ATE189204T1 - Verfahren zur herstellung von cyclischen estern - Google Patents

Verfahren zur herstellung von cyclischen estern

Info

Publication number
ATE189204T1
ATE189204T1 AT94928095T AT94928095T ATE189204T1 AT E189204 T1 ATE189204 T1 AT E189204T1 AT 94928095 T AT94928095 T AT 94928095T AT 94928095 T AT94928095 T AT 94928095T AT E189204 T1 ATE189204 T1 AT E189204T1
Authority
AT
Austria
Prior art keywords
cyclic esters
starting materials
recovery
production
molecular weight
Prior art date
Application number
AT94928095T
Other languages
English (en)
Inventor
Dan W Verser
Timothy J Eggeman
William A Evanko
Kevin H Schilling
Manfred Meiser
Anthony E Allen
Melville E D Hillman
George E Cremeans
Edward S Lipinski
Alex Cheung
Original Assignee
Biopak Technology Ltd
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 Biopak Technology Ltd filed Critical Biopak Technology Ltd
Application granted granted Critical
Publication of ATE189204T1 publication Critical patent/ATE189204T1/de

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D319/00Heterocyclic compounds containing six-membered rings having two oxygen atoms as the only ring hetero atoms
    • C07D319/101,4-Dioxanes; Hydrogenated 1,4-dioxanes
    • C07D319/121,4-Dioxanes; Hydrogenated 1,4-dioxanes not condensed with other rings
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/42Separation; Purification; Stabilisation; Use of additives
    • C07C51/48Separation; Purification; Stabilisation; Use of additives by liquid-liquid treatment
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18Manufacture of films or sheets
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/04Polyesters derived from hydroxycarboxylic acids, e.g. lactones
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D167/00Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
    • C09D167/04Polyesters derived from hydroxycarboxylic acids, e.g. lactones
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/19Details relating to the geometry of the reactor
    • B01J2219/194Details relating to the geometry of the reactor round
    • B01J2219/1941Details relating to the geometry of the reactor round circular or disk-shaped
    • B01J2219/1942Details relating to the geometry of the reactor round circular or disk-shaped spherical
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/04Polyesters derived from hydroxy carboxylic acids, e.g. lactones
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/10Process efficiency

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Materials Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wood Science & Technology (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Heterocyclic Compounds That Contain Two Or More Ring Oxygen Atoms (AREA)
  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
AT94928095T 1993-09-29 1994-09-13 Verfahren zur herstellung von cyclischen estern ATE189204T1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/128,797 US5420304A (en) 1992-03-19 1993-09-29 Method to produce cyclic esters
PCT/US1994/010286 WO1995009142A1 (en) 1993-09-29 1994-09-13 Method to produce cyclic esters

Publications (1)

Publication Number Publication Date
ATE189204T1 true ATE189204T1 (de) 2000-02-15

Family

ID=22437018

Family Applications (1)

Application Number Title Priority Date Filing Date
AT94928095T ATE189204T1 (de) 1993-09-29 1994-09-13 Verfahren zur herstellung von cyclischen estern

Country Status (15)

Country Link
US (2) US5420304A (de)
EP (1) EP0722433B1 (de)
JP (1) JPH09502997A (de)
CN (1) CN1136309A (de)
AT (1) ATE189204T1 (de)
AU (1) AU7726794A (de)
BR (1) BR9407655A (de)
CA (1) CA2172798A1 (de)
DE (1) DE69422819D1 (de)
FI (1) FI961402A0 (de)
MY (1) MY113939A (de)
PH (1) PH30804A (de)
TW (1) TW321646B (de)
WO (1) WO1995009142A1 (de)
ZA (2) ZA947211B (de)

Families Citing this family (55)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0669151B1 (de) * 1994-02-24 2003-03-26 Matsushita Electric Industrial Co., Ltd. Verfahren zur Extraktion organischer Substanz, in diesem Verfahren zu verwendendes Lösungsmittel und Verfahren zur Messung des Gehaltes an organischer Substanz
US5856567A (en) * 1995-06-07 1999-01-05 Novus International, Inc. Continuous hydrolysis process for preparing 2-hydroxy-4-methylthiobutanioc acid or salts thereof
JPH11508876A (ja) 1995-06-07 1999-08-03 ノーバス インターナショナル インコーポレイテッド 2−ヒドロキシ−4−メチルチオブタン酸又はその塩を製造するための連続加水分解法
US5830991A (en) * 1996-02-09 1998-11-03 Kureha Kagaku Kagyo Kk Preparation process and purification process of dimeric cyclic ester of hydroxycarboxylic acid
US6475759B1 (en) * 1997-10-14 2002-11-05 Cargill, Inc. Low PH lactic acid fermentation
US6229046B1 (en) * 1997-10-14 2001-05-08 Cargill, Incorported Lactic acid processing methods arrangements and products
US6313319B1 (en) 1998-09-25 2001-11-06 Shimadzu Corporation Method for purifying lactide and lactide for food additives
US7074603B2 (en) * 1999-03-11 2006-07-11 Zeachem, Inc. Process for producing ethanol from corn dry milling
PL207932B1 (pl) 1999-03-11 2011-02-28 Zeachem Inc Sposób wytwarzania etanolu
IL132289A (en) * 1999-10-08 2003-12-10 Staley Mfg Co A E Process for conversion of an extracted carboxylic acid to a non-ionized product
NL1013682C2 (nl) * 1999-11-26 2001-05-30 Purac Biochem Bv Werkwijze en inrichting voor het zuiveren van een waterige oplossing van melkzuur.
FR2802923B1 (fr) * 1999-12-28 2002-03-08 Roquette Freres Procede de preparation d'une composition d'ester d'acide lactique et son utilisation en tant que solvant
US6509179B1 (en) 2000-10-12 2003-01-21 Barbara I. Veldhuis-Stribos Continuous process for preparing lactic acid
US6984293B2 (en) * 2001-03-15 2006-01-10 Tate & Lyle Ingredients Azeotropic distillation of cyclic esters of hydroxy organic acids
US6916959B2 (en) * 2001-05-11 2005-07-12 Nippon Shokubai Co., Ltd. Halogen-containing aromatic compound
EP1300387A1 (de) * 2001-10-05 2003-04-09 Haltermann GmbH Verfahren zum Herstellen von Estern einer Hydroxysäure
CN101157930A (zh) 2002-05-30 2008-04-09 卡吉尔道有限责任公司 在酵母中生产l-乳酸的方法与材料
PL2338895T3 (pl) 2003-05-02 2013-11-29 Cargill Inc Genetycznie modyfikowane gatunki drożdży i sposoby fermentacji z użyciem genetycznie modyfikowanych drożdży
MX306561B (es) * 2004-01-29 2013-01-09 Zeachem Inc Recuperacion de acidos organicos.
US7652167B2 (en) * 2004-07-19 2010-01-26 Board Of Trustees Of Michigan State University Process for production of organic acid esters
WO2006124899A2 (en) * 2005-05-13 2006-11-23 Cargill, Incorporated Production of derivatives of lactide, production of lactides, and use of lactide in foods and to produce polymers
AU2006291566A1 (en) 2005-06-02 2007-03-22 Cargill, Inc. Genetically modified yeast of the species issatchenkia orientalis and closely related species and fermentation processes using same
WO2007117282A2 (en) 2005-11-23 2007-10-18 Natureworks Llc Lactic acid-producing yeast cells having nonfunctional l-or d-lactate: ferricytochrome c oxidoreductase gene
CN100545159C (zh) * 2005-12-19 2009-09-30 奇美实业股份有限公司 α-羟基有机酸环酯类化合物的制造方法
PL2586313T3 (pl) 2006-03-13 2017-06-30 Cargill, Incorporated Sposób fermentacji przy użyciu komórek drożdży mających zaburzony szlak od fosforanu dihydroksyacetonu do glicerolu
EP2017347B1 (de) * 2006-03-29 2014-05-07 Bio-Energy Corporation Verfahren zur trennung von milchsäurekomponenten von milchsäurefermentationsbrühe und trennvorrichtung
DE102006055427A1 (de) * 2006-11-22 2008-05-29 Evonik Röhm Gmbh Verfahren zur Herstellung von Tetramethylglycolid
EP2121946A4 (de) * 2007-02-09 2012-08-29 Zeachem Inc Energieeffiziente verfahren zur herstellung von produkten
JP2008239601A (ja) * 2007-02-26 2008-10-09 Sumitomo Chemical Co Ltd ラクチド化合物の製造方法
EP2133346A1 (de) * 2008-06-12 2009-12-16 Ktanton Ltd Herstellungsverfahren eines zyklischen Diesters einer Alphahydroxylsäure (AHA)
KR101154029B1 (ko) 2009-05-20 2012-06-07 한국화학연구원 젖산에스테르로부터 락타이드의 직접 전환용 촉매 및 이를 이용한 락타이드의 제조방법
EP2407463A1 (de) 2010-07-14 2012-01-18 Solvay SA Verfahren zur Herstellung eines cyclischen Diesters einer alpha-Hydroxysäure
AR083614A1 (es) 2010-10-28 2013-03-06 Total Sa Uso de monascus en la produccion de acidos organicos
KR20130119945A (ko) 2010-11-22 2013-11-01 노보자임스 인코포레이티드 3-히드록시프로피온산 생산을 위한 조성물 및 방법
WO2012103261A2 (en) 2011-01-25 2012-08-02 Finley Kenneth R Compositions and methods for succinate production
US9011832B2 (en) 2012-02-09 2015-04-21 Novus International, Inc. Heteroatom containing cyclic dimers
CN107753462B (zh) 2012-07-12 2021-01-08 诺华丝国际股份有限公司 用于保护生物活性剂的基质和层组合物
BR112015001601A2 (pt) 2012-07-25 2017-11-07 Bioamber Sas células de levedura tendo curso de tca redutor de piruvato em succinato e superexpressão de uma enzima transidrogenase nad(p)+ exógena
ES2536294T3 (es) * 2012-10-26 2015-05-22 Uhde Inventa-Fischer Gmbh Procedimiento para preparar diésteres cíclicos, especialmente dilactida
CA2891130A1 (en) 2012-11-30 2014-06-05 Novozymes, Inc. 3-hydroxypropionic acid production by recombinant yeasts
DK3027733T3 (en) 2013-07-31 2018-12-10 Novozymes As Preparation of 3-Hydroxypropionic Acid in Recombinant Yeast Expressing an Insect Aspartate-1 Decarboxylase
US20170362613A1 (en) 2014-12-19 2017-12-21 Novozymes A/S Recombinant Host Cells For The Production Of 3-Hydroxypropionic Acid
EP3056490A1 (de) * 2015-02-13 2016-08-17 PURAC Biochem BV Verfahren zur Herstellung von Lactid
EP3262161B1 (de) 2015-02-27 2021-06-30 Novozymes A/S Mutante wirtszellen zur herstellung von 3-hydroxypropionsäure
EP3341475A1 (de) 2015-08-24 2018-07-04 Novozymes A/S Beta-alanin-aminotransferasen zur herstellung von 3-hydroxypropionsäure
KR102547252B1 (ko) * 2016-01-08 2023-06-23 에스케이이노베이션 주식회사 유기물질 기상탈수반응 원료의 제조방법
CN106397389B (zh) * 2016-09-07 2019-01-29 南京大学 一种合成乙交酯的工艺方法
CN106554342A (zh) * 2016-10-26 2017-04-05 中国地质大学(武汉) 3,6‑二氯甲基乙交酯及其制备方法和用途
CN110799523A (zh) 2017-05-12 2020-02-14 中外制药株式会社 用于制备环状有机化合物的方法
US10584306B2 (en) 2017-08-11 2020-03-10 Board Of Regents Of The University Of Oklahoma Surfactant microemulsions
CN112574165B (zh) * 2020-12-30 2022-01-07 安徽丰原生物技术股份有限公司 一步转化生成丙交酯的方法
CN113387921B (zh) * 2021-06-18 2022-08-19 华东理工大学 一种合成乙交酯的方法
EP4134365A1 (de) * 2021-08-12 2023-02-15 Sulzer Management AG Anlage und effizientes verfahren zur herstellung von lactid aus milchsäure
CN115028615B (zh) * 2022-07-27 2024-01-09 万华化学(四川)有限公司 一种l,l-丙交酯及其制备方法和应用
CN115417851A (zh) * 2022-08-30 2022-12-02 中国科学院长春应用化学研究所 一种乳酸直接制备丙交酯的方法

Family Cites Families (57)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE221786C (de) *
DE53074C (de) * Frau A. LA GUAYRA MAYO in Great Falls, Cty Cascade, und W. HUDNALL in Helena, Cty Lewisand Clark, V. St. A Verstellbare Säumvorrichtung für Nähmaschinen
CA863673A (en) * 1971-02-16 K. Schneider Allan Absorbable suture
DE267826C (de) * 1912-12-28 1913-12-02 Chemische Werke Verfahren zur Darstellung von lactid
US1095205A (en) * 1913-05-15 1914-05-05 Chemische Werke Vorm Dr Heinrich Byk Manufacture of lactid.
US1594843A (en) * 1921-08-19 1926-08-03 Du Pont Purification of lactic acid
US1906068A (en) * 1931-03-02 1933-04-25 Grasselli Chemical Co Lactic acid
US1995970A (en) * 1931-04-04 1935-03-26 Du Pont Polymeric lactide resin
US2163268A (en) * 1933-12-12 1939-06-20 Du Pont Method for making cyclic esters
US2174491A (en) * 1938-06-28 1939-09-26 Paul D Watson Method of making lactic acid resinous products
US2189572A (en) * 1938-09-01 1940-02-06 Paul D Watson Process for fractionating resinous products
US2703316A (en) * 1951-06-05 1955-03-01 Du Pont Polymers of high melting lactide
US2668162A (en) * 1952-03-20 1954-02-02 Du Pont Preparation of high molecular weight polyhydroxyacetic ester
US2758987A (en) * 1952-06-05 1956-08-14 Du Pont Optically active homopolymers containing but one antipodal species of an alpha-monohydroxy monocarboxylic acid
US2768973A (en) * 1954-11-30 1956-10-30 Du Pont Preparation of glycolaldehyde by hydrolysis of 4-chloro-2-oxodioxolane
US3322791A (en) * 1963-09-26 1967-05-30 Ethicon Inc Preparation of optically active lactides
DE1194142B (de) * 1963-11-19 1965-06-03 Bayer Ag Verfahren zum UV-Stabilisieren von Polycarbonaten
US3371112A (en) * 1964-12-18 1968-02-27 Allied Chem Purification of crude malic acid liquors
NL6516979A (de) * 1964-12-28 1966-06-29
DD53074A1 (de) * 1965-12-18 1967-01-05 Verfahren zur Herstellung cyclischer Esteranhydride von alpha-Hydroxycarbonsäuren
US3457280A (en) * 1967-06-12 1969-07-22 American Cyanamid Co Alpha-glycolide and methods for the isolation thereof
US3435008A (en) * 1967-08-22 1969-03-25 American Cyanamid Co Method for preparation of isomerically pure beta-glycolide and polymerization method for glycolide compositions employing partial hydrolyzate of said beta-glycolide
US3597450A (en) * 1969-11-05 1971-08-03 American Cyanamid Co Preparation of glycolide polymerizable into polyglycolic acid of consistently high molecular weight
US3867190A (en) * 1971-10-18 1975-02-18 American Cyanamid Co Reducing capillarity of polyglycolic acid sutures
US3736646A (en) * 1971-10-18 1973-06-05 American Cyanamid Co Method of attaching surgical needles to multifilament polyglycolic acid absorbable sutures
US3960152A (en) * 1974-01-21 1976-06-01 American Cyanamid Company Surgical sutures of unsymmetrically substituted 1,4-dioxane-2,5-diones
US4033938A (en) * 1974-01-21 1977-07-05 American Cyanamid Company Polymers of unsymmetrically substituted 1,4-dioxane-2,5-diones
US4045418A (en) * 1975-01-28 1977-08-30 Gulf Oil Corporation Copolymers of D,L-lactide and epsilon caprolactone
US4070375A (en) * 1976-08-05 1978-01-24 Chevron Research Company Process for preparing 1,4-dioxan-2-ones
US4435595A (en) * 1982-04-26 1984-03-06 Eastman Kodak Company Reactive distillation process for the production of methyl acetate
FR2583413B1 (fr) * 1985-06-14 1987-11-20 Rhone Poulenc Spec Chim Procede de preparation de trifluoroacetate de methyle.
US4727163A (en) * 1985-07-11 1988-02-23 E. I. Du Pont De Nemours And Company Process for preparing highly pure cyclic esters
US4650851A (en) * 1986-03-19 1987-03-17 Pfizer Hospital Products Group, Inc. Purification of glycolide
US4771001A (en) * 1986-03-27 1988-09-13 Neurex Corp. Production of lactic acid by continuous fermentation using an inexpensive raw material and a simplified method of lactic acid purification
DE3632103A1 (de) * 1986-09-20 1988-03-24 Boehringer Ingelheim Kg Verfahren zur herstellung von lactid
DE3708915C2 (de) * 1987-03-19 1996-04-04 Boehringer Ingelheim Kg Verfahren zur Herstellung von Lactid
EP0261572A1 (de) * 1986-09-20 1988-03-30 Boehringer Ingelheim Kg Verfahren zur Herstellung von Lactid
DE3778111D1 (de) * 1986-10-24 1992-05-14 Boehringer Ingelheim Kg Verfahren zur herstellung und reinigung thermolabiler verbindungen.
ATE79386T1 (de) * 1986-12-19 1992-08-15 Akzo Nv Herstellung von polymilchsaeure und copolymeren daraus.
US4835293A (en) * 1987-02-24 1989-05-30 E. I. Du Pont De Nemours And Company Atmospheric pressure process for preparing pure cyclic esters
NL8702563A (nl) * 1987-10-28 1989-05-16 Cca Biochem B V Polymeer lactide, werkwijze voor het bereiden van een dergelijk polymeer lactide, alsmede een samenstelling, die een dergelijk polymeer lactide bevat.
EP0339882A1 (de) * 1988-04-27 1989-11-02 MITSUI TOATSU CHEMICALS, Inc. Verfahren zur Herstellung von Lactide
US5274127A (en) * 1990-09-18 1993-12-28 Biopak Technology, Ltd. Lactide production from dehydration of aqueous lactic acid feed
US5319107A (en) * 1990-09-18 1994-06-07 Biopak Technology, Ltd. Method to produce cyclic esters
US5068418A (en) * 1989-05-08 1991-11-26 Uop Separation of lactic acid from fermentation broth with an anionic polymeric absorbent
US4939294A (en) * 1989-05-22 1990-07-03 Eastman Kodak Company Preparation of ultra high purity methyl acetate
US5075115A (en) * 1990-04-02 1991-12-24 Fmc Corporation Process for polymerizing poly(lactic acid)
AU7762291A (en) * 1990-05-03 1991-11-27 E.I. Du Pont De Nemours And Company Improved process for the rapid production of cyclic esters
US5043458A (en) * 1990-05-03 1991-08-27 E. I. Du Pont De Nemours And Company One-step continuous process for preparing cyclic esters
US5023349A (en) * 1990-05-08 1991-06-11 E. I. Du Pont De Nemours And Company Continuous process for rapid conversion of oligomers to cyclic esters
US5091544A (en) * 1990-05-08 1992-02-25 E. I. Du Pont De Nemours And Company Process for rapid conversion of oligomers to cyclic esters
US5023350A (en) * 1990-05-24 1991-06-11 E. I. Du Pont De Nemours And Company Process for the purification of cyclic esters
US5138074A (en) * 1990-06-28 1992-08-11 E. I. Du Pont De Nemours And Company Continuous catalyzed vapor phase dimeric cyclic ester process
US5089632A (en) * 1991-01-30 1992-02-18 E. I. Du Pont De Nemours And Company Process for preparing cyclic esters using a fluorocarbon
US5236560A (en) * 1992-03-13 1993-08-17 E. I. Du Pont De Nemours And Company Solventless dimeric cyclic ester distillation process
US5264592A (en) * 1992-09-08 1993-11-23 Camelot Technologies Inc. Lactide melt recrystallization
US5310599A (en) * 1993-05-06 1994-05-10 E. I. Du Pont De Nemours And Company Method for making polymers of alpha-hydroxy acids

Also Published As

Publication number Publication date
MY113939A (en) 2002-06-29
EP0722433A1 (de) 1996-07-24
ZA961426B (en) 1996-06-18
FI961402A (fi) 1996-03-27
DE69422819D1 (de) 2000-03-02
TW321646B (de) 1997-12-01
US5420304A (en) 1995-05-30
PH30804A (en) 1997-10-17
BR9407655A (pt) 1997-01-28
AU7726794A (en) 1995-04-18
EP0722433B1 (de) 2000-01-26
CA2172798A1 (en) 1995-04-06
US5750732A (en) 1998-05-12
EP0722433A4 (de) 1996-07-31
FI961402A0 (fi) 1996-03-27
JPH09502997A (ja) 1997-03-25
CN1136309A (zh) 1996-11-20
WO1995009142A1 (en) 1995-04-06
ZA947211B (en) 1996-06-18

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