Process for the preparation of aromatic isocyanates from dialkyl

Details Process for the preparation of aromatic isocyanates from dialkyl Process for the preparation of aromatic isocyanates from dialkyl

1989-02-02

1989-11-28

Siegel, Alan

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

Organic compounds

Isocyanate esters

C07C 6900

Patent

active

048839086

ABSTRACT:
An improved process is provided for the preparation of aromatic mono- and poly-isocyanates by the thermal decomposition of an aromatic bis dialkyl urea in solvent in the presence of an organic sulfonic acid or sulfonated aromatic ion exchange resin as a promoter for conversion of the urea groups to isocyanates.

REFERENCES:
patent: 3898259 (1975-08-01), Hearsey
patent: 3936484 (1976-02-01), Rosenthal et al.
patent: 4153624 (1979-05-01), Fern et al.
patent: 4223145 (1980-09-01), Hentschel et al.
patent: 4596679 (1986-06-01), Hellbach et al.

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