Process for preparing alkyl isocyanates

Details Process for preparing alkyl isocyanates Process for preparing alkyl isocyanates

1977-09-22

1978-10-31

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260463, 560132, C07C11800

Patent

active

041234502

ABSTRACT:
Alkylisocyanates are prepared by reacting a phenol or substituted phenol and phosgene in a halogenated hydrocarbon solvent with aqueous alkali metal hydroxide to produce a corresponding chloroformate, reacting the resulting chloroformate solution with aqueous alkylamine to give a corresponding N-alkylcarbamate which, after solvent is stripped, is then pyrolyzed to yield the alkyl isocyanate. Solvent and the starting phenol may be recovered and recycled to the process.

REFERENCES:
patent: 2409712 (1946-10-01), Schweitzer
patent: 3076007 (1963-01-01), Barclay, Jr. et al.
patent: 3202573 (1965-08-01), Haubein
patent: 3734941 (1973-05-01), Sydor
patent: 3919279 (1975-11-01), Rosenthal et al.
patent: 4003938 (1977-01-01), Koenig et al.
Strain et al., JACS, vol. 72, p. 1254 (1950).
Crosby et al., JACS, vol. 76, p. 4458 (1954).
Kirk-Othmer Encyclopedia of Chemical Technology, 2nd Ed., vol. 12, p. 54, Interscience, 1967.
Jacobi et al., Chemical Abstracts, vol. 53, 22718d (1959).

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