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:
Jul. 25, 2023
Filed:
Nov. 24, 2020
Fudan University, Shanghai, CN;
Fener Chen, Shanghai, CN;
Dang Cheng, Shanghai, CN;
Meifen Jiang, Shanghai, CN;
Minjie Liu, Shanghai, CN;
Huashan Huang, Shanghai, CN;
Lulu Wang, Shanghai, CN;
Fudan University, Shanghai, CN;
Abstract
A method for preparing (dimethylaminomethylene) malononitrile by using a micro reaction system. Cyanoacetamide, N,N-dimethylformamide and a catalyst are mixed to obtain a mixture, and the mixture and phosphorus oxychloride are simultaneously pumped into the micro reaction system that includes a micromixer and a microchannel reactor connected in series for continuous dehydration condensation. After adjusted to a target pH, the crude product is subjected to continuous liquid-liquid extraction with an organic solvent in a centrifugal extraction unit comprising a plurality of annular centrifugal extractors connected in series. The organic phase is collected to obtain the target product (dimethyl aminomethylene) malononitrile.