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:
Nov. 30, 2021
Filed:
Dec. 05, 2018
Zhejiang Lantian Environmental Protection Hi-tech Co., Ltd., Hangzhou, CN;
Zhejiang Research Institute of Chemical Industry Co., Ltd., Hangzhou Zhejiang, CN;
Sinochem Lantian Co., Ltd., Hangzhou, CN;
Wanjin Yu, Hangzhou, CN;
Shengda Lin, Hangzhou, CN;
Minyang Liu, Hangzhou, CN;
Wucan Liu, Hangzhou, CN;
Jianjun Zhang, Hangzhou, CN;
Xianjin Chen, Hangzhou, CN;
Zhejiang Lantian Environmental Protection Hi-Tech Co., Ltd., Hangzhou, CN;
Zhejiang Research Institute of Chemical Industry Co., Ltd., Hangzhou, CN;
Sinochem Lantian Co., Ltd., Hangzhou, CN;
Abstract
The present invention discloses a method for preparing 2,3-dichloro-5-trifluoromethylpyridine, comprising at a temperature of 100˜150° C. and a pressure of 0.5˜5.0 MP, in presence of at least one catalyst selected from supported metal chloride, supported zeolite molecular sieve and supported heteropolyacid, 2-chloro-5-trifluoromethylpyridine reacts with chlorine gas to obtain 2,3-dichloro-5-trifluoromethylpyridine. The preparing method provided by the present invention has advantages such as high selectivity of desired product, high utilization rate of chlorine gas, moderate process condition, simple operation and less three wastes. The present invention also discloses a preparing method for preparing 2-chloro-5-trifluoromethylpyridine, which is capable of reducing unit consumption, reducing separation cost, and improving safety compared to the prior art.