The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 07, 2002
Filed:
May. 22, 2001
Applicant:
Inventors:
Eric Dubois, Lestrem, FR;
Catherine Fouache, Sailly/Labourse, FR;
Assignee:
Roquette Freres, Lestrem, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C 5/908 ;
U.S. Cl.
CPC ...
C07C 5/908 ;
Abstract
The invention relates to a process for the preparation of high purity lactic acid from an aqueous solution containing said acid in the form of salt(s), characterised in that the aqueous solution is treated with a strong acid in order to liberate lactic acid in the free form and to produce salts of the corresponding strong acid, said salts of the strong acid are crystallised by evaporative crystallisation and lactic acid is recovered in the free form in solution.