GB280969A - Improved process for the purification of lactic acid - Google Patents
Improved process for the purification of lactic acidInfo
- Publication number
- GB280969A GB280969A GB3134227A GB3134227A GB280969A GB 280969 A GB280969 A GB 280969A GB 3134227 A GB3134227 A GB 3134227A GB 3134227 A GB3134227 A GB 3134227A GB 280969 A GB280969 A GB 280969A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acid
- ether
- salt
- lactic acid
- freed
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
Links
Classifications
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Extraction Or Liquid Replacement (AREA)
Abstract
280,969. Klapproth, W. Nov. 22, 1927. [A Specification was laid open to inspection under Sect. 91 of the Acts, Nov. 23, 1927]. Lactic acid is purified by extraction with a solvent such as ether or a higher alcohol in the presence of a strong acid and excess of a salt of the strong acid; for instance sulphuric phosphoric, or oxalic acid and a salt of such acid. In an example 1000 parts of raw acid is treated with 80 parts of concentrated sulphuric acid and 120 parts dry sodium sulphate and is extracted with ether. The extract is washed with concentrated solution of a neutral or acid lactate, for instance of sodium, calcium or barium, and the lactic acid extract is then freed from ether which is used again. The lactic acid may be freed from colouring matter by decolorizing charcoal. If the raw acid is inferior and a very pure product is required, the acid obtained as above is mixed with 5-10 per cent of concentrated sulphuric acid and heated to 80-100‹ to destroy impurities. Sodium sulphate is then added and the extraction with ether is again effected as described above. A prior process is referred to in which the raw acid is first converted into a salt, for instance a calcium, zinc, or magnesium salt, the salt is recrystallized, tha acid liberated and freed from heavy metals such a; iron, lead and copper by precipitation treat. ments after which the sulphuric acid present is carefully neutralized and the lactic acid extracted with ether or other suitable agent.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3134227A GB280969A (en) | 1927-11-22 | 1927-11-22 | Improved process for the purification of lactic acid |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3134227A GB280969A (en) | 1927-11-22 | 1927-11-22 | Improved process for the purification of lactic acid |
Publications (1)
Publication Number | Publication Date |
---|---|
GB280969A true GB280969A (en) | 1928-06-14 |
Family
ID=10321691
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3134227A Expired GB280969A (en) | 1927-11-22 | 1927-11-22 | Improved process for the purification of lactic acid |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB280969A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2710880A (en) * | 1953-05-07 | 1955-06-14 | Edward M Filachione | Extraction of lactic acid |
US3284495A (en) * | 1962-04-26 | 1966-11-08 | Knapsack Ag | Process for the continuous manufacture, purification, and isolation of lactic acid |
EP3056490A1 (en) | 2015-02-13 | 2016-08-17 | PURAC Biochem BV | Method for manufacturing lactide |
US10017451B2 (en) | 2011-12-23 | 2018-07-10 | Purac Biochem B.V. | Lactic acid extraction |
US10683520B2 (en) | 2011-12-23 | 2020-06-16 | Purac Biochem Bv | Polycarboxylic acid extraction |
-
1927
- 1927-11-22 GB GB3134227A patent/GB280969A/en not_active Expired
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2710880A (en) * | 1953-05-07 | 1955-06-14 | Edward M Filachione | Extraction of lactic acid |
US3284495A (en) * | 1962-04-26 | 1966-11-08 | Knapsack Ag | Process for the continuous manufacture, purification, and isolation of lactic acid |
US10017451B2 (en) | 2011-12-23 | 2018-07-10 | Purac Biochem B.V. | Lactic acid extraction |
US10683520B2 (en) | 2011-12-23 | 2020-06-16 | Purac Biochem Bv | Polycarboxylic acid extraction |
US11299447B2 (en) | 2011-12-23 | 2022-04-12 | Purac Biochem B.V. | Method for isolating a carboxylic acid from an aqueous solution |
EP3056490A1 (en) | 2015-02-13 | 2016-08-17 | PURAC Biochem BV | Method for manufacturing lactide |
US10399956B2 (en) | 2015-02-13 | 2019-09-03 | Purac Biochem B.V. | Method for manufacturing lactide |
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