Title:
MDI特に2,4’-MDIの調製
Document Type and Number:
Japanese Patent JP4114718
Kind Code:
B2
Abstract:
MDI is prepared by a process comprising the following steps: A) reaction of aniline and formaldehyde in the presence of an acid to give methylene(diphenyldiamines) and polymethylenepolyphenylenepolyamines, the molar ratio of acid to amine being not more than 0.2, B) reaction of the mixture obtained in step A) with phosgene to give methylene(diphenyl diisocyanates) and polymethylenepolyphenylene polyisocyanates, C) separation of the mixture obtained in step B) into monomeric MDI and polymeric MDI and D) separation of the monomeric MDI obtained in step C) by isolating 2,4'-MDI.
Inventors:
Life, martin
Bruchmann, Bernd
Paul, Sigmund
Bettendorf, Karl
Plaumann, Heinz
Thiele, Chi
Bruchmann, Bernd
Paul, Sigmund
Bettendorf, Karl
Plaumann, Heinz
Thiele, Chi
Application Number:
JP2002570616A
Publication Date:
July 09, 2008
Filing Date:
March 06, 2002
Export Citation:
Assignee:
BASF SE
International Classes:
C07C263/10; C07B61/00; C07C263/20; C07C265/14; C08G18/76
Domestic Patent References:
| JP53009750A | ||||
| JP51038713B1 |
Attorney, Agent or Firm:
Satoshi Eto