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Title:
DISTILLATION PROCESS FOR SEPARATING DIISOCYANATODIPHENYLMETHANE ISOMERS
Document Type and Number:
Japanese Patent JP2004331667
Kind Code:
A
Abstract:

To distill a mixture of isomeric diisocyanatodiphenylmethanes composed of at least 2,2'-diisocyanatodiphenylmethane, 2,4'-diisocyanatodiphenylmethane and 4,4'-diisocyanatodiphenylmethane.

The mixture of isomeric diisocyanatodiphenylmethanes is distilled in at least one stage and a divided-wall column is used in at least one distillation stage.


Inventors:
SCHAL HANS-PETER
WOLF ULRICH
THELEN BERND
Application Number:
JP2004138421A
Publication Date:
November 25, 2004
Filing Date:
May 07, 2004
Export Citation:
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Assignee:
BAYER MATERIALSCIENCE AG
International Classes:
C07C265/14; C07C263/20; (IPC1-7): C07C263/20; C07C265/14
Domestic Patent References:
JPS5890540A1983-05-30
JPS5035142A1975-04-03
JPS539750A1978-01-28
JPH05163231A1993-06-29
JPH11314002A1999-11-16
JP2000140501A2000-05-23
JPH09299702A1997-11-25
Attorney, Agent or Firm:
Osamu Kawamiya
Samejima Mutsumi
Genban Sanae