Process for producing an aliphatic isocyanate

Details Process for producing an aliphatic isocyanate Process for producing an aliphatic isocyanate

1985-04-10

1986-05-06

Torrence, Dolph H.

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

Organic compounds

Isocyanate esters

560 24, 560352, C07C11800

Patent

active

045870560

ABSTRACT:
A process for producing an aliphatic isocyanate from an aliphatic primary amine comprising a carbonylation step in which an aliphatic primary amine is allowed to react with carbon monoxide at a temperature of about 100.degree.-250.degree. C. in the presence of an aromatic hydroxyl compound having a pKa value of not more than about 11, molecular oxygen and a catalyst system comprising at least one member selected from palladium and rhodium metals and components thereof and at least one member selected from iodine and bromine and compounds thereof and a combined separation and recovery step comprising a pyrolysis-distillation reaction in which the mixture of carbonylated products is heated to a temperature of from about 100.degree. to 300.degree. C.

REFERENCES:
patent: 3641092 (1972-02-01), Henry
patent: 3734941 (1973-05-01), Sydor
patent: 4003938 (1977-01-01), Koenig et al.
patent: 4195031 (1980-03-01), Reichmann et al.
patent: 4386033 (1983-05-01), Konig et al.
patent: 4388246 (1983-06-01), Sundermann et al.
Chemical Communications, No. 22, pp. 828-829 (1966).
Journal of Organic Chemistry, 31, 596-597 (1966).

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