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Title:
METHOD FOR MANUFACTURING TOLYLENE DIISOCYANATE
Document Type and Number:
Japanese Patent JP2012240953
Kind Code:
A
Abstract:

To provide a method for manufacturing tolylene diisocyanate by which the tolylene diisocyanate containing 2,4-tolylene diisocyanate and 2,6-tolylene diisocyanate in a desired isomeric ratio can be manufactured.

The method for manufacturing the tolylene diisocyanate containing 2,4-tolylene diisocyanate and 2,6-tolylene diisocyanate in the target isomeric ratio comprises mixing a first diaminotoluene containing 2,4- and 2,6-diaminotoluene in a first isomeric ratio with a second diaminotoluene containing 2,4- and/or 2,6-diaminotoluene in a second isomeric ratio different from the first isomeric ratio, reacting the mixed diaminotoluene, urea and/or N-unsubstituted carbamate, and an alcohol to afford tolylene dicarbamate, and pyrolyzing the tolylene dicarbamate.


Inventors:
TAKAMATSU KOJI
KOKADO KAZUHIRO
FUKUDA TAKESHI
SASAKI SUKEAKI
Application Number:
JP2011111786A
Publication Date:
December 10, 2012
Filing Date:
May 18, 2011
Export Citation:
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Assignee:
MITSUI CHEMICALS INC
International Classes:
C07C263/04; C07C265/14
Domestic Patent References:
JPS5665858A1981-06-03
JPH02101057A1990-04-12
JPH10507738A1998-07-28
JPH10279539A1998-10-20
JPH09151270A1997-06-10
JPS5665858A1981-06-03
JPH02101057A1990-04-12
JPH10507738A1998-07-28
JPH10279539A1998-10-20
JPH09151270A1997-06-10
Attorney, Agent or Firm:
Hiroyuki Okamoto



 
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