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. 28, 1998
Filed:
Jul. 19, 1996
Applicant:
Inventors:
Assignee:
Mitsubishi Gas Chemical Company, Inc., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C01B / ;
U.S. Cl.
CPC ...
423407 ;
Abstract
A preparation process of hydrazine hydrate is herein disclosed which comprises the step of hydrolyzing a ketazine in a distillation column to obtain hydrazine hydrate, a nonionic surface active agent having a polyoxyethylene group in its molecule and/or silicon dioxide being present in the distillation column. According to this process, in the hydrolytic distillation of the ketazine, flooding can be inhibited and thus a stable operation can be accomplished. As a result, hydrazine hydrate can economically advantageously be prepared.