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:
Feb. 16, 1988
Filed:
Aug. 19, 1985
Ronald L Shubkin, Baton Rouge, LA (US);
Duane C Hargis, Baton Rouge, LA (US);
Ethyl Corporation, Richmond, VA (US);
Abstract
An ethanolamine, preferably diethanolamine, is converted to triethylenediamine or 1,4-bis(2-hydroxyethyl)piperazine, or both by pyrolysis using a B-subgroup metal oxide such as titanium dioxide or zirconium dioxide, as catalyst. In addition it has also been discovered that 1,4-bis(2-hydroxyethyl)piperazine and N-(2-hydroxyethyl)piperazine can be converted in high yields and conversions into triethylenediamine by pyrolysis using the same type of catalyst. When using an ethanolamine as the feedstock and a Group IV-B metal oxide as the catalyst, the process usually results in the coproduction of triethylenediamine and 1,4-bis(2-hydroxyethyl)piperazine, and the latter can be recovered and used as a raw material for the production of additional triethylenediamine, as by recycle to the same reactor or as feedstock to an additional pyrolysis reactor.