Catalytic oxidation of formamides to form isocyanates

Details Catalytic oxidation of formamides to form isocyanates Catalytic oxidation of formamides to form isocyanates

1978-07-10

1980-06-10

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260465D, 560 8, C07C11804

Patent

active

042072514

ABSTRACT:
This invention relates to a process for preparing isocyanates from formamides wherein a formamide corresponding to the formula R--NHCHO).sub.n, where R is an organic group and n is 1 or 2, is oxidized with an oxygen containing gas at a temperature in the range of 300.degree. C. to 600.degree. C. in the presence of a catalytic amount of copper and/or one or more metals of the Groups IB and VIII of the 5th and 6th period of the Periodic System of Elements to yield the corresponding isocyanate R (NCO).sub.n where R and n have the same meaning as above, and the resultant gaseous isocyanate containing reaction mixture is subjected to a separation process to separate the product isocyanate from water of reaction.

REFERENCES:
patent: 3099673 (1963-07-01), Kuhle
patent: 3277140 (1966-10-01), Donovan et al.
patent: 3929859 (1975-12-01), Callahan
patent: 3960914 (1976-06-01), Lyons
Fu et al., et al., J.C.S. Perkin I, pp. 2246-2250 (1974).

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