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. 30, 1980
Filed:
Dec. 29, 1978
Hermann D Krall, Meerbusch, DE;
Herbert Schwarz, Leverkusen, DE;
Bayer Aktiengesellschaft, Leverkusen, DE;
Abstract
In the preparation of perchloro-2,5-diaza-1,5-hexadiene by chlorination of N,N-dimethylaminoacetonitrile, the improvement which comprises in a first stage (a) chlorinating N,N-dimethylaminoacetonitrile or its hydrochloride at about 70.degree. to 80.degree. C. in a solvent, removing the solvent by distillation under chlorinating conditions until a bottom temperature of about 120.degree. to 160.degree. is reached, and after-treating the residual reaction at this temperature with chlorine, and in a second stage (b) chlorinating the resulting reaction mixture at a temperature from about 150.degree. to 220.degree. C. Advantageously the solvent in stage (a) is phosphorus oxychloride, the weight ratio of nitrile to solvent is about 1:3, the after-chlorination in stage (a) is carried out at a temperature from about 120.degree. to 140.degree. C., and stage (b) is carried out at a temperature from about 180.degree. to 210.degree. C. in a multi-stage bubble column cascade reactor operated with gas and liquid in counter-current.