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Title:
METHOD FOR TREATING CATALYST
Document Type and Number:
Japanese Patent JP2011162442
Kind Code:
A
Abstract:

To provide a method for treating a catalyst that reduces a production cost of an isocyanate while permitting industrially efficient production of the isocyanate.

A primary amine, urea and/or an N-unsubstituted carbamic acid ester and an alcohol are caused to react in the presence of a catalyst to give a carbamate followed by a thermal decomposition reaction of the carbamate to give an isocyanate and a residue, and subsequently the catalyst is recovered from the residue. The method for treating a catalyst permits the recovery of the catalyst used in the production process of the carbamate after the thermal decomposition process and therefore reduces a production cost of the isocyanate while permitting industrially efficient production of the isocyanate.


Inventors:
SHIMOKAWADOKO SHOKI
SUGANO TAKASHI
MURAYAMA KOICHI
TAKEUCHI HIROSHI
Application Number:
JP2010023108A
Publication Date:
August 25, 2011
Filing Date:
February 04, 2010
Export Citation:
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Assignee:
MITSUI CHEMICALS INC
International Classes:
C07C263/04; B01J31/02; B01J38/00; C07C265/14; C07B61/00; C07C269/04; C07C271/28
Domestic Patent References:
JPS55149241A1980-11-20
JP2005068147A2005-03-17
JPS5219624A1977-02-15
JPH07258194A1995-10-09
JPH0625136A1994-02-01
JPS57114561A1982-07-16
JPS57158747A1982-09-30
JPS5186419A1976-07-29
JPS55149241A1980-11-20
JP2005068147A2005-03-17
JPS5219624A1977-02-15
JPH07258194A1995-10-09
Foreign References:
WO2010110142A12010-09-30
WO2010110142A12010-09-30
Attorney, Agent or Firm:
Hiroyuki Okamoto



 
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