Beneficial use of water in catalytic conversion of formamides to isocyanates
AssigneeE. I. DuPont de Nemours and Company
InventorVelliyur N. M. Rao
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Abstract
Water is fed together with formamide in vapor form in the production of isocyanates by silver-catalyzed oxidative dehydrogenation of formamides.
Claims6
An improved process for preparing isocyanates of the formula R--NCO, wherein R is C.sub.1-3 alkyl, by reacting a corresponding formamide of the formula R-NHCHO with oxygen or an oxygen-containing gas at a temperature from about 400.degree. C. to about 800.degree. C., in the presence of a silver catalyst, wherein the improvement comprises feeding water and formamide in vapor form to provide a reaction feed mixture having a mole ratio of water to formamide from about 0.1 to about 10.0.
Dependencies are inferred from the claim text.