Process for the production of isocyanates and for the continuous

Details Process for the production of isocyanates and for the continuous Process for the production of isocyanates and for the continuous

1994-05-23

1995-08-29

Dees, Jose G.

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

Organic compounds

Isocyanate esters

C07C 7100

Patent

active

054461960

ABSTRACT:
Pure isocyanate is recovered from an isocyanate-containing residue of a phosgene/amine reaction mixture by continuously feeding such residue and a high boiling hydrocarbon such as bitumen to a heated vacuum drier with a horizontal shaft. The contents of the drier are subjected to temperatures of from about 160.degree. to about 280.degree. C. and pressures of from about 2 to about 50 mbar. Pure isocyanate and a pourable, non-dusting, granular material are recovered.

REFERENCES:
patent: 2889257 (1959-06-01), Griffin et al.
patent: 3457291 (1969-07-01), Baylor
patent: 3687422 (1972-08-01), List
patent: 3971793 (1976-07-01), Fauran et al.
patent: 4216063 (1980-08-01), Ailloud et al.
patent: 4289589 (1981-09-01), Koehler et al.
patent: 5043470 (1991-08-01), Dibase et al.
Ullmanns Encyklopadie der technischen Chemie, Fourth Edition, vol. 13, pp. 347-357, Verlag Chemie GmbH, D-69469 Weinheim, 1977.

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