PH30804A - Method to produce cyclic esters. - Google Patents

Method to produce cyclic esters.

Info

Publication number
PH30804A
PH30804A PH49051A PH49051A PH30804A PH 30804 A PH30804 A PH 30804A PH 49051 A PH49051 A PH 49051A PH 49051 A PH49051 A PH 49051A PH 30804 A PH30804 A PH 30804A
Authority
PH
Philippines
Prior art keywords
cyclic esters
starting materials
recovery
production
molecular weight
Prior art date
Application number
PH49051A
Other languages
English (en)
Inventor
Dan W Verser
Cheung Alex
Timothy J Eggeman
William A Evanko
Kevin H Schilling
Meiser Manfred
Anthony E Allen
Melville E D Hillman
George E Cremeans
Edward S Lipinsky
Original Assignee
Bro Pak 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 Bro Pak Technology Ltd filed Critical Bro Pak Technology Ltd
Publication of PH30804A publication Critical patent/PH30804A/en

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)
  • Polymers & Plastics (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Medicinal Chemistry (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)
PH49051A 1993-09-29 1994-09-23 Method to produce cyclic esters. PH30804A (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
PH30804A true PH30804A (en) 1997-10-17

Family

ID=22437018

Family Applications (1)

Application Number Title Priority Date Filing Date
PH49051A PH30804A (en) 1993-09-29 1994-09-23 Method to produce cyclic esters.

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) ZA961426B (de)

Families Citing this family (56)

* 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
EP0832062B1 (de) 1995-06-07 2001-09-12 Novus International, 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
US6229046B1 (en) 1997-10-14 2001-05-08 Cargill, Incorported Lactic acid processing methods arrangements and products
US6475759B1 (en) * 1997-10-14 2002-11-05 Cargill, Inc. Low PH lactic acid fermentation
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
ES2400285T3 (es) * 1999-03-11 2013-04-08 Zeachem, Inc. Proceso para producir etanol
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
EP1513940A4 (de) 2002-05-30 2006-10-25 Cargill Dow Llc Verfahren und materialien zur produktion von milchsäure in hefe
EP1626979B1 (de) 2003-05-02 2012-06-06 Cargill, Incorporated Genetisch modifizierte hefeart und fermentationsverfahren, bei denen die genetisch modifizierte hefe eingesetzt wird
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
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
JP5443970B2 (ja) 2006-03-13 2014-03-19 カーギル インコーポレイテッド ジヒドロキシアセトンリン酸からグリセロールへの経路が破壊された酵母細胞
JP5083775B2 (ja) 2006-03-29 2012-11-28 Bio−energy株式会社 乳酸発酵液からの乳酸成分の分離方法および分離装置
DE102006055427A1 (de) * 2006-11-22 2008-05-29 Evonik Röhm Gmbh Verfahren zur Herstellung von Tetramethylglycolid
AU2008212826A1 (en) * 2007-02-09 2008-08-14 Zeachem Inc. Energy efficient methods to produce products
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
EP2633027B1 (de) 2010-10-28 2014-06-04 Total Research & Technology Feluy SA Verfahren zur herstellung von polymilchsäure unter verwendung von monascus
MX2013005654A (es) 2010-11-22 2013-07-17 Novozymes Inc Composiciones y metodos para la produccion de acido 3-hidroxipropionico.
WO2012103261A2 (en) 2011-01-25 2012-08-02 Finley Kenneth R Compositions and methods for succinate production
WO2013119959A1 (en) 2012-02-09 2013-08-15 Novus International Inc. Heteroatom containing cyclic dimers
CA2878617A1 (en) 2012-07-12 2014-01-16 Houston Stephen Smith Matrix and layer compositions for protection of bioactives
US9850507B2 (en) 2012-07-25 2017-12-26 Cargill, Incorporated Yeast cells having reductive TCA pathway from pyruvate to succinate and overexpressing an exogenous NAD(P)+ transhydrogenase enzyme
EP2725019B1 (de) * 2012-10-26 2015-04-08 Uhde Inventa-Fischer GmbH Verfahren zur Herstellung cyclischer Diester, insbesondere Dilactid
CA2891130A1 (en) 2012-11-30 2014-06-05 Novozymes, Inc. 3-hydroxypropionic acid production by recombinant yeasts
CN105431520A (zh) 2013-07-31 2016-03-23 诺维信公司 利用表达昆虫天冬氨酸1-脱羧酶的重组酵母的3-羟基丙酸生产
WO2016100910A1 (en) 2014-12-19 2016-06-23 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
US20180265902A1 (en) 2015-08-24 2018-09-20 Novozymes A/S Beta-Alanine Aminotransferases For The Production of 3-Hydroxypropionic Acid
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
TWI780152B (zh) 2017-05-12 2022-10-11 日商中外製藥股份有限公司 環狀有機化合物的製造方法
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
EP4389740A1 (de) * 2022-12-21 2024-06-26 Röhm GmbH Polymerisierbares tetramethylglycolid

Family Cites Families (57)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA863673A (en) * 1971-02-16 K. Schneider Allan Absorbable suture
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
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 (de) * 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
EP0261572A1 (de) * 1986-09-20 1988-03-30 Boehringer Ingelheim Kg Verfahren zur Herstellung von Lactid
DE3708915C2 (de) * 1987-03-19 1996-04-04 Boehringer Ingelheim Kg Verfahren zur Herstellung von Lactid
DE3632103A1 (de) * 1986-09-20 1988-03-24 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.
DE3781133T2 (de) * 1986-12-19 1993-06-24 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)
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
US5043458A (en) * 1990-05-03 1991-08-27 E. I. Du Pont De Nemours And Company One-step continuous process for preparing cyclic esters
JPH05506242A (ja) * 1990-05-03 1993-09-16 イー・アイ・デユポン・ドウ・ヌムール・アンド・カンパニー 環状エステルの迅速製造のための改良法
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
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
ATE189204T1 (de) 2000-02-15
CA2172798A1 (en) 1995-04-06
AU7726794A (en) 1995-04-18
MY113939A (en) 2002-06-29
ZA961426B (en) 1996-06-18
ZA947211B (en) 1996-06-18
US5750732A (en) 1998-05-12
TW321646B (de) 1997-12-01
CN1136309A (zh) 1996-11-20
US5420304A (en) 1995-05-30
EP0722433A1 (de) 1996-07-24
EP0722433B1 (de) 2000-01-26
JPH09502997A (ja) 1997-03-25
DE69422819D1 (de) 2000-03-02
WO1995009142A1 (en) 1995-04-06
FI961402A (fi) 1996-03-27
FI961402A0 (fi) 1996-03-27
EP0722433A4 (de) 1996-07-31
BR9407655A (pt) 1997-01-28

Similar Documents

Publication Publication Date Title
PH30804A (en) Method to produce cyclic esters.
ATE88442T1 (de) Verfahren zur trennung von zucker und konzentrierter schwefelsaeure.
TW331646B (en) Produce cyclic ester.
AU6615894A (en) Recovery of citric acid from impure process streams by addition of strong acids and salts thereof
GB1488773A (en) Process for the preparation of propylene oxide
DE60110932D1 (de) Kontinuierliches verfahren zur herstellung von l-ascorbinsäure
JPS5821621B2 (ja) ユウキヨウザイチユウ ノ ペルカルボンサンヨウエキ ノ セイホウ
SU719497A3 (ru) Способ рекуперации перекиси водорода
ES2189764T3 (es) Proceso para la separacion y purificacion de una mezcla acuosa que tiene como componentes principales acido acetico y acido formico.
JPH11292802A (ja) 改良された酸化プロピレンとスチレン単量体の同時製造方法
GB1489037A (en) Process for the preparation of organic solutions of percarboxylic acids
US2915558A (en) Process for the separation of diisopropylbenzene dihydroperoxides
US4897085A (en) Recovery of hydrogen peroxide
JP2505836B2 (ja) 粗イソプロピルアルコ―ルの精製方法
AU2002233613A1 (en) Process and apparatus for the production of calcium bromide by liquid-liquid extraction
JPS5829790B2 (ja) 有機溶媒中過カルボン酸の連続製造法
GB1495481A (en) Process for the obtaining of isobutylene of high purity
PH20955A (en) Process for purifying wet-processed phosphoric acid
JPH05186391A (ja) 酢酸エチルの精製法
JPH0782247A (ja) 第3級ブチルハイドロパーオキシド含有混合物の製造方法
CN114539081B (zh) 一种利用n,n-二丁基乙醇胺分离提纯甘氨酸的方法
HU208306B (en) Process for purifying paraffin sulfonic acids
GB1497970A (en) Process for the preparation of propylene oxide
US4296251A (en) Synthesis of (+)-cis-homocaronic acid
ATE555077T1 (de) Hochkonzentrierte wässrige lösungen von n,n- dialkyl-glyzinen und verfahren zu deren herstellung