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:
Dec. 09, 1997
Filed:
Sep. 19, 1996
Kao Corporation, Tokyo, JP;
Abstract
N,N-Dimethyl-N-alkylamine or -alkenylamine is prepared by reacting a higher alcohol and dimethylamine by passing hydrogen gas and dimethylamine into a reactor containing a catalyst for the reaction at a pressure of atmospheric pressure to 100 atm. at 150.degree. C. to 250.degree. C. and removing water produced in the reaction as a component of the mixed hydrogen and unreacted dimethylamine gas which is discharged from the reactor, wherein at the point in the reaction at which from 90 to 99% of the higher alcohol has reacted with dimethylamine, one of the following procedures is followed: i) the introduction of only dimethylamine gas into the reactor is stopped, and the reaction is allowed to continue at a temperature 20.degree. to 150.degree. C. lower than the reaction temperature recited above; ii) the introduction of only dimethylamine gas into the reactor is stopped while the temperature is decreased to a level of 20.degree. to 150.degree. C. lower than the temperature recited above, and the reaction is allowed to proceed at the reduced temperature; or iii) the introduction of only dimethylamine gas into the reactor is stopped immediately after decreasing the temperature to a level of 20.degree. to 150.degree. C. lower than the temperature recited above, and the reaction is allowed to continue at the reduced temperature.