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. 13, 1982
Filed:
Oct. 17, 1980
Igor I Konstantinov, Dzerzhinsk, SU;
Antonina I Kormushechkina, Dzerzhinsk, SU;
Jury A Avdonin, Dzerzhinsk, SU;
Vladimir M Kotlyarsky, Dzerzhinsk, SU;
Albert A Kim, Dzerzhinsk, SU;
Nikolai V Obraztsov, Dzerzhinsk, SU;
Alexei V Efimov, Dzerzhinsk, SU;
Other;
Abstract
The present invention relates to chemical processes for purification of industrial waste waters from aromatic amines. The process of the invention is characterized in that into waste waters aromatic di- or polyisocyanates are introduced in a molar ratio with aromatic amines ranging from 1:1 to 30:1 respectively. The resulting precipitate is separated from the purified waste waters. The aromatic isocyanates can be introduced into waste waters as solutions in inert organic solvents. The process of this invention can be useful in processes for the production of aromatic amines and derivatives thereof, for example aromatic isocyanates.