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:
Sep. 28, 2021
Filed:
Aug. 27, 2019
Zhejiang Nhu Company Ltd., Shaoxing, CN;
Zhejiang University, Hangzhou, CN;
Shandong Nhu Amino Acid Co., Ltd., Weifang, CN;
Zhirong Chen, Zhejiang, CN;
Hong Yin, Zhejiang, CN;
Baishan Hu, Shaoxing, CN;
Zhengjiang Wang, Weifang, CN;
Zhixuan Wang, Weifang, CN;
Cong Chen, Weifang, CN;
Guisheng Qiu, Shaoxing, CN;
Qichuan Li, Shaoxing, CN;
Qingai Shi, Shaoxing, CN;
ZHEJIANG NHU CO., LTD., Shaoxing, CN;
ZHEJIANG UNIVERSITY, Hangzhou, CN;
SHANDONG NHU AMINO ACID CO., LTD., Weifang, CN;
Abstract
Provided by the present disclosure are a method and a device for preparing 2-hydroxy-4-methylthiobutyric acid and intermediates thereof; the intermediates for preparing 2-hydroxy-4-methylthiobutyric acid comprise 3-methylthiopropionaldehyde and 2-hydroxy-4-methylthiobutyronitrile. The method for preparing 2-hydroxy-4-methylthiobutyric acid provided by the present disclosure comprises: step (1), a step of reacting acrolein with methyl mercaptan to prepare 3-methylthiopropionaldehyde; step (2), a step of reacting 3-methylthiopropionaldehyde with hydrocyanic acid to prepare 2-hydroxy-4-methylthiobutyronitrile; and step (3), a step of hydrating 2-hydroxy-4-methylthiobutyronitrile by using sulfuric acid and then hydrolyzing to prepare 2-hydroxy-4-methylthiobutyric acid; wherein in steps (1), (2) and (3), the reaction status of the materials is detected online, and the proportions of the materials are controlled according to the detection results such that reactions are performed completely.