Process for preparing isocyanates

Details Process for preparing isocyanates Process for preparing isocyanates

1992-03-16

1993-02-23

Dees, Jose G.

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

Organic compounds

Isocyanate esters

560338, 562123, 562507, 562550, 562555, C07C26304

Patent

active

051892057

ABSTRACT:
A process for preparing isocyanates comprising (a) contacting carbon dioxide and a primary amine in the presence of an aprotic organic solvent and an organic, nitrogenous base to produce the corresponding ammonium carbamate salt, and (b) reacting the ammonium carbamate salt with an electrophilic or oxophilic dehydrating agent to produce the corresponding isocyanate. A second embodiment comprises recovering the ammonium carbamate salt of step (a) prior to reacting the ammonium carbamate salt with an electrophilic or oxophilic dehydrating agent in the presence of an aprotic organic solvent and an organic, nitrogenous base.

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Belforte et al., Chem. Ber. 121, 1891-1897, (1988).
Y. Hori et al., Chemistry Express, 1 (4), 224-227, (1986).

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