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:
Jun. 10, 1980
Filed:
Aug. 11, 1978
Rezso Csikos, Veszprem, HU;
Zoltan Decsy, Veszprem, HU;
Zeno Trocsanyi, Veszprem, HU;
Zsolt Varga, Veszprem, HU;
Zsuzsa Wittman, Veszprem, HU;
Magyar Asvanyolaj es Foldgaz Kiserleti Intezet, Veszprem, HU;
Abstract
The invention relates to a process for preparing o-phenylenediamine. According to the invention 1,4-dichlorobenzene is nitrated to give 2,5-dichloro-nitrobenzene which is then reacted with an aqueous ammonium hydroxide solution and the 4-chloro-2-nitraniline obtained is subjected to catalytic hydrogenation to afford the end product which can thereafter be separated. The process according to the invention can be accomplished with a total yield of about 90% related to the 1,4-dichlorobenzene starting compound. o-Phenylenediamine is a valuable intermediate for instance in the synthesis of plant protecting agents and heat-resistant polymers.