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. 10, 2024
Filed:
May. 21, 2019
Asymchem Laboratories (Tianjin) Co., Ltd., Tianjin, CN;
Hao Hong, Morrisville, NC (US);
Jiangping Lu, Tianjin, CN;
Enxuan Zhang, Tianjin, CN;
Wei Shen, Tianjin, CN;
Honglei Yan, Tianjin, CN;
Zhen Zhang, Tianjin, CN;
ASYMCHEM LABORATORIES (TIANJIN) CO., LTD., Tianjin, CN;
Abstract
Provided is a preparation process of diazomethane. The preparation process includes: step S1, taking N-methylurea as a raw material to continuously prepare, in a continuous reactor, a first product system containing N-methyl-N-nitrosourea: step S2, performing continuous extraction and continuous back-extraction on the first product system to obtain an N-methyl-N-nitrosourea solution; step S3, enabling the N-methyl-N-nitrosourea solution to continuously react with an alkaline solution in a continuous reactor to obtain a second product system containing the diazomethane; and step S4, performing continuously liquid separation, water freezing and removal on the second product system, to obtain the diazomethane.