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AssigneeMitsui Chemicals, Inc.
InventorsYoshiki Shimokawatoko, Koichi Murayama, Hiroshi Takeuchi, Takashi Kanno, Masaaki Sasaki, Kazuhiko Okubo
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A method for treating an isocyanate residue, which comprises carrying out a thermal decomposition reaction of a carbamate that is produced by the reaction among an amine, urea and/or an N-unsubstituted carbamic acid ester and an alcohol to produce a decomposition solution, separating an isocyanate and the alcohol from the decomposition solution to produce the isocyanate residue, and bringing the isocyanate residue into contact with high-pressure/high-temperature water to decompose the isocyanate residue into an amine; and a method for treating a carbonate, which comprises bringing the carbonate into contact with high-pressure/high-temperature water to decompose the carbonate into an alcohol.
A method for treating isocyanate residues, comprising:
A method for treating carbonates, comprising decomposing at least one carbonate selected from the group consisting of dialkyl carbonate, diaryl carbonate, and alkyl aryl carbonate into alcohol by contact with high pressure and high temperature water having a pressure of 3 to 30 MPa and a temperature of 190 to 350°C., the carbonate being obtained by carbamate formation reaction of raw material amine, urea and/or N-unsubstituted carbamic acid ester, and alcohol,
Dependencies are inferred from the claim text.