Title:
METHOD FOR PRETREATMENT FOR PRODUCTION OF ISOCYANATE MIXTURE
Document Type and Number:
WIPO Patent Application WO/2010/021334
Kind Code:
A1
Abstract:
Disclosed is a method for pretreatment for the production of an isocyanate mixture. In the method, the following treatment is carried out before the production of an isocyanate mixture (G) by a process comprising a reaction step of reacting an amine mixture (E) with phosgene (F) to synthesize an isocyanate mixture, a concentration step of concentrating the reaction step liquid containing the isocyanate mixture. In the pretreatment, an acidic material (C) and pretreatment media (A) and (B) are introduced into a production process system. The mixture is circulated within at least one of the reaction step system and the concentration step system and is then discharged to the outside of the production process system. The pretreatment method is useful for the production of an isocyanate mixture in which the amount of metals including iron mixed therein, which affects the reactivity of the isocyanate mixture is small.
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Inventors:
WAKABAYASHI YASUTAKE (JP)
Application Number:
PCT/JP2009/064490
Publication Date:
February 25, 2010
Filing Date:
August 19, 2009
Export Citation:
Assignee:
NIPPON POLYURETHANE KOGYO KK (JP)
WAKABAYASHI YASUTAKE (JP)
WAKABAYASHI YASUTAKE (JP)
International Classes:
C07C263/18; C07C263/10; C07C265/14
Foreign References:
| JP2006160684A | 2006-06-22 | |||
| JPH0899946A | 1996-04-16 | |||
| JPH10306068A | 1998-11-17 |
Attorney, Agent or Firm:
KOJIMA, TAKASHI (JP)
Takashi Kojima (JP)
Takashi Kojima (JP)
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