
US8727459B2 (en) * 2011-07-08 2014-05-20 SSI Schäfer Noell GmbH Lager- und Systemtechnik Multiple-door switchgear cabinet
DE102012105296A1 (de) * 2012-06-19 2013-12-19 Epc Engineering Consulting Gmbh Verfahren und Anlage zur Herstellung von Polycarbonat
DE102013210180A1 (de) * 2013-05-31 2014-12-04 Aquafil Engineering Gmbh Verfahren zur Aufarbeitung eines bei Polykondensationsprozessen anfallenden Gemisches und eine Anlage zur Durchführung des Verfahrens
CN104109101B (zh) * 2013-06-06 2016-12-28 上海志诚化工有限公司 一种半导体用超纯电子级化学试剂纯化装置
US9243437B1 (en) * 2013-10-30 2016-01-26 Austin Hardware And Supply, Inc. Door sequencer
USD797475S1 (en) * 2016-06-23 2017-09-19 Cosmocube, Inc. Cabinet

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3167531A (en) * 1962-01-24 1965-01-26 Monsanto Co Continuous process for the manufacture of bis(2-hydroxyethyl) terephthalate and low molecular weight polymers thereof
US3535280A (en) * 1963-07-24 1970-10-20 Bayer Ag Condensing of polycarbonates in wiped thin-film reactor
US3888826A (en) * 1972-07-10 1975-06-10 Mitsubishi Gas Chemical Co Process for preparing aromatic polycarbonates
US4008048A (en) * 1973-07-06 1977-02-15 Agfa-Gevaert N.V. Installation for the discontinuous production of polyethylene terephthalate
US4294994A (en) * 1980-04-21 1981-10-13 General Electric Company Purification of bisphenol-A
US6380345B1 (en) * 1999-01-06 2002-04-30 Teijin Limited Process for producing polycarbonates
US6838543B2 (en) * 2000-12-01 2005-01-04 Zimmer Ag Method for producing polycarbonates

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2820514A (en) 1955-08-26 1958-01-21 John P Travis Folding flue window
US3516198A (en) * 1969-01-21 1970-06-23 Robert J Lyons Emergency release latch mechanism for smoke hatch
JPS5036877B2 (https=) 1972-04-24 1975-11-28
US4262448A (en) * 1979-06-20 1981-04-21 Justrite Manufacturing Company Safety storage cabinet
US4619076A (en) * 1985-04-15 1986-10-28 Justrite Manufacturing Company Safety cabinet latching system
US5061022A (en) * 1990-06-11 1991-10-29 The Louis Berkman Company Door closing mechanism
US5722202A (en) * 1996-04-26 1998-03-03 Safe-T-Way Sequential door closing mechanism
US5944399A (en) * 1998-07-06 1999-08-31 Eagle Manufacturing Company Safety cabinet with self-closing and sequencing door mechanism
US5992098A (en) * 1998-12-09 1999-11-30 Justrite Manufacturing Company, Llc Safety cabinet latching system
EP1081174B1 (en) * 1999-03-03 2005-05-11 Ube Industries, Ltd. Process for producing polycarbonate
US6729701B2 (en) * 2001-06-29 2004-05-04 Justrite Manufacturing Company Llc Safety cabinet
DE10316656B8 (de) 2003-04-11 2004-09-16 Asecos Gmbh Sicherheit Und Umweltschutz Sicherheitsschrank
DE202004004855U1 (de) 2004-03-25 2004-08-12 Asecos Gmbh Sicherheitsschrank
DE102004021912A1 (de) 2004-03-25 2005-10-13 Asecos Gmbh Sicherheitsschrank

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3167531A (en) * 1962-01-24 1965-01-26 Monsanto Co Continuous process for the manufacture of bis(2-hydroxyethyl) terephthalate and low molecular weight polymers thereof
US3535280A (en) * 1963-07-24 1970-10-20 Bayer Ag Condensing of polycarbonates in wiped thin-film reactor
US3888826A (en) * 1972-07-10 1975-06-10 Mitsubishi Gas Chemical Co Process for preparing aromatic polycarbonates
US4008048A (en) * 1973-07-06 1977-02-15 Agfa-Gevaert N.V. Installation for the discontinuous production of polyethylene terephthalate
US4294994A (en) * 1980-04-21 1981-10-13 General Electric Company Purification of bisphenol-A
US6380345B1 (en) * 1999-01-06 2002-04-30 Teijin Limited Process for producing polycarbonates
US6838543B2 (en) * 2000-12-01 2005-01-04 Zimmer Ag Method for producing polycarbonates

Also Published As

Publication number Publication date
KR20080015406A (ko) 2008-02-19
CN101160341A (zh) 2008-04-09
JP2008535980A (ja) 2008-09-04
US20090134756A1 (en) 2009-05-28
WO2006108469A1 (de) 2006-10-19
US8029079B2 (en) 2011-10-04
DE102005017427A1 (de) 2006-10-19
EP1869102A1 (de) 2007-12-26

Similar Documents

Publication Publication Date Title
CA1072978A (en) Process and apparatus for the production of oligomeric alkylene benzene dicarboxylates
KR102931177B1 (ko) 디에스테르를 포함하는 단량체 혼합물로부터의 테레프탈레이트 폴리에스테르의 제조 방법
KR101995617B1 (ko) 폴리카보네이트 생산 방법 및 설비
TW574257B (en) A process for producing polycarbonate
JP4074250B2 (ja) ポリトリメチレンテレフタレートの製造法
US20090114523A1 (en) Method for treating condensates form polycodensates
EP1265944B1 (de) Verfahren zur herstellung von hochreinem polycarbonat
KR20250003796A (ko) 폴리락트산 탈휘발화로부터 얻은 락타이드를 사용하여 폴리락트산을 생성하기 위한 플랜트 및 효율적인 방법
CN1125106C (zh) 从对苯二甲酸和丁二醇连续制备聚对苯二甲酸丁二醇酯的方法
US4319017A (en) Semi or fully continuous process for polyester of bisphenol and dicarboxylic acid by transesterification polymerization and product thereof
JPH07196582A (ja) スクラップの芳香族ポリカーボネートから有用なビスヒドロキシ芳香族有機化合物とビスアリールカーボネートを回収する方法
KR20070089923A (ko) 폴리카보네이트의 제조 방법
US7317073B2 (en) Method of producing vacuum in the production of polymers
JP3426318B2 (ja) 廃芳香族ポリカーボネート樹脂のリサイクル方法
JP2002105185A (ja) ポリエステルの製造方法
EP4359397A1 (en) A plant and an efficient process for producing lactide from lactic acid
CN119452016A (zh) 用于生产聚乳酸的设备及高效方法
RU2854972C2 (ru) Реакторы и их специальная конструкция, подходящие для установки получения поликарбоната, обладающей высокой эксплуатационной гибкостью и надёжностью, в частности, с использованием технологии предварительной переэтерификации
EP4650381A1 (en) A flexible and economical process and plant for producing polylactic acid
JP2003171324A (ja) 芳香族ポリカーボネートのケミカルリサイクル方法
RU2816663C2 (ru) Способ получения полиэфиртерефталата, включающий процесс деполимеризации
WO2025061258A1 (en) Process and apparatus for increasing the flexibility and robustness of a polycarbonate plant by means of a pre-transesterification-reaction technology
JP5938992B2 (ja) ポリカーボネート樹脂の製造方法
DE10052873A1 (de) Verfahren zur Herstellung von Polycarbonat und Produkten daraus

Legal Events

Date Code Title Description
AS Assignment

Owner name: LURGI ZIMMER GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KAMPF, RUDOLF;KARPE, ANDREAS;LINKE, RAINER;AND OTHERS;REEL/FRAME:022123/0469;SIGNING DATES FROM 20071102 TO 20071209

AS Assignment

Owner name: LURGI ZIMMER GMBH, GERMANY

Free format text: CORRECTIVE ASSIGNMENT TO CORRECT THE SPELLING OF THE LAST NAME OF THE 2ND ASSIGNOR & A WORD IN THE STREET ADDRESS OF THE ASSIGNEE. PREVIOUSLY RECORDED ON REEL 022123 FRAME 0469;ASSIGNORS:KAMPF, RUDOLF;KARPF, ANDREAS;LINKE, RAINER;AND OTHERS;REEL/FRAME:022365/0828;SIGNING DATES FROM 20071102 TO 20071209

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION