Purification of organic isocyanates

Details Purification of organic isocyanates Purification of organic isocyanates

1975-06-02

1977-12-27

Yudkoff, Norman

Distillation: processes, separatory

Adding material to distilland except water or steam per se

Organic compound

203 59, 203 65, 203 60, 260453SP, 203 38, B01D 334

Patent

active

040653625

ABSTRACT:
The present invention provides a process for purifying an organic isocyanate which comprises heating an organic isocyanate in admixture with a treating agent selected from the group consisting of a metal salt of mercaptobenzothiazol, a dithiocarbamic acid derivative, an alkyl-substituted phenol, a thio-bisphenol, and a triaryl phosphite at a temperature not lower than 100.degree. C and subsequently distilling the thusly treated mixture to recover a purified organic isocyanate.

REFERENCES:
patent: 2957903 (1960-10-01), Spiegler
patent: 3055078 (1962-05-01), DeLong et al.
patent: 3458558 (1969-07-01), Cheng
patent: 3660456 (1972-05-01), Naito et al.
patent: 3715381 (1973-02-01), Spaunburgh et al.

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