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:
Oct. 26, 2021
Filed:
May. 29, 2020
Cathay Biotech Inc., Shanghai, CN;
Cibt America Inc., Newark, DE (US);
Cathay (Jinxiang) Biomaterial Co., Ltd., Shandong, CN;
Chen Yang, Shanghai, CN;
Bingbing Qin, Shanghai, CN;
Yufeng Yang, Shanghai, CN;
Kai Wang, Shanghai, CN;
Xiucai Liu, Shanghai, CN;
Cathay Biotech Inc., Shanghai, CN;
CIBT America Inc., Newark, DE (US);
Cathay (Jinxiang) Biomaterial Co., Ltd., Shandong, CN;
Abstract
The present disclosure provides a method and a system for refining long chain dicarboxylic acid, said method comprising the following steps: (1) subjecting a long chain dicarboxylic acid fermentation broth or a treated liquid therefrom to a membrane filtration, an acidification/crystallization, a solid-liquid separation and drying to give a long chain dicarboxylic acid crude product; (2) subjecting the long chain dicarboxylic acid crude product to a vacuum distillation to give the long chain dicarboxylic acid product; wherein the pressure in the vacuum distillation is ≤100 Pa. By using the refining method according to the present disclosure, the procedure is simplified, and the purity of the obtained product is high, and the disadvantages such as poor quality of the product obtained by crystallization from a solvent and environment pollution caused by a solvent can be overcome.