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:
Jun. 16, 2020
Filed:
Dec. 25, 2009
Kenji Sawai, Kamakura, JP;
Hideki Sawai, Kamakura, JP;
Takashi Mimitsuka, Kamakura, JP;
Ito Masateru, Kamakura, JP;
Katsushige Yamada, Kamakura, JP;
Kenji Kawamura, Kamakura, JP;
Shin-ichi Minegishi, Otsu, JP;
Izumi Nakagawa, Kamakura, JP;
Tatsuya Nagano, Nagoya, JP;
Kenji Sawai, Kamakura, JP;
Hideki Sawai, Kamakura, JP;
Takashi Mimitsuka, Kamakura, JP;
Ito Masateru, Kamakura, JP;
Katsushige Yamada, Kamakura, JP;
Kenji Kawamura, Kamakura, JP;
Shin-ichi Minegishi, Otsu, JP;
Izumi Nakagawa, Kamakura, JP;
Tatsuya Nagano, Nagoya, JP;
Toray Industries, Inc., Tokyo, JP;
Abstract
Lactic acid is obtained by a method including (A) a step of continuous fermentation wherein a fermentation culture medium of a microorganism having an ability of lactic acid fermentation is filtered through a porous membrane having an average pore size of not less than 0.01 μm and less than 1 μm with a transmembrane pressure difference within the range of 0.1 to 20 kPa, and the permeate is collected, while retaining the non-permeated liquid in or returning the non-permeated liquid to the culture, and adding a fermentation feedstock to the culture; (B) a step of filtering the permeate obtained in Step (A) through a nanofiltration membrane; and (C) a step of distilling the permeate obtained in Step (B) under a pressure of not less than 1 Pa and not more than atmospheric pressure, at 25° C. to 200° C. to recover lactic acid.