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:
Apr. 06, 1982
Filed:
Oct. 22, 1980
Applicant:
Inventor:
Harald Knorr, Gersthofen, DE;
Assignee:
Hoechst Aktiengesellschaft, Frankfurt, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
564151 ;
Abstract
The invention provides an improved process for the preparation of N,N'-diformylhydrazine of the formula ##STR1## from the hydrazine hydrate and formamide, which comprises operating in two temperature steps and under reduced pressure in order to remove rapidly the ammonia formed from the system. A very pure product is obtained in a yield of above 95%, relative to hydrazine hydrate.