WO1997030962A1 - PROCESS FOR PREPARING FREE α-HYDROXY ACIDS FROM AMMONIUM SALTS THEREOF - Google Patents
PROCESS FOR PREPARING FREE α-HYDROXY ACIDS FROM AMMONIUM SALTS THEREOF Download PDFInfo
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- WO1997030962A1 WO1997030962A1 PCT/JP1997/000528 JP9700528W WO9730962A1 WO 1997030962 A1 WO1997030962 A1 WO 1997030962A1 JP 9700528 W JP9700528 W JP 9700528W WO 9730962 A1 WO9730962 A1 WO 9730962A1
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- Prior art keywords
- water
- group
- acid
- hydroxy
- heating
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Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C319/00—Preparation of thiols, sulfides, hydropolysulfides or polysulfides
- C07C319/14—Preparation of thiols, sulfides, hydropolysulfides or polysulfides of sulfides
- C07C319/20—Preparation of thiols, sulfides, hydropolysulfides or polysulfides of sulfides by reactions not involving the formation of sulfide groups
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/02—Preparation of carboxylic acids or their salts, halides or anhydrides from salts of carboxylic acids
-
- 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
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/582—Recycling of unreacted starting or intermediate materials
Definitions
- the present invention relates to a method for producing ⁇ -hydroxy acid, which is useful as a synthetic raw material for various medicines and agricultural chemicals, a food additive or a feed additive.
- the most common conventional method for chemically synthesizing ⁇ -hydroxy acid is a method of hydrolyzing high hydroxy nitrile with a mineral acid such as sulfuric acid.
- mineral salts such as ammonium bisulfate are generated in the same amount or more, and the mineral salts must be treated, which causes a problem of a large amount of waste disposal.
- Metals of ⁇ -hydroxy acid obtained by biological methods such as microbial fermentation of a mixture containing saccharides or by hydrolyzing ⁇ -hydroxynitrile with a hydrolase produced by a microorganism. It is also known to obtain a free ⁇ -hydroxy acid from a salt or an ammonium salt by reacting a mineral acid such as sulfuric acid or using an ion-exchange resin. Generate similar problems.
- Another chemical synthesis method is to hydrolyze ⁇ -hydroxynitrile using an inorganic base such as sodium hydroxide.
- an inorganic base such as sodium hydroxide.
- it in order to obtain ⁇ - hydroxy acid, it must be neutralized with a mineral acid or the like. At this time, the same amount of mineral acid salt is generated, and the same problem of waste disposal occurs. .
- the process for producing free acids from ammonium carboxylate includes unsaturated P97 / A method of adding unsaturated water to an ammonium salt of a fatty acid by adding a small amount of water and completely removing ammonia at a temperature of 80 ° C or higher in an organic solvent while removing ammonia to obtain an unsaturated fatty acid (UK Patent Publication 9677352 ), (Meta) An organic solvent that azeotropes with water is added to a 10 to 50% aqueous solution of ammonium acrylate ammonium salt, and the mixture is heated to 60 to 100 ° C and water is azeotropically distilled off.
- a method for obtaining (meta) acrylic acid by distilling off ammonia (Japanese Patent Application Laid-Open No. 54-115153) is to supply water to a 10 to 80% aqueous solution of ammonium salt of acidic amino acid.
- There is known a method in which ammonia and water are distilled off by heating while heating to obtain an acidic amino acid Japanese Patent Application Laid-Open No. 7-330696).
- An object of the present invention is to provide a method for producing a free acid of ⁇ -hydroxy acid in a high yield from an ammonium salt of hydroxy acid in a method that does not cause a problem of waste treatment.
- the present invention provides a first step of heating an ammonium salt of ⁇ -hydroxy acid represented by the following general formula [I] in a solvent-free or organic solvent to remove generated ammonia and water, followed by adding water
- This is a process for producing hydroxy acid comprising a second step of ripening and maturation.
- R represents a hydrogen atom, an alkyl group which may have a substituent, an alkenyl group which may have a substituent, a cycloalkyl group which may have a substituent, Moyo Alkoxy group, aryl group which may have a substituent, aryloxy group which may have a substituent, saturated heterocyclic group which may have a substituent or a substituent. Represents an unsaturated heterocyclic group.
- the ⁇ -hydroxy acid to be used in the present invention is a compound represented by the formula [I].
- R represents a hydrogen atom, an alkyl group (which may have a substituent such as a halogen atom, an alkylthio group, an alkoxy group, or an acyl group); a (halogen atom, an alkylthio group, an alkoxy group, an acyl group)
- An alkenyl group (which may have a substituent such as a halogen atom, an alkylthio group, an alkoxy group, or an acyl group), a cycloalkyl group which may have a substituent, (It may have a substituent such as a halogen atom, an alkylthio group, an alkoxy group, or an acyl group.)
- An alkoxy group or (It may have a substituent such as a halogen atom, an alkylthio group, an alkoxy group, or an acyl group.
- aryl group which may have a substituent such as a halogen atom, an alkylthio group, an alkoxy group, an acyl group, etc.), an aryloxy group, or a (halogen atom, Rukiruchi O group, an alkoxy group, which may have a substituent such as Ashiru group)
- Wakashi Ku saturated denotes an unsaturated heterocyclic group.
- Nitrogen, oxygen, and sulfur are hetero atoms such as 2-phenyl, 3-phenyl, 2-pyrrolyl, 3-pyrrolyl, 2-furyl, and 3-furyl.
- a 3- to 7-membered heterocyclic group containing at least one kind is exemplified.
- ⁇ -Hydroxy acid specifically, glycolic acid, lactic acid, mandelic acid, ⁇ -hydroxybutyric acid, ⁇ -hydroxyisobutyric acid, ⁇ -hydroxyvaleric acid, ⁇ -hydric acid Oral xylisovaleric acid, -hydroxyoctanoic acid, ⁇ -hydroxy-3 -butenoic acid, ⁇ -hydroxy-13 -clopropionic acid, -hydroxy-4 -methylthiobutyric acid, ⁇ -hydroxy-2- Examples include pyridyl acetic acid, ⁇ -hydroxy-2-acetic acid, ⁇ -hydroxy-2-pyrrolacetic acid, ⁇ -hydroxy-2-furyl acetic acid, and the like.
- the ammonium salt of ⁇ -hydroxy acid can be produced by a method in which ⁇ -hydroxynitrile is hydrolyzed by a hydrolase produced by a microorganism. Further, when ⁇ -hydroxy acid is obtained as a metal salt by a hydrolysis reaction of ⁇ -hydroxynitrile with an inorganic base or a microbial reaction, for example, Japanese Patent Application Laid-Open No. It can be converted to ammonium salt in the same way as shown in Figure 7.
- the present invention is a production method comprising the following two steps.
- ⁇ -Hydroxy acid ammonium salt is heated in a solvent-free or organic solvent to form low molecular weight poly- ⁇ -hydroxy acids while removing water and ammonia.
- the first step is to remove the water and ammonia while heating the ammonium salt of ⁇ -hydroxy acid to make it a low molecular weight poly- ⁇ -hydroxy acid.
- the reaction system may be in a reduced pressure state.
- various distillation apparatuses can be used.
- the reaction temperature is usually in the range of 40 to 200 ° C, preferably 60 to 170 ° C.
- the pressure of the reaction system is 0.1 to 7 It is performed in the range of 60 mmHg.
- the end point of the reaction is the point at which the distillation of water and ammonia has ceased, but the remaining ammonia can be recovered and recycled as ⁇ -hydroxyammonium ammonium salt after the reaction. If desired, the reaction can be stopped during the reaction.
- the purity of the ⁇ -hydroxy acid obtained can be improved by replacing inert gases such as nitrogen, argon, and helium. .
- inert gases such as nitrogen, argon, and helium.
- introducing an inert gas into the reaction solution improves the efficiency of removing the ammonia.
- an organic solvent that can be used in the first step an organic solvent that does not react with hydroxylic acid and ammonia can be used, and an organic solvent having a boiling point of 40 or more can be used, and an azeotropic solvent with water is preferable.
- an organic solvent having a boiling point of 40 or more can be used, and an azeotropic solvent with water is preferable.
- ⁇ -hydroxy acid amide may be formed as a by-product, which is formed by the reaction of dissolved ammonium with low-molecular-weight poly- ⁇ -hydroxy acid. .
- the by-product rate can be suppressed to 2% or less by selecting an organic solvent, adjusting the degree of reduced pressure, or increasing the evaporation area.
- Otsu no a-hydroxyamide is hydrolyzed in the second step to form ⁇ -hydroxyammonium salt, which further reduces the by-product rate.
- the ammonia distilled off in the first step can be recovered as ammonia gas, which has high utility value.
- the amount of water to be added is usually 0.1 to 10 times by weight of the residual weight after the completion of the first step reaction, and preferably 0.2 to 3 times by weight.
- the reaction temperature is 50 to 100 ° C. when the reaction is performed under atmospheric pressure, but the reaction may be performed under pressure. If a pressure-resistant reactor is used, the reaction can be performed at 100 to 300 ° C., preferably 120 to 170 ° C., and the reaction time can be shortened.
- the low molecular weight poly-hydroxy acids are hydrolyzed into hydroxy acid, and a part of the ⁇ -hydroxy acid amide by-produced in the first step is also added. It is hydrolyzed to ⁇ -hydroxy ammonium salt.
- ⁇ -hydroxy acid can be mostly obtained as a free acid, but part of the ⁇ -hydroxy acid amide and by-product ⁇ -hydroxy acid amide remaining in the first step Reacts with ammonia produced by hydrolysis, and may remain as ⁇ -hydroxyammonium salt.
- the ⁇ -hydroxyammonium ammonium salt formed in the system can be recycled as a starting material in the first step.
- water is distilled off from the obtained aqueous solution of ⁇ -hydroxy acid, whereby free ⁇ -hydroxy acid having a purity of 80% or more can be obtained.
- any organic solvent which is insoluble in water and dissolves the free acid of the hydroxy acid can be used without particular limitation. Examples thereof include toluene, ethyl acetate, methyl isoptyl ketone, ⁇ -butanol, diisopropyl ether, and dichloroethane.
- continuous extraction by countercurrent distribution can also be employed, and by this operation, the recovery of the free acid of ⁇ -hydroxy acid can be improved.
- the free ⁇ -hydroxy acid can be precipitated in an aqueous solution after the reaction in the second step instead of extraction with an organic solvent, followed by filtration and isolation.
- the aqueous solution from which free ⁇ -hydroxy acid was obtained by the above method that is, the filtrate obtained by separating the aqueous layer or crystals after extraction with the organic solvent, was recycled as a starting material in the first step after port shrinkage. Is possible.
- a rectification tube was attached to a 100 ml flask equipped with a stirrer and a thermometer. At the top, a fractionation head equipped with a thermometer and a reflux condenser was attached. At the fractionation head, the distilling organic solvent and water were separated, and only the organic solvent was returned to the rectification tube and refluxed.
- Into this 10 Om1 flask add 14.20 g of an aqueous solution containing 5.3.4 mimol of ⁇ -hydroxy-4—methylthiobutyric acid ammonium salt and 40 m1 of xylene, and add about 150 The mixture was heated and stirred in an oil bath at ° C.
- the total amount of the solution after the reaction was 58.8 g. After the reaction, the solution was concentrated under reduced pressure, and 5.
- Example 2 An apparatus similar to that of Example 1 was assembled, and into this 100 ml flask, 5.84 g of an aqueous solution containing ammonium salt of 45.61 mimol and 40 ml of xylene were added. The mixture was heated and stirred in an oil bath at 0 ° C. At the beginning of the reaction, an azeotrope of xylene and water rose to the top of the column, and the temperature at the top was 92-93. As the reaction proceeded, water was distilled off, and the temperature at the top of the column gradually increased to reach the xylene boiling point of about 140. During the reaction, most of the ammonia was discharged from the top of the reflux condenser as gas except for the amount dissolved in the distillate.
- Example 2 The same apparatus as in Example 1 was assembled, and into this 100 ml flask were placed 10.46 g of an aqueous solution containing 5.8.78 millimoles of ammonium mandelic acid and 40 ml of xylene. The mixture was heated and stirred in an oil bath at about 150 ° C. At the beginning of the reaction, an azeotropic mixture of xylene and water rose to the top of the column, and the temperature at the top was 92 to 93 ° C. As the reaction progressed, water was distilled off and the temperature at the top of the column gradually increased to reach the boiling point of xylene of about 140 ° C. During the reaction, ammonia was discharged as gas from the top of the reflux condenser.
- Example 2 An apparatus similar to that in Example 1 was assembled, and an aqueous solution containing a-hydroxy-14-ammonium salt 43.24 mimol 10.01 g and anisol 50 0 m 1 was placed in an oil bath at about 170 ° C., and heated and stirred. As the reaction proceeded, water was distilled off and the temperature at the top of the column gradually increased to reach the boiling point of anisol at about 156 ° C. During the reaction, most of the ammonia, other than that dissolved in the distillate, was discharged as gas from the top of the reflux condenser. After heating under reflux for 4 hours, anisol was distilled off under reduced pressure to obtain 6.78 g of an oil.
- Example 2 The same apparatus as in Example 1 was assembled, and in this 10 O ml flask, 10 ⁇ 12 g of an aqueous solution containing 4-hydroxyammonium ammonium salt 4 ⁇ 3. Put 50 ml of one rubetiyl ether, about 150. The mixture was placed in a C oil bath and stirred with heating. As the reaction proceeded, water was distilled off and the temperature at the top of the column gradually increased to reach the boiling point of ethylene glycol getyl ether at about 121 ° C. During the reaction, most of the ammonia, other than that dissolved in the distillate, was discharged as gas from the top of the reflux condenser.
- the by-product rate of the hydroxy-4-methylthiobutyric acid amide and the yield of the free acid of the hydroxy-4-methylthiobutyric acid were calculated to be 1.1% and 90%, respectively, in consideration of the dimer integration. 9%. 8th clothing
- a 50 m flask equipped with a stirrer, thermometer and gas inlet tube was fitted with a straight tube, and a distillation head equipped with a thermometer and a reflux condenser was installed at the top of the straight tube.
- a distillation head equipped with a thermometer and a reflux condenser was installed at the top of the straight tube.
- Into this 50 ml flask 5.09 g of an aqueous solution containing 20.6 1 mmol of ⁇ -hydroxyl-4-methylthiobutyrate ammonium salt and 20 ml of diethylene glycol dimethyl ether were added. The mixture was heated and stirred in an oil bath at 144 ° C.
- reaction solution nitrogen gas is introduced into the reaction solution at a rate of 100 m 1 / min, and water existing in the raw materials and water generated during the reaction are azeotroped with diethylene glycol dimethyl ether. As a result, it was distilled out of the reaction system. Most of the ammonia produced during the reaction was discharged from the top of the reflux condenser as gas, except for the amount dissolved in the distillate.
- the temperature of the reaction solution was about 115 ° C at the beginning of the reaction due to the presence of a large amount of water, but gradually increased as the reaction proceeded, and was constant at about 130 ° C. .
- a 50 ml flask equipped with a stirrer and a thermometer was fitted with a straight tube, and a distillation head equipped with a thermometer and a reflux condenser was attached to the top of the straight tube.
- the top of the reflux condenser was connected to a water pump so that the pressure inside the reaction system was reduced.
- 5.0 g of an aqueous solution containing 20.25 mmol of ⁇ -hydroxy-4-methylthiobutyric acid ammonium salt and 25 ml of diethylene glycol dimethyl ether were added, and the mixture was heated to about 110 ° C. The mixture was heated and stirred in an oil bath.
- the inside of the reaction system was adjusted to 600 to 65 OmmHg with a water flow pump, and water existing in the raw materials and water generated during the reaction were mixed with diethylene glycol dimethyl ether. Distilled out of the reaction system as an azeotrope. Most of the ammonia produced during the reaction, except for the amount dissolved in the distillate, was absorbed by the water-jet pump as gas.
- the temperature of the reaction solution was 90 to 93 ° C at the beginning of the reaction, but gradually increased as the reaction proceeded, and was constant at about 100 ° C. After the reaction for 4 hours, diethylene glycol dimethyl ether was distilled off under reduced pressure to obtain 4.08 g of an oil.
- the content was 57 millimoles, and the others were poly- ⁇ -hydroxy-4-methylthiobutyric acids.
- the residual solution obtained after the reaction was transferred to an autoclave with an internal volume of about 60 ml, added with 20 ml of water, and placed in an oil bath at 170 to 1750C for 4 hours. Heated. The internal pressure during heating was 3 kgf / cm 2 . After cooling to room temperature, the reaction solution was transferred to a 50 ml eggplant flask, and water was distilled off under reduced pressure to obtain 7.45 g of an oil.
- Table 12 According to the analysis results, the residual ratio of ammonia was 6.2.
- the yield of ⁇ -hydroxy-4-methylthiobutyrate amide and the free acid of ⁇ -hydroxy-4-methylthiobutyrate were determined by dimer integration. The calculated values were 0.4% and 83.2%, respectively. Table 12
- Ammonium lactate salt 7 9.58 g Aqueous solution containing 9.04 g of an aqueous solution was charged into a 50-ml small flask, and 11 to 14 mmHg, 118 to 1 using a rotary evaporator. Heating was carried out at 20 ° C for 6 hours to remove generated ammonia and water. The total amount of the remaining reaction solution was 6.62 g, which contained 6.31 millimoles of ammonium lactate, 1.04 millimoles of lactamide, and the others contained polylactic acid. It was kind.
- Ammonium mandelic acid salt 4.5.84 A solution containing 9.04 g of mimol was charged into a 50-ml eggplant-shaped flask, and 0.5 to 0 mmHg, 1 was prepared using a rotary evaporator. The mixture was heated for 4 hours under the condition of 18 to 120 to remove generated ammonia and water. The total amount of the remaining reaction solution was 6.09 g, which contained 1.38 mmol of ammonium mandelate and 0.49 mmol of mandelamide. Polymandelic acids. The residual solution obtained after the reaction was transferred to an autoclave having an internal volume of about 60 ml, added with 20 ml of water, and placed in an oil bath at 170 to 175 ° C and heated for 4 hours. .
- the internal pressure during heating was 3 kgf Z cm 2 .
- the reaction solution was transferred to a 50 ml eggplant flask, and water was distilled off under reduced pressure to obtain 6.92 g of crystals.
- the analysis results are shown in Table 14. According to the analysis results, the residual ratio of ammonia was 3.6%, and the yield of free acid with respect to the charged ammonium salt of mandelic acid was 92.9%.
- the method of the present invention is suitable and advantageous from an industrial viewpoint for the following various reasons.
- Residual ammonia and by-product ⁇ -hydroxy acid amide can be separated from free ⁇ -hydroxy acid as ⁇ -hydroxy ammonium salt after the hydrolysis reaction, and can be recovered and recycled.
- the present invention is a method for industrially and efficiently producing a free acid from an ammonium salt of ⁇ -hydroxy acid, and its industrial significance is large.
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Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97904631A EP0884300B1 (en) | 1996-02-26 | 1997-02-25 | Process for preparing free alpha-hydroxy acids from ammonium salts thereof |
US09/125,710 US6066763A (en) | 1996-02-26 | 1997-02-25 | Process for preparing free α-hydroxy acids from ammonium salts thereof |
DE69709705T DE69709705T2 (de) | 1996-02-26 | 1997-02-25 | Verfahren zur herstellung von freien alpha-hydroxysäuren aus ammoniumsalzen |
JP53000197A JP3923528B2 (ja) | 1996-02-26 | 1997-02-25 | α―ヒドロキシ酸のアンモニウム塩から遊離酸の製造方法 |
AU17351/97A AU1735197A (en) | 1996-02-26 | 1997-02-25 | Process for preparing free alpha-hydroxy acids from ammonium salts thereof |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6367296 | 1996-02-26 | ||
JP8/63672 | 1996-02-26 | ||
JP7323096 | 1996-03-04 | ||
JP8/73230 | 1996-03-04 | ||
JP32341196 | 1996-11-19 | ||
JP8/323411 | 1996-11-19 |
Publications (1)
Publication Number | Publication Date |
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WO1997030962A1 true WO1997030962A1 (en) | 1997-08-28 |
Family
ID=27298246
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1997/000528 WO1997030962A1 (en) | 1996-02-26 | 1997-02-25 | PROCESS FOR PREPARING FREE α-HYDROXY ACIDS FROM AMMONIUM SALTS THEREOF |
Country Status (9)
Country | Link |
---|---|
US (1) | US6066763A (ja) |
EP (1) | EP0884300B1 (ja) |
JP (1) | JP3923528B2 (ja) |
CN (1) | CN1085195C (ja) |
AU (1) | AU1735197A (ja) |
DE (1) | DE69709705T2 (ja) |
ES (1) | ES2166972T3 (ja) |
TW (1) | TW425387B (ja) |
WO (1) | WO1997030962A1 (ja) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005132836A (ja) * | 2003-10-09 | 2005-05-26 | National Institute Of Advanced Industrial & Technology | カルボン酸系化合物の製造方法 |
JP2007254354A (ja) * | 2006-03-23 | 2007-10-04 | National Institute Of Advanced Industrial & Technology | コハク酸系組成物、コハク酸ジアルキル等及びその製造方法。 |
JP2007297340A (ja) * | 2006-05-01 | 2007-11-15 | Asahi Kasei Chemicals Corp | 高純度グリコール酸水溶液の製造法 |
WO2009013909A1 (ja) * | 2007-07-25 | 2009-01-29 | Nippon Soda Co., Ltd. | α-ヒドロキシ酸アンモニウム塩からのα-ヒドロキシ酸の製造方法 |
US8940934B2 (en) | 2008-06-20 | 2015-01-27 | Asahi Kasei Chemicals Corporation | Production process of α-hydroxy acids |
Families Citing this family (11)
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FR2791668B1 (fr) * | 1999-04-02 | 2001-05-04 | Rhone Poulenc Animal Nutrition | Procede de preparation d' beta-hydroxy acides |
US6784317B2 (en) * | 2001-05-02 | 2004-08-31 | Mitsubishi Gas Chemical Company, Inc | Production of quaternary ammonium salt of hydroxycarboxylic acid and quarternary ammonium salt of inorganic acid |
JP2004532855A (ja) * | 2001-05-07 | 2004-10-28 | カーギル インコーポレイテッド | カルボン酸およびその誘導体の調製方法 |
US20030017181A1 (en) * | 2001-05-31 | 2003-01-23 | Rood Gloria A. | Dermatological compositions and methods |
US6773873B2 (en) * | 2002-03-25 | 2004-08-10 | Advanced Technology Materials, Inc. | pH buffered compositions useful for cleaning residue from semiconductor substrates |
JP4696496B2 (ja) * | 2004-08-18 | 2011-06-08 | 住友化学株式会社 | 2−ヒドロキシ−4−メチルチオ酪酸の製造方法 |
WO2006069129A1 (en) * | 2004-12-22 | 2006-06-29 | E.I. Dupont De Nemours And Company | Method for the production of glycolic acid from ammonium glycolate by direct deammoniation |
DE102008040193A1 (de) * | 2008-07-04 | 2010-01-07 | Evonik Röhm Gmbh | Verfahren zur Herstellung freier Carbonsäuren |
DE102008040415A1 (de) | 2008-07-15 | 2010-01-21 | Evonik Röhm Gmbh | Thermisches Salzspalten von Ammoniumcarboxylaten |
DE102009001008A1 (de) | 2009-02-19 | 2010-08-26 | Evonik Degussa Gmbh | Reaktivextraktion von freien organischen Säuren aus deren Ammoniumsalzen |
DE102009009580A1 (de) | 2009-02-19 | 2010-08-26 | Evonik Degussa Gmbh | Verfahren zur Herstellung freier Säuren aus ihren Salzen |
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JPH07330696A (ja) * | 1994-06-01 | 1995-12-19 | Mitsubishi Chem Corp | 酸性アミノ酸の製造方法 |
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GB967352A (en) * | 1962-05-17 | 1964-08-19 | Distillers Co Yeast Ltd | Production of unsaturated aliphatic acids |
US4212994A (en) * | 1978-07-03 | 1980-07-15 | The Dow Chemical Company | Process for the preparation of carboxylic acid |
EP0040254B1 (en) * | 1980-05-16 | 1983-07-13 | The Dow Chemical Company | Process for preparing carboxylic acids by reaction of alkali metal carboxylates and liquid cation exchange agents |
JP3428686B2 (ja) * | 1993-07-23 | 2003-07-22 | 関東電化工業株式会社 | 1,1−ジクロロ−1−フルオロエタンの製造法 |
DE4341770A1 (de) * | 1993-12-08 | 1995-06-14 | Basf Ag | Verfahren zur Herstellung von Milchsäureestern |
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1997
- 1997-02-25 ES ES97904631T patent/ES2166972T3/es not_active Expired - Lifetime
- 1997-02-25 US US09/125,710 patent/US6066763A/en not_active Expired - Fee Related
- 1997-02-25 WO PCT/JP1997/000528 patent/WO1997030962A1/ja active IP Right Grant
- 1997-02-25 JP JP53000197A patent/JP3923528B2/ja not_active Expired - Fee Related
- 1997-02-25 AU AU17351/97A patent/AU1735197A/en not_active Abandoned
- 1997-02-25 DE DE69709705T patent/DE69709705T2/de not_active Expired - Fee Related
- 1997-02-25 EP EP97904631A patent/EP0884300B1/en not_active Expired - Lifetime
- 1997-02-25 CN CN97192573A patent/CN1085195C/zh not_active Expired - Fee Related
- 1997-02-26 TW TW086102349A patent/TW425387B/zh not_active IP Right Cessation
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JPS54115317A (en) * | 1978-02-25 | 1979-09-07 | Nitto Chem Ind Co Ltd | Preparation of acrylic acid or methacrylic acid |
JPS63264546A (ja) * | 1987-04-20 | 1988-11-01 | Asahi Chem Ind Co Ltd | 工業廃酸を利用したカルボン酸の製造法 |
JPH07330696A (ja) * | 1994-06-01 | 1995-12-19 | Mitsubishi Chem Corp | 酸性アミノ酸の製造方法 |
Non-Patent Citations (1)
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005132836A (ja) * | 2003-10-09 | 2005-05-26 | National Institute Of Advanced Industrial & Technology | カルボン酸系化合物の製造方法 |
JP2007254354A (ja) * | 2006-03-23 | 2007-10-04 | National Institute Of Advanced Industrial & Technology | コハク酸系組成物、コハク酸ジアルキル等及びその製造方法。 |
JP2007297340A (ja) * | 2006-05-01 | 2007-11-15 | Asahi Kasei Chemicals Corp | 高純度グリコール酸水溶液の製造法 |
WO2009013909A1 (ja) * | 2007-07-25 | 2009-01-29 | Nippon Soda Co., Ltd. | α-ヒドロキシ酸アンモニウム塩からのα-ヒドロキシ酸の製造方法 |
JP5143838B2 (ja) * | 2007-07-25 | 2013-02-13 | 日本曹達株式会社 | α−ヒドロキシ酸アンモニウム塩からのα−ヒドロキシ酸の製造方法 |
US8940934B2 (en) | 2008-06-20 | 2015-01-27 | Asahi Kasei Chemicals Corporation | Production process of α-hydroxy acids |
Also Published As
Publication number | Publication date |
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ES2166972T3 (es) | 2002-05-01 |
US6066763A (en) | 2000-05-23 |
JP3923528B2 (ja) | 2007-06-06 |
DE69709705T2 (de) | 2002-06-13 |
EP0884300A4 (en) | 1999-09-01 |
EP0884300A1 (en) | 1998-12-16 |
DE69709705D1 (de) | 2002-02-21 |
AU1735197A (en) | 1997-09-10 |
CN1211971A (zh) | 1999-03-24 |
TW425387B (en) | 2001-03-11 |
EP0884300B1 (en) | 2001-11-21 |
CN1085195C (zh) | 2002-05-22 |
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