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Title:
PROCESS FOR PRODUCING ISOCYANATE USING DIARYL CARBONATE
Document Type and Number:
WIPO Patent Application WO/2009/139061
Kind Code:
A1
Abstract:
This invention provides a production process which, in producing an isocyanate without using phosgene, is free from various problems as seen in the prior art and can stably produce the isocyanate at a high yield for a long period of time. The production process comprises the step of reacting diaryl carbonate with an amine compound in the presence of an aromatic hydroxy compound as a reaction solvent to give a reaction mixture containing an aryl carbamate containing a diaryl carbonate-derived aryl group, a diaryl carbonate-derived aromatic hydroxy compound, and a diaryl carbonate, the step of transferring the reaction mixture to a thermal decomposition reactor, and the step of thermally decomposing the aryl carbamate to give an isocyanate. In this production process, the reactor for reacting the diaryl carbonate with the amine compound is different from the reactor for thermal decomposition of the aryl carbamate.

Inventors:
SHINOHATA MASAAKI (JP)
MIYAKE NOBUHISA (JP)
Application Number:
PCT/JP2008/058944
Publication Date:
November 19, 2009
Filing Date:
May 15, 2008
Export Citation:
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Assignee:
ASAHI KASEI CHEMICALS CORP (JP)
SHINOHATA MASAAKI (JP)
MIYAKE NOBUHISA (JP)
International Classes:
C07C265/14; C07C263/04; C07C269/04; C07C271/54
Domestic Patent References:
WO2005000783A12005-01-06
WO2005111049A12005-11-24
WO2003055840A12003-07-10
WO2004014840A12004-02-19
Foreign References:
JPS61183257A1986-08-15
JP2004262835A2004-09-24
JPH0656984A1994-03-01
JPH06192204A1994-07-12
US3992430A1976-11-16
JPS5271443A1977-06-14
JPS61183257A1986-08-15
DE925496C1955-03-24
JPH10316645A1998-12-02
JPS52136147A1977-11-14
JP2004262834A2004-09-24
JPH01230550A1989-09-14
US4290970A1981-09-22
US2692275A1954-10-19
US3734941A1973-05-22
US4081472A1978-03-28
US4388426A1983-06-14
US4482499A1984-11-13
US4613466A1986-09-23
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US4388246A1983-06-14
US4692550A1987-09-08
JP2004262835A2004-09-24
Other References:
BERCHTE DER DEUTECHEN CHEMISCHEN GESELLSCHAFT, vol. 3, pages 653
JOURNAL OF AMERICAN CHEMICAL SOCIETY, vol. 81, 1959, pages 2138
JOURNAL OF POLYMER SCIENCE, POLYMER CHEMISTRY EDITION, vol. 17, 1979, pages 835
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, vol. 64, 1942, pages 2229
Attorney, Agent or Firm:
INABA, Yoshiyuki et al. (JP)
Yoshiyuki Inaba (JP)
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