WO2008015885A1 - Procédé de purification d'acide hydroxycarboxylique, procédé de production d'ester cyclique et procédé de production de poly(acide hydroxycarboxylique) - Google Patents
Procédé de purification d'acide hydroxycarboxylique, procédé de production d'ester cyclique et procédé de production de poly(acide hydroxycarboxylique) Download PDFInfo
- Publication number
- WO2008015885A1 WO2008015885A1 PCT/JP2007/063751 JP2007063751W WO2008015885A1 WO 2008015885 A1 WO2008015885 A1 WO 2008015885A1 JP 2007063751 W JP2007063751 W JP 2007063751W WO 2008015885 A1 WO2008015885 A1 WO 2008015885A1
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- Prior art keywords
- acid
- hydroxycarboxylic acid
- cyclic ester
- distillation
- producing
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- 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
- C07C51/43—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation
- C07C51/44—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation by distillation
-
- 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
- C08G63/06—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from hydroxycarboxylic acids
- C08G63/08—Lactones or lactides
Definitions
- the present invention relates to a method for purifying hydroxycarboxylic acid suitable as a raw material for producing polyhydroxycarboxylic acid, a method for producing a cyclic ester containing the same, and a method for producing polyhydroxycarboxylic acid.
- Polyhydroxycarboxylic acids aliphatic polyesters
- polyglycolic acid and polylactic acid are degraded by microorganisms or enzymes existing in the natural world such as soil and sea, so biodegradable polymers have a low environmental impact. It is attracting attention as a material.
- polyhydroxycarboxylic acid has biodegradability and absorbability, and is therefore used as a medical polymer material such as surgical sutures and artificial skin.
- polyglycolic acid has excellent gas barrier properties such as oxygen gas barrier properties, carbon dioxide gas barrier properties, and water vapor barrier properties, and is excellent in heat resistance and mechanical strength. In other fields, applications are being developed independently or in combination with other resin materials.
- Polyhydroxycarboxylic acid can be synthesized, for example, by dehydration polycondensation of hydroxycarboxylic acids such as glycolic acid (hydroxyacetic acid) and lactic acid (hydroxypropanoic acid).
- hydroxycarboxylic acids such as glycolic acid (hydroxyacetic acid) and lactic acid (hydroxypropanoic acid).
- a method of synthesizing a dimeric cyclic ester of hydroxycarboxylic acid and subjecting the cyclic ester to ring-opening polymerization is generally employed.
- polydaricholic acid can be obtained by ring-opening polymerization of glycolide, which is a dimer cyclic ester of glycolic acid.
- Polylactic acid is obtained by ring-opening polymerization of lactide, which is a dimer cyclic ester of lactic acid.
- V a low molecular weight suitable for use and a low amount of heterogeneous bonds
- hydroxycarboxylic acid as a raw material for producing polyhydroxycarboxylic acid must have a certain degree of purity.
- impurities are inevitable in the hydroxycarboxylic acids obtained industrially.
- glycolic acid obtained by the carbonylation reaction of formaldehyde and water in the presence of a catalyst such as organic acid and sulfuric acid is dimerized by ester-forming dehydration condensation of glycolic acid in addition to these catalyst residues.
- Diglycolic acid ( ⁇ (CH COOH)
- ⁇ CH COOH
- ⁇ a dimer of a glycolic acid dimer or oligomer, or dimerized by ether-forming dehydration condensation of glycolic acid
- ⁇ a dimer of a glycolic acid dimer or oligomer, or dimerized by ether-forming dehydration condensation of glycolic acid
- compositions, ionic impurities, etc. can be easily separated and removed industrially by means such as adsorption or ion exchange, but separate means are required to remove organic impurities.
- adsorption or ion exchange ionic impurities
- separate means are required to remove organic impurities.
- the components of a typical sample of an industrial grade 70% glycolic acid aqueous solution are as follows.
- Patent Document 1 JP-T 6-501268
- Patent Document 2 Publication of Special Reissue WO2003 / 064366
- Patent Document 3 Japanese Unexamined Patent Publication No. 2006-169185
- Patent Document 4 JP 2002-128727 A.
- the main object of the present invention is to provide a process for industrially rational purification of hydroxycarboxylic acid useful as a raw material for producing polyhydroxycarboxylic acid, a process for producing a cyclic ester containing the same, and a process for producing polyhydroxycarboxylic acid Is to provide.
- the present inventors have found that the purification power s, the alcohol and the hydroxycarboxylic acid having a purity level useful as a raw material for producing polyhydroxycarboxylic acid It was found that this can be achieved efficiently by distillation of a hydroxycarboxylic acid solution containing a high-boiling hydroxy compound composed of at least one phenol. That is, the method for distillation purification of hydroxycarboxylic acid according to the present invention is characterized by distilling a hydroxycarboxylic acid solution containing a high-boiling hydroxy compound composed of at least one kind of alcohol and phenol having a higher boiling point than hydroxycarboxylic acid.
- the high-boiling hydroxy compound is not distilled by itself, but is a distillation mother liquor (in this specification, the entire liquid that is present in the distillation apparatus and that is subjected to heating for distillation). ) To suppress the progress of polycondensation of hydroxycarboxylic acid and to allow the mother liquor to continue heating for distillation.
- hydroxycarboxylic acid (or an aqueous solution thereof) purified by the above method is subjected to condensation polymerization to form an oligomer of hydroxycarboxylic acid, and the oligomer is depolymerized.
- a cyclic ester composed of a dimer of hydroxycarboxylic acid is formed.
- the method for purifying a hydroxycarboxylic acid of the present invention described above depolymerizes an oligomer in the method for producing a cyclic ester. This is based on the knowledge that it is effective in reducing ether type hydroxycarboxylic acid dimers (for example, diglycolic acid) that act as an inhibitory impurity.
- the method for producing a polyhydroxycarboxylic acid of the present invention is characterized in that the cyclic ester obtained as described above is subjected to ring-opening polymerization.
- FIG. 1 is a schematic view of an apparatus used in an example (comparative example) of a method for distillation purification of hydroxycarboxylic acid according to the present invention.
- ⁇ -hydroxycarboxylic acids having a relatively low boiling point such as glycolic acid, lactic acid, ⁇ -hydroxyvaleric acid, etc. are preferably used. Their production methods such as fermentation methods and synthesis methods are not particularly limited. In any case, the industrially supplied hydroxycarboxylic acid (aqueous solution) has an unavoidable power. Of these, glycolic acid (normal boiling point: about 170 ° C) and lactic acid (normal pressure boiling point: about 220 ° C), which have low boiling points and are suitable for distillation, are preferred. Glycolic acid is most suitable.
- a hydroxycarboxylic acid raw material to be added with a high boiling point hydroxy compound to form a distillation mother liquor is usually diluted with a solvent in order to suppress polycondensation and improve handling properties.
- the diluting solvent can be any solvent miscible with the hydroxycarboxylic acid, but is typically water in the context of the industrial process for producing the hydroxycarboxylic acid.
- diglycolic acid (hereinafter often abbreviated as "di-GA") as a representative example of impurities is contained at a concentration of about 1% by weight (0.93%), More Other impurities include methoxyacetic acid 2.90%, formic acid 0.96%, NH 23ppm, Na6ppm, C
- glycolic acid containing al4ppm, Mg5ppm, SO 74ppm
- an approximately 70% aqueous solution of “GA” is used as a raw material solution.
- the GA aqueous solution as described above may be used as it is as a raw material for distillation, or may be appropriately diluted with water to suppress the polycondensation rate. However, if the degree of dilution increases, the amount of water distilled with GA increases, which is undesirable in terms of thermal efficiency.
- the total concentration of GA and GA dimer in the aqueous GA solution used as the distillation raw material is about 2-90%, more preferably about 20-50%, preferably about 10-70%.
- a high boiling point is used as a main means for suppressing polycondensation that can be caused by subjecting an aqueous GA solution having the above-mentioned concentration as a mother liquor directly to heating distillation. Add the hydroxy compound.
- the high-boiling hydroxy compound added as a polycondensation inhibitor to the distillation mother liquor is at least one of alcohol and phenol having a boiling point higher than that of glycolic acid (or hydroxycarboxylic acid to be purified by distillation). Therefore, it is preferable to have a boiling point higher than 170 ° C, especially 200 ° C or higher!
- the high boiling point hydroxy compound includes a boiling point for suppressing distillation, a force S in which an arbitrary alcohol or phenol having an OH group is used, and specific examples thereof include 1-otadecaneol, diphf Monovalent alcohols such as enylmethanol, dodecanol, 1 tridecanol, 3-phenyl 1 propanol, 1-hexadenol, 1-pentadecanol, or phenols such as 1 naphthol, 2-naphthol, pyrodecanol, etc. are used.
- OH groups such as ethylene glycol, propylene glycol, butylene glycol, hexanediol and decanediol, alkylene glycols containing linear or branched alkylene groups, and diethylene glycol, propylene glycol mononole, butylene.
- these high boiling point hydroxy compounds are produced by a method for producing a cyclic ester according to the present invention described later (that is, under mixing with a polar organic solvent of an oligomer obtained by polycondensation of a hydroxycarboxylic acid purified according to the present invention).
- a polar organic solvent of an oligomer obtained by polycondensation of a hydroxycarboxylic acid purified according to the present invention Of cyclic ester by depolymerization in water
- These high-boiling hydroxy compounds are added to suppress the polycondensation of hydroxycarboxylic acid in the distillation mother liquor.
- the minimum amount is the amount necessary to avoid the inability to continue distillation due to solidification of the distilled mother liquor, and the OH concentration in the mother liquor (alcohol (or the total amount of OH in the GA and high-boiling hydroxy compounds) (Phenol)
- the amount of OH) is about 0.5 mol%.
- a larger amount is preferable for lowering the viscosity of the mother liquor and the distillation temperature.
- the upper limit is mainly determined from the viewpoint of distillation cost, and even if the OH concentration exceeds 50 mol%, the effect of inhibiting polycondensation is saturated.
- the amount of high-boiling hydroxy compound is 0.1 as OH concentration in the mother liquor 5-50 Monore 0/0, more preferably 10 to 40 Monore 0/0, especially preferably in the range of 20 to 30 mole 0/0 is there.
- the total concentration of oligomers containing hydroxycarboxylic acid and its dimer in the mother liquor is usually 30-80% by weight, preferably 35-70. It becomes about% by weight.
- the lower limit of the distillation temperature is determined from the viewpoint of obtaining a substantial distillation rate, and can be lowered under reduced pressure.
- heating above 200 ° C. is not preferable because the rate of formation of di-GA, which is an ether bond of GA, is increased by side reaction.
- a distillation method a tank-type (evaporator) or a tower-type distillation apparatus is used for batch or (semi) continuous.
- di From the viewpoint of purification of GA by separating heavy impurities such as GA and heavy oligomers such as GA oligomer produced by polycondensation, batch-type simple distillation operation may be used, but from the viewpoint of efficient use of equipment. From the above, a semi-continuous system (example described later) in which at least only the feed is continuously performed is more preferably used.
- the high boiling point hydroxy compound used in the present invention has an effect of preventing GA polycondensation and also has an effect of preventing the accumulation of GA oligomer containing GA dimer in the distilled mother liquor.
- GA oligomers containing dimers even when distilling together with GA, are different from ether-type di-GA, and are generally used in the production of glycolide and polyglycolic acid via GA oligomers described below. For the purposes of the production of cyclic esters and polyhydroxycarboxylic acids via carboxylic acid oligomers, it is not a harmful impurity.
- an aqueous solution of hydroxycarboxylic acid purified by the above method is diluted or concentrated as necessary, and then subjected to condensation polymerization to form an oligomer of hydroxycarboxylic acid.
- the oligomer is depolymerized to form a cyclic ester composed of a dimer of hydroxycarboxylic acid.
- the presence of a high boiling point hydroxy compound accompanying the distillation system force or other hydroxycarboxylic acid has no adverse effect.
- hydroxycarboxylic acid is dalicholic acid
- an aqueous GA solution purified and recovered by the above distillation method is prepared to a concentration of 70% or less suitable for storage, storage, and handling. Further, it is recovered as a glycolic acid oligomer by concentration and condensation polymerization, and further depolymerized by the method described in International Publication WO 2002/083661 to obtain darlicolide (a cyclic dimer of glycolic acid) useful as a raw material for polydarlicolic acid. We can gain S).
- the compound (A) having an alcoholic hydroxyl group is present in the depolymerization reaction system.
- the amount of the compound (A) in the depolymerization reaction system is determined by The alkaline strip
- the amount of the alcoholic hydroxyl group of the compound (A) is 0.5 equivalents relative to the total amount of carboxyl groups of the organic acid (B) consisting of diglycolic acid, methoxyacetic acid, and oxalic acid produced by hydrolysis under the conditions
- a method for producing dalicorido characterized by controlling the amount to maintain the above ratio
- a polar organic solvent is used as a solvent for the depolymerization reaction.
- the glycolide is also co-distilled with the produced glycolide to accompany glycolide outside the depolymerization reaction system. End.
- the boiling point of the polar organic solvent is preferably in the range of 230 to 450 ° C.
- the molecular weight of the polar organic solvent is preferably in the range of 150 to 450.
- aromatic dicarboxylic acid diesters aromatic dicarboxylic acid diesters, aliphatic dicarboxylic acid esters, polyalkylene glycol gels, and the like are used. Of these, polyalkylene glycol gel is preferably used.
- the compound (A) having an alcoholic hydroxyl group used in the method for producing glycolide by depolymerization of the glycolic acid oligomer is a high boiling point used in the method for distillation purification of hydroxycarboxylic acid of the present invention. Hydroxy compounds are effectively used as they are.
- the high boiling point hydroxy compound has an action of improving the compatibility of the glycolic acid oligomer and the polar organic solvent and stabilizing the depolymerization reaction system.
- (poly) alkylene glycol monoalkyl ether is preferably used.
- the cyclic ester obtained as described above is known to be a good raw material for producing polyhydroxycarboxylic acid by ring-opening polymerization.
- ring-opening polymerization of the cyclic ester it is preferable to employ a method in which the cyclic ester is heated and melted in the presence of a catalyst, and then the cyclic ester in the molten state is subjected to ring-opening polymerization.
- This polymerization method is a massive ring-opening polymerization method.
- the ring-opening polymerization of the molten cyclic ester can be carried out in a notch type or continuous type using a reactor, tube type, tower type, or extruder type reactor. Usually, it is preferable to employ a method of bulk ring-opening polymerization in a polymerization vessel.
- the polymerization time varies depending on the ring-opening polymerization method and the polymerization temperature, but in the ring-opening polymerization method in the container, it is usually 10 minutes to 100 hours, preferably 30 minutes to 50 hours, more preferably;! To 30 hours. It is.
- the polymerization conversion is usually 95% or more, preferably 98% or more, and more preferably 99% or more. In order to reduce residual unreacted monomers and increase production efficiency, full conversion (polymerization) Most preferably, the conversion is approximately 100%.
- the molten cyclic ester is transferred to a polymerization apparatus having a plurality of tubes (both tubes that can be opened and closed at both ends are preferably used), and ring-opening polymerization is carried out in an airtight state in each tube to form a polymer product.
- a method of precipitating; a cyclic ester in a molten state was produced after proceeding with ring-opening polymerization in a reactor equipped with a stirring or kneading mechanism (for example, a reaction vessel, continuously-polymerizable biaxial stirring device, etc.)
- a method is also preferred in which the polymer is taken out and once cooled and solidified, the solid state polymerization reaction is continued below the melting point of the polymer.
- a cyclic ester containing water and / or alcohol as an initiator or / and a molecular weight regulator is opened using the total proton concentration in the cyclic ester as an index. Preferable to polymerize.
- composition of GA and di-GA as an impurity in the following examples is measured as follows.
- the GA recovery yield is calculated based on the results.
- ICP High Frequency Inductively Coupled Plasma
- NH is “DX-500” manufactured by Dionetas.
- Feeding at a substantially constant flow rate of was started. Then, while controlling the heat input to the evaporator so that the amount of the feed liquid and the amount of the distillate were the same, the distillation operation was carried out for 27 hours, and a total of 689.9 g was fed.
- the temperature of the mother liquor in the can was 141.8 ° C at the start of feeding, and 143.4 ° C after 27 hours.
- the GA concentration in 81.2 g of the first fraction was 6.57%, and no impurities were detected.
- the amount of distillate after cutting the first fraction was 748.4 g, GA (and its dimer) 27. 66% and di-GAO. 03% as impurities (plus methoxyacetic acid 0.40%) , Formic acid 0.35%, NH 3ppm, Na, Ca, Mg and SO were not detected). Also the first
- Feeding of the Eid liquid at an almost constant flow rate was started. Then, while controlling the amount of heat input to the evaporator so that the amount of the feed liquid and the amount of the distillate were the same, a distillation operation was performed for 25 hours to feed a total of 3403. 6 g.
- the temperature of the mother liquor in the can was 139 ° C at the start of feeding and 140 ° C after 25 hours.
- the amount of the distillate recovered by partial condensation was 578.7 g, GA (and its dimer) 31. 15% and di-GAO. 03% as an impurity (further 0.35% methoxyacetic acid, Formic acid 0.36%, NH 4ppm, Na, Ca, Mg and SO were not detected).
- the impurity di-GA concentration is kept low at 0 ⁇ 03% (0 ⁇ 10% of GA), which is a significant purification effect compared to the feed solution concentration (1.40% of GA).
- the GA yield was low, it was possible to continue the distillation operation, but it was necessary to treat a large amount of evaporated water.
- hydroxycarboxylic acids such as glycolic acid purified by the method of the present invention can be used as raw materials for other chemically synthesized products with a purity equal to or lower than that, If necessary, it can also be used as a raw material for a purification method for obtaining a higher purity hydroxycarboxylic acid, for example, the crystallization method of Patent Document 1 or 2, although the yield as one pass is low.
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/309,872 US8039548B2 (en) | 2006-08-02 | 2007-07-10 | Method for purifying hydroxycarboxylic acid, method for producing cyclic ester, and method for producing polyhydroxycarboxylic acid |
EP07790569.3A EP2050733B1 (en) | 2006-08-02 | 2007-07-10 | Method for purifying hydroxycarboxylic acid, method for producing cyclic ester, and method for producing polyhydroxycarboxylic acid |
CN200780028403.5A CN101495440B (zh) | 2006-08-02 | 2007-07-10 | 羟基羧酸的纯化方法、环状酯的制造方法和聚羟基羧酸的制造方法 |
Applications Claiming Priority (4)
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JP2006211247 | 2006-08-02 | ||
JP2006-211247 | 2006-08-02 | ||
JP2007-025282 | 2007-02-05 | ||
JP2007025282A JP5280007B2 (ja) | 2006-08-02 | 2007-02-05 | ヒドロキシカルボン酸の精製方法、環状エステルの製造方法およびポリヒドロキシカルボン酸の製造方法 |
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WO2008015885A1 true WO2008015885A1 (fr) | 2008-02-07 |
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PCT/JP2007/063751 WO2008015885A1 (fr) | 2006-08-02 | 2007-07-10 | Procédé de purification d'acide hydroxycarboxylique, procédé de production d'ester cyclique et procédé de production de poly(acide hydroxycarboxylique) |
Country Status (5)
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US (1) | US8039548B2 (ja) |
EP (1) | EP2050733B1 (ja) |
JP (1) | JP5280007B2 (ja) |
CN (1) | CN101495440B (ja) |
WO (1) | WO2008015885A1 (ja) |
Cited By (1)
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WO2012001003A1 (en) | 2010-07-02 | 2012-01-05 | Metabolic Explorer | Method for the preparation of hydroxy acids |
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US20090107684A1 (en) | 2007-10-31 | 2009-04-30 | Cooke Jr Claude E | Applications of degradable polymers for delayed mechanical changes in wells |
US20040231845A1 (en) | 2003-05-15 | 2004-11-25 | Cooke Claude E. | Applications of degradable polymers in wells |
US8899317B2 (en) | 2008-12-23 | 2014-12-02 | W. Lynn Frazier | Decomposable pumpdown ball for downhole plugs |
US8079413B2 (en) | 2008-12-23 | 2011-12-20 | W. Lynn Frazier | Bottom set downhole plug |
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US9109428B2 (en) | 2009-04-21 | 2015-08-18 | W. Lynn Frazier | Configurable bridge plugs and methods for using same |
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US9127527B2 (en) | 2009-04-21 | 2015-09-08 | W. Lynn Frazier | Decomposable impediments for downhole tools and methods for using same |
FR2974802B1 (fr) | 2011-05-06 | 2013-09-13 | Roquette Freres | Procede de purification de l'acide glycolique par distillation |
FR2974804B1 (fr) | 2011-05-06 | 2013-05-03 | Roquette Freres | Procede de preparation d'un acide glycolique de haute purete |
FR2974803B1 (fr) | 2011-05-06 | 2013-05-03 | Roquette Freres | Procede de preparation d'un acide glycolique partiellement purifie |
US20140171614A1 (en) | 2011-07-22 | 2014-06-19 | Toray Industries, Inc. | Method for producing organic acid |
JP5817574B2 (ja) * | 2012-02-08 | 2015-11-18 | 日本ゼオン株式会社 | cis−3−ヘキセナールの蒸留方法 |
EP2745905A1 (en) * | 2012-12-21 | 2014-06-25 | ThyssenKrupp Uhde GmbH | Process for the purification of carboxylic acids by subcritical or supercritical fluid chromatography |
MX2017006200A (es) * | 2014-11-14 | 2017-11-17 | Gemphire Therapeutics Inc | Procesos e intermediarios para preparar dialcano eteres terminados con acido a, ?-dicarboxilico. |
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CN107286126A (zh) * | 2016-04-13 | 2017-10-24 | 中国石油化工股份有限公司 | 1,4-二氧杂环-2,5-己二酮的制备方法 |
TR201702016A2 (tr) * | 2017-02-10 | 2018-08-27 | Tuerkiye Bilimsel Ve Teknolojik Arastirma Kurumu Tuebitak | Düşük mali̇yetli̇ yüksek moleküler ağirlikli ve yüksek çözünürlüğe sahi̇p poli̇gli̇koli̇k asi̇t sentezi̇ |
JP6751221B2 (ja) * | 2018-03-07 | 2020-09-02 | 株式会社クレハ | 環状エステルの製造方法 |
CN108689833B (zh) * | 2018-06-01 | 2021-03-16 | 安徽恒星制药有限公司 | 一种稳定的高纯度乳酸制备方法 |
CN112469761B (zh) | 2018-10-29 | 2023-05-26 | 上海浦景化工技术股份有限公司 | 聚乙醇酸和乙交酯的受控生产 |
WO2022025110A1 (ja) * | 2020-07-31 | 2022-02-03 | 三菱瓦斯化学株式会社 | α-ヒドロキシカルボン酸組成物の製造方法 |
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- 2007-07-10 EP EP07790569.3A patent/EP2050733B1/en not_active Not-in-force
- 2007-07-10 WO PCT/JP2007/063751 patent/WO2008015885A1/ja active Application Filing
- 2007-07-10 US US12/309,872 patent/US8039548B2/en active Active
- 2007-07-10 CN CN200780028403.5A patent/CN101495440B/zh active Active
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Also Published As
Publication number | Publication date |
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US8039548B2 (en) | 2011-10-18 |
JP2008056654A (ja) | 2008-03-13 |
JP5280007B2 (ja) | 2013-09-04 |
EP2050733A1 (en) | 2009-04-22 |
EP2050733B1 (en) | 2013-11-06 |
US20090318716A1 (en) | 2009-12-24 |
CN101495440A (zh) | 2009-07-29 |
CN101495440B (zh) | 2015-06-03 |
EP2050733A4 (en) | 2010-09-22 |
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