GB280969A - Improved process for the purification of lactic acid - Google Patents

Improved process for the purification of lactic acid

Info

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
Application number
GB3134227A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB3134227A priority Critical patent/GB280969A/en
Publication of GB280969A publication Critical patent/GB280969A/en
Expired legal-status Critical Current

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.
GB3134227A 1927-11-22 1927-11-22 Improved process for the purification of lactic acid Expired GB280969A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (7)

* Cited by examiner, † Cited by third party
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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