Patent ID: 6781010
Filing Date: 2004-08-24
Classification: C07C

Abstract:
A process for the preparation of organic isocyanates, said process comprising:a) forming a reaction mixture by mixing an organic formamide compound or its amine and formate precursors with at least one diorganocarbonate selected from the group consisting of diarylcarbonates, mixed aliphatic/aryl-carbonates and cycloalphatic/aryl-carbonates; b) subjecting said reaction mixture to an elevated temperature sufficient to generate the isocyanate corresponding to said organic formamide compound; and c) isolating said isocyanate from said reaction mixture; wherein said organic formamide compound is one of the formulaR&Parenopenst;NHCHO)n where n is an integer from 1 to 10 and R is an organic radical.