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:
Sep. 04, 1979
Filed:
Jan. 23, 1978
Thomas H Colby, Houston, TX (US);
Ernest R Freitas, Houston, TX (US);
William R Durland, Houston, TX (US);
Shell Oil Company, Houston, TX (US);
Abstract
An improved process is disclosed for the preparation of 2-chloro-4-ethylamino-6-isopropylamino-s-triazine wherein two of the three chlorine atoms on cyanuric chloride are replaced with ispropylamino and ethylamino substituents by sequential reaction of cyanuric chloride in a mixed acetone/water solvent system with isopropylamine and ethylamine, respectively, in the presence of an alkali metal hydroxide acid acceptor. In this improved process, the formation of undesired 2-chloro-4,6-bis(ethylamino)- and 2-chloro-4,6-bis(isopropylamino)-s-triazine impuritiesis minimized by carrying out the initial chloride replacement reaction with an excess of cyanuric chloride over the stoichiometric amount and subsequently treating the reaction product from this initial chlorine replacement reaction with sufficient base to convert the unreacted cyanuric chloride to a water soluble basic salt of monohydroxydichloro-s-triazine followed, optionally and preferably, by phase separation of the aqueous solvent phase to remove at least a portion of the basic salt of monohydroxydichloro-s-triazine from the reaction mixture prior to the second chlorine replacement reaction.