Process for preparing alkyl isocyanates

Details Process for preparing alkyl isocyanates Process for preparing alkyl isocyanates

1984-05-10

1985-04-30

Siegel, Alan

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 6900

Patent

active

045143390

ABSTRACT:
Process for the production of alkyl isocyanates which can be defined by the general formula: R--N.dbd.C.dbd.O wherein R is an alkyl radical having from 1 to 4 carbon atoms by thermal decomposition of phenyl-N-alkyl urethans which can be defined by the general formula: ##STR1## wherein R has the above defined meaning. Said thermal decomposition is carried out without any substance having a catalytic activity being present in the decomposition reaction, by heating to a temperature of from 180.degree. C. to 210.degree. C. under the atmospherical pressure or a slightly reduced pressure, a mixture of phenol and phenyl-N-alkyl urethan, in a molar ratio of the former to the latter equal to or nearly equal to 1:1, removing by vaporization the phenol and the alkyl isocyanate from said vaporized products and maintaining in the reaction mixture, substantially throughout the thermal decomposition a molar ratio of phenol to phenyl-N-alkyl urethan not lower than about 1:1.

REFERENCES:
patent: 2409712 (1946-10-01), Schweitzer
patent: 3366662 (1968-01-01), Kober et al.
patent: 3919278 (1975-11-01), Rosenthal et al.

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