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Title:
METHOD FOR PRODUCING 2,4'-MDI
Document Type and Number:
Japanese Patent JP2006206593
Kind Code:
A
Abstract:

To provide 2,4'-MDI containing minute amounts of 2,2'-MDI.

The method comprises the following process: An isomeric starting mixture of diisocyanato-diphenylmethanes comprising 2,2'-diisocyanato-diphenylmethane, 2,4'-diisocyanato-diphenylmethane and 4,4-diisocyanato-diphenylmethane is distilled in a separating wall column in at least one step to produce at least one mixture comprising 85-99 mass% of 2,4'-diisocyanato-diphenylmethane, up to 15 mass% of 4,4'-diisocyanato-diphenylmethane and 0.2 mass% or less of 2,2'-diisocyanato-diphenylmethane.


Inventors:
SCHAAL HANS-PETER
WOLF ULRICH
Application Number:
JP2006020882A
Publication Date:
August 10, 2006
Filing Date:
January 30, 2006
Export Citation:
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Assignee:
BAYER MATERIALSCIENCE AG
International Classes:
C07C263/20; C07C265/14
Domestic Patent References:
JPS539750A1978-01-28
JP2004143173A2004-05-20
JP2004331667A2004-11-25
JP2004529115A2004-09-24
Foreign References:
WO2004056759A12004-07-08
Attorney, Agent or Firm:
Toshio Yano
Toshiomi Yamazaki
Takuya Kuno
Einzel Felix-Reinhard
Reinhard Einsel



 
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