ZA961426B - Method to produce cyclic esters - Google Patents

Method to produce cyclic esters

Info

Publication number
ZA961426B
ZA961426B ZA961426A ZA961426A ZA961426B ZA 961426 B ZA961426 B ZA 961426B ZA 961426 A ZA961426 A ZA 961426A ZA 961426 A ZA961426 A ZA 961426A ZA 961426 B ZA961426 B ZA 961426B
Authority
ZA
South Africa
Prior art keywords
cyclic esters
starting materials
recovery
production
molecular weight
Prior art date
Application number
ZA961426A
Other languages
English (en)
Inventor
Dan W Verser
Alex Cheung
Timothy J Eggeman
William A Evanko
Kevin H Schilling
Manfred Meiser
Anthony E Allen
Melville E D Hillman
George E Cremeans
Edwards S Lipinsky
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
Publication of ZA961426B publication Critical patent/ZA961426B/xx

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D319/00—Heterocyclic compounds containing six-membered rings having two oxygen atoms as the only ring hetero atoms
    • C07D319/10—1,4-Dioxanes; Hydrogenated 1,4-dioxanes
    • C07D319/12—1,4-Dioxanes; Hydrogenated 1,4-dioxanes not condensed with other rings
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/42—Separation; Purification; Stabilisation; Use of additives
    • C07C51/48—Separation; Purification; Stabilisation; Use of additives by liquid-liquid treatment
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/04—Polyesters derived from hydroxycarboxylic acids, e.g. lactones
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING 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
    • C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
    • C09D167/04—Polyesters derived from hydroxycarboxylic acids, e.g. lactones
    • 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
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/19—Details relating to the geometry of the reactor
    • B01J2219/194—Details relating to the geometry of the reactor round
    • B01J2219/1941—Details relating to the geometry of the reactor round circular or disk-shaped
    • B01J2219/1942—Details relating to the geometry of the reactor round circular or disk-shaped spherical
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Health & Medical Sciences (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Life Sciences & Earth Sciences (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)
ZA961426A 1993-09-29 1994-09-16 Method to produce cyclic esters ZA961426B (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
ZA961426B true ZA961426B (en) 1996-06-18

Family

ID=22437018

Family Applications (2)

Application Number Title Priority Date Filing Date
ZA961426A ZA961426B (en) 1993-09-29 1994-09-16 Method to produce cyclic esters
ZA947211A ZA947211B (en) 1993-09-29 1994-09-16 Method to produce cyclic esters

Family Applications After (1)

Application Number Title Priority Date Filing Date
ZA947211A ZA947211B (en) 1993-09-29 1994-09-16 Method to produce cyclic esters

Country Status (15)

Country Link
US (2) US5420304A (fr)
EP (1) EP0722433B1 (fr)
JP (1) JPH09502997A (fr)
CN (1) CN1136309A (fr)
AT (1) ATE189204T1 (fr)
AU (1) AU7726794A (fr)
BR (1) BR9407655A (fr)
CA (1) CA2172798A1 (fr)
DE (1) DE69422819D1 (fr)
FI (1) FI961402A (fr)
MY (1) MY113939A (fr)
PH (1) PH30804A (fr)
TW (1) TW321646B (fr)
WO (1) WO1995009142A1 (fr)
ZA (2) ZA961426B (fr)

Families Citing this family (56)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0669151B1 (fr) * 1994-02-24 2003-03-26 Matsushita Electric Industrial Co., Ltd. Méthode d'extraction de substance organique, solvant pour utilisation dans ladite méthode et méthode de mesure de la teneur en substance organique
US5856567A (en) * 1995-06-07 1999-01-05 Novus International, Inc. Continuous hydrolysis process for preparing 2-hydroxy-4-methylthiobutanioc acid or salts thereof
DE69615183T2 (de) 1995-06-07 2002-05-29 Novus Int Inc Kontinuerliches hydrolyse-verfahren zur herstellung von 2-hydroxy-4-methylthiobutansäure oder salze davon
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
PL203207B1 (pl) * 1999-03-11 2009-09-30 Zeachem Inc Sposób wytwarzania etanolu
US7074603B2 (en) * 1999-03-11 2006-07-11 Zeachem, Inc. Process for producing ethanol from corn dry milling
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 (fr) * 2001-10-05 2003-04-09 Haltermann GmbH Procédé de préparation d'esters d'acides hydroxy carboxyliques
US7232664B2 (en) 2002-05-30 2007-06-19 Natureworks Llc Fermentation process using specific oxygen uptake rates as a process control
CN1922198B (zh) 2003-05-02 2012-07-11 卡吉尔公司 基因修饰酵母物种和使用基因修饰酵母的发酵方法
JP5013879B2 (ja) * 2004-01-29 2012-08-29 ズィーケム インコーポレイテッド 有機酸の回収
US7652167B2 (en) * 2004-07-19 2010-01-26 Board Of Trustees Of Michigan State University Process for production of organic acid esters
WO2006124899A2 (fr) * 2005-05-13 2006-11-23 Cargill, Incorporated Production de derives de la lactide et utilisation de la lactide dans des produits alimentaires et pour produire des polymeres
EP1885842A4 (fr) 2005-06-02 2009-06-10 Cargill Inc Levure génétiquement modifiée de l'espèce issatchenkiaorientalis et espèce étroitement liée et processus de fermentation les utilisant
JP5121070B2 (ja) 2005-11-23 2013-01-16 ネイチャーワークス・エル・エル・シー Ｌ−又はｄ−ラクタート：フェリチトクロームｃ酸化還元酵素遺伝子が機能しない乳酸産生酵母
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
DK2586313T3 (en) 2006-03-13 2017-03-27 Cargill Inc Fermentation process using yeast cells with interrupted conversion pathway from dihydroxyacetone phosphate to glycerol
WO2007114017A1 (fr) 2006-03-29 2007-10-11 Bio-Energy Corporation Procédé pour la séparation d'un composant de l'acide lactique d'une liqueur de fermentation lactique et appareil de séparation
DE102006055427A1 (de) * 2006-11-22 2008-05-29 Evonik Röhm Gmbh Verfahren zur Herstellung von Tetramethylglycolid
EP2121946A4 (fr) * 2007-02-09 2012-08-29 Zeachem Inc Procédés à efficacité énergique destinés à produire des produits
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 (fr) * 2008-06-12 2009-12-16 Ktanton Ltd Procédé pour la fabrication d'un diester cyclique d'un acide alpha-hydroxylé
KR101154029B1 (ko) 2009-05-20 2012-06-07 한국화학연구원 젖산에스테르로부터 락타이드의 직접 전환용 촉매 및 이를 이용한 락타이드의 제조방법
EP2407463A1 (fr) 2010-07-14 2012-01-18 Solvay SA Procédé de fabrication d'un diester cyclique d'un alpha-hydroxyacide
US9809831B2 (en) 2010-10-28 2017-11-07 Total Research & Technology Feluy Monascus strains modified for organic acid production
CN107828671B (zh) 2010-11-22 2022-03-08 卡吉尔公司 用于生产3-羟基丙酸的组合物和方法
US9605285B2 (en) 2011-01-25 2017-03-28 Cargill, Incorporated Compositions and methods for succinate production
EP2812372B1 (fr) 2012-02-09 2018-09-26 Novus International Inc. Hétéroatomes contenant des dimères cycliques
US9452143B2 (en) 2012-07-12 2016-09-27 Novus International, Inc. Matrix and layer compositions for protection of bioactives
EP3901248A1 (fr) 2012-07-25 2021-10-27 Cargill, Incorporated Cellules de levure ayant une voie tca réductrice à partir du pyruvate vers succinate et surexprimant une enzyme nad(p)+ transhydrogénase exogène
ES2536294T3 (es) * 2012-10-26 2015-05-22 Uhde Inventa-Fischer Gmbh Procedimiento para preparar diésteres cíclicos, especialmente dilactida
BR112015012409A2 (pt) 2012-11-30 2017-09-12 Novozymes Inc célula recombinante de levedura, e, método de produção de 3-hp
EP3027733B1 (fr) 2013-07-31 2018-09-12 Novozymes A/S Production d'acide 3-hydroxypropionique par des levures recombinantes exprimant une aspartate 1-décarboxylase d'insecte
WO2016100910A1 (fr) 2014-12-19 2016-06-23 Novozymes A/S Cellules hôtes de recombinaison pour la production d'acide 3-hydroxypropionique
EP3056490A1 (fr) * 2015-02-13 2016-08-17 PURAC Biochem BV Procédé de fabrication de lactide
EP3262161B1 (fr) 2015-02-27 2021-06-30 Novozymes A/S Cellules hôtes de recombinaison pour la production d'acide 3-hydroxypropionique
EP3341475A1 (fr) 2015-08-24 2018-07-04 Novozymes A/S Bêta-alanine aminotransférases pour la production d'acide 3-hydroxypropionique
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
KR20200007863A (ko) 2017-05-12 2020-01-22 추가이 세이야쿠 가부시키가이샤 환상 유기 화합물의 제조 방법
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 (fr) * 2021-08-12 2023-02-15 Sulzer Management AG Installation et procédé efficace de production de lactide à partir d'acide lactique
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
EP4389740A1 (fr) * 2022-12-21 2024-06-26 Röhm GmbH Tétraméthylglycolid polymérisable

Family Cites Families (57)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE221786C (fr) *
CA863673A (en) * 1971-02-16 K. Schneider Allan Absorbable suture
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
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
BE674355A (fr) * 1964-12-28 1966-06-27
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
US3736646A (en) * 1971-10-18 1973-06-05 American Cyanamid Co Method of attaching surgical needles to multifilament polyglycolic acid absorbable sutures
US3867190A (en) * 1971-10-18 1975-02-18 American Cyanamid Co Reducing capillarity of polyglycolic acid sutures
US4033938A (en) * 1974-01-21 1977-07-05 American Cyanamid Company Polymers of unsymmetrically substituted 1,4-dioxane-2,5-diones
US3960152A (en) * 1974-01-21 1976-06-01 American Cyanamid Company Surgical sutures 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
EP0261572A1 (fr) * 1986-09-20 1988-03-30 Boehringer Ingelheim Kg Procédé de production de lactide
DE3708915C2 (de) * 1987-03-19 1996-04-04 Boehringer Ingelheim Kg Verfahren zur Herstellung von Lactid
ES2030409T3 (es) * 1986-10-24 1992-11-01 Boehringer Ingelheim Kg Procedimiento para preparar y purificar compuestos termolabiles .
ES2052551T3 (es) * 1986-12-19 1994-07-16 Akzo Nv Metodo para preparar poli(acido lactico) o copolimeros de poli(acido lactico) por polimeracion de la lactida.
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 (fr) * 1988-04-27 1989-11-02 MITSUI TOATSU CHEMICALS, Inc. Procédé de production de lactide
US5319107A (en) * 1990-09-18 1994-06-07 Biopak Technology, Ltd. Method to produce cyclic esters
US5274127A (en) * 1990-09-18 1993-12-28 Biopak Technology, Ltd. Lactide production from dehydration of aqueous lactic acid feed
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)
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
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
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
US5043458A (en) * 1990-05-03 1991-08-27 E. I. Du Pont De Nemours And Company One-step continuous process for preparing 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
FI961402A0 (fi) 1996-03-27
PH30804A (en) 1997-10-17
FI961402A (fi) 1996-03-27
AU7726794A (en) 1995-04-18
ZA947211B (en) 1996-06-18
MY113939A (en) 2002-06-29
US5420304A (en) 1995-05-30
EP0722433A1 (fr) 1996-07-24
CN1136309A (zh) 1996-11-20
WO1995009142A1 (fr) 1995-04-06
BR9407655A (pt) 1997-01-28
TW321646B (fr) 1997-12-01
JPH09502997A (ja) 1997-03-25
CA2172798A1 (fr) 1995-04-06
US5750732A (en) 1998-05-12
DE69422819D1 (de) 2000-03-02
ATE189204T1 (de) 2000-02-15
EP0722433B1 (fr) 2000-01-26
EP0722433A4 (fr) 1996-07-31

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