Process for purification of waste waters from aromatic amines

Details Process for purification of waste waters from aromatic amines Process for purification of waste waters from aromatic amines

1980-10-17

1982-04-13

Castel, Benoit

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210903, C02F 154

Patent

active

043246672

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.

REFERENCES:
patent: 3144474 (1964-08-01), Kantyka et al.
Sugh A. et al., Chem. Pharm. Bull., vol. 27, No. 4, pp. 1042-1044, (Apr. 1979).
Chem. Abstracts, vol. 92:163689v, "Recovery of Amines".

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