Process for the preparation of organic isocyanates

Details Process for the preparation of organic isocyanates Process for the preparation of organic isocyanates

1994-02-04

1995-09-12

Dees, Jose G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Isocyanate esters

C07C26304

Patent

active

054498171

ABSTRACT:
The preparation of organic isocyanates of formula by the thermal decomposition of the corresponding carbamates in an inert solvent, is improved by thermally treating the dissolved carbamate in separate steps, decomposing the carbamate to isocyanate and alcohol, with intermediate steps of removing the alcohol with an inert stripping agent, recovering a solution rich in isocyanate.

REFERENCES:
patent: 3668250 (1972-06-01), Karafian
patent: 4341640 (1982-07-01), Landis
Chemical Abstracts, Fukuoka, 104: 207855, Nov. 25, 1985.
Patent Abstracts of Japan, vol. 19, No. 107 (C-341) 1986 & JP-A-60 237 058 (Asahi Kasei Kogyo KK) Abstract.
Patent Abstracts of Japan, vol. 17, No. 37 (C-1019) 25 Jan. 1993 & JP-A-04 253 951 (Asahi Chem Ind Co. Ltd.) Abstract.

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