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:
Jan. 21, 1992
Filed:
Jul. 11, 1990
Tadashi Komiyama, Kanagawa, JP;
Hisaharu Kuboyama, Kanagawa, JP;
Takashi Jimbo, Kanagawa, JP;
Hiroyoshi Watanabe, Kanagawa, JP;
Shuichi Tokumoto, Kanagawa, JP;
Yumiko Endoh, Kanagawa, JP;
Eiichi Sugiyama, Kanagawa, JP;
Yoshitaro Naganuma, Kanagawa, JP;
Mitsui Toatsu Chemicals, Inc., Tokyo, JP;
Abstract
At least one of ammonia and ethylenediamine is reacted with monoethanolamine in the presence of a catalyst containing phosphoric acid or its condensate in order to prepare acyclic ethyleneamines, and the catalyst can be improved in performance and the life of the catalyst can be prolonged by feeding a phosphorus-containing material to a reaction system during the reaction. In addition, the catalyst having a deteriorated performance can be reactivated by adding the phosphorus-containing material to the catalyst.