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Patents Assigned to Hoechst Aktiengesellschat

Processes for the preparation of nitrosamine-free N,N-disubstituted nitroaromatic amines and for the stabilization of these compounds against the formation of nitrosamines

Patent number: 4638090

Abstract: Processes for the preparation of nitrosamine-free N,N-disubstituted nitroaromatic amines by degradation of their nitrosamine components formed during their preparation, and by stabilization of the products against renewed formation of nitrosamines, by treating the amines in liquid or molten form with a sulfonic acid, where necessary in the presence of inert organic solvents or diluents.

Type: Grant

Filed: December 12, 1984

Date of Patent: January 20, 1987

Assignee: Hoechst Aktiengesellschat

Inventors: Rudolf Heinrich, Konrad Albrecht