Preparation of diphenylmethane dicarbamates and...

Details Preparation of diphenylmethane dicarbamates and... Preparation of diphenylmethane dicarbamates and...

B - Operations, Transporting

01

J

260/468.8

B01J 27/08 (2006.01)

Patent

CA 1136156

PREPARATION OF DIPHENYLMETHANE DICARBAMATES AND POLYMETHYLENE POLYPHENYL CARBAMATES WITH LEWIS ACID CATALYSTS INTERCALATED IN GRAPHITE ABSTRACT OF THE DISCLOSURE Diphenylmethane dicarbamates and polymethylene polyphenyl carbamate homologs and derivatives of these compounds are produced by the condensation of N-aryl carbamic acid esters, such as ethylphenylcarbamate, with a carbonyl compound selected from formaldehyde, para-formaldehyde or trioxane at a temperature of between about ambient and 170°C. in the presence of a Lewis acid intercalated in graphite and optionally in the presence of an inert solvent.

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