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. 05, 2020
Filed:
Sep. 05, 2014
Applicant:
Toray Industries, Inc., Tokyo, JP;
Inventors:
Kenji Kawamura, Kamakura, JP;
Miyuki Horiguchi, Kamakura, JP;
Satoshi Sakami, Kamakura, JP;
Katsushige Yamada, Kamakura, JP;
Assignee:
Toray Industries, Inc., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 51/42 (2006.01); C07C 51/44 (2006.01); C07C 51/47 (2006.01); B01D 61/02 (2006.01); C07C 51/43 (2006.01); C08G 63/06 (2006.01); C12P 7/56 (2006.01);
U.S. Cl.
CPC ...
C07C 51/44 (2013.01); B01D 61/027 (2013.01); C07C 51/43 (2013.01); C07C 51/47 (2013.01); C08G 63/06 (2013.01); C12P 7/56 (2013.01);
Abstract
A method of producing lactic acid includes filtering a lactic acid-containing aqueous solution through a nanofiltration membrane to recover an aqueous lactic acid solution from the permeate side (Step A); distilling the aqueous lactic acid solution to recover lactic acid from the vapor side (Step B); and crystallizing the lactic acid obtain in Step B, and performing solid-liquid separation to recover a lactic acid crystal(s) (Step C).