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
WOLF ULRICH
THELEN BERND
Application Number:
JP2004138421A
Publication Date:
November 25, 2004
Filing Date:
May 07, 2004
Export Citation:
Assignee:
BAYER MATERIALSCIENCE AG
International Classes:
C07C265/14; C07C263/20; (IPC1-7): C07C263/20; C07C265/14
Domestic Patent References:
JPS5890540A | 1983-05-30 | |||
JPS5035142A | 1975-04-03 | |||
JPS539750A | 1978-01-28 | |||
JPH05163231A | 1993-06-29 | |||
JPH11314002A | 1999-11-16 | |||
JP2000140501A | 2000-05-23 | |||
JPH09299702A | 1997-11-25 |
Attorney, Agent or Firm:
Osamu Kawamiya
Samejima Mutsumi
Genban Sanae
Samejima Mutsumi
Genban Sanae