Patent ID: 9000219
Filing Date: 2015-04-07
Classification: C07C

Abstract:
1. A method for treating isocyanate residues, comprising: blending carbonate with the isocyanate residues which are obtained by separating isocyanate and alcohol from a decomposition solution resulting from thermal decomposition reaction of carbamate produced by reaction of raw material amine, urea and/or N-unsubstituted carbamic acid ester, and alcohol, and decomposing the isocyanate residues blended with the carbonate through contact with high pressure and high temperature water having a pressure of 3 to 30 MPa and a temperature of 190 to 350°C. to obtain recovered amine and alcohol, wherein the carbonates is obtained by further roughly separating from low-boiling components containing carbonate separated after the carbamate formation reaction.