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. 03, 1984
Filed:
Apr. 22, 1982
Applicant:
Inventor:
Edoardo Pallucca, Settimo Milanese, IT;
Assignee:
Oxon Italia S.P.A., Milan, IT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
568933 ;
Abstract
To obtain technical TRIFLURALIN with a nitrosoamine content not exceeding 1 ppm, for use as a herbicide, 1-chloro-2,6-dinitro-4-(trifluoromethyl) benzene (DINITRO-PCBT) is freed from nitrosating agents by a process in which DINITRO-PCBT is treated with an aqueous bisulphite solution having an SO.sub.2 concentration of between 1% and 5% at a pH of between 1 and 3, at a temperature of between 50.degree. and 100.degree. C. for a time of between 1 and 3 hours. The organic layer is then separated from the aqueous layer, and the acidity and last traces of the bisulphite solution are eliminated from the organic layer by means of an aqueous alkaline solution.