Process for preparing alkyl isocyanates

Details Process for preparing alkyl isocyanates Process for preparing alkyl isocyanates

C - Chemistry, Metallurgy

07

C

260/456.5

C07C 69/00 (2006.01) C07C 249/00 (2006.01) C07C 263/00 (2006.01)

Patent

CA 1218669

IMPROVED PROCESS FOR PREPARING ALKYL ISOCYANATES Abstract Process for the production of alkyl isocyanates which can be defined by the general formula: R-N=C=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: Image 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°C to 210°C under the atmospherical pressure or a slighly 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.

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