| abstract |
In the method for treating an isocyanate residue of the present invention, isocyanate is obtained from a decomposition solution obtained by a pyrolysis reaction of a carbamate produced by the reaction of an amine, urea and / or N-unsubstituted carbamic acid ester, and an alcohol. The isocyanate residue from which the anate and the alcohol are separated is contacted with high pressure hot water to decompose into an amine. Further, in the method for treating carbonate of the present invention, the carbonate is decomposed into alcohol by contacting high pressure hot water. |