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Title:
METHOD FOR PRODUCING POLYISOCYANATE
Document Type and Number:
Japanese Patent JP2006248998
Kind Code:
A
Abstract:

To provide a method for producing a polyisocyanate by which the load on the environment can be reduced while effectively utilizing hydrogen chloride by-produced in a polyisocyanate production process.

Carbonyl chloride is produced by feeding additional chlorine and carbon monoxide to a reaction vessel 2 for producing the carbonyl chloride at a start-up operation between the start of the operation and the stable operation, and the polyisocyanate is produced at an isocyanate-forming reaction vessel 3 while by-producing hydrogen chloride gas. Reclaimed chlorine is produced by oxidizing the hydrogen chloride gas at a hydrogen chloride-oxidizing vessel 6. In the loadup operation thereafter, the carbonyl chloride is produced by feeding the additional chlorine, the reclaimed chlorine and the carbon monoxide to the reaction vessel 2 for producing the carbonyl chloride. Further, the polyisocyanate is produced at the isocyanate-forming reaction vessel 3 while by-producing the hydrogen chloride gas, and the reclaimed chloride is produced by oxidizing the hydrogen chloride gas at the hydrogen chloride-oxidizing vessel 6. The loadup operation is repeated until the production amount of the polyisocyanate achieves that at the stable operation.


Inventors:
NAITO TAKAO
TAKAHASHI HIRONORI
MAEBA KOJI
IMAIZUMI TSUGIO
SARUWATARI MASAHITO
Application Number:
JP2005068264A
Publication Date:
September 21, 2006
Filing Date:
March 10, 2005
Export Citation:
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Assignee:
MITSUI CHEMICALS POLYURETHANES
International Classes:
C07C263/10; C07C265/14
Domestic Patent References:
JP2004035492A2004-02-05
JP2004035489A2004-02-05
JP2001516333A2001-09-25
JP2003313155A2003-11-06
Foreign References:
WO2005005037A12005-01-20
WO2004014845A12004-02-19
WO2004037718A22004-05-06
Attorney, Agent or Firm:
Hiroyuki Okamoto



 
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