Title:
ジフェニルメタン系のジアミン及びポリアミンの製造方法
Document Type and Number:
Japanese Patent JP5140282
Kind Code:
B2
Abstract:
Preparation of di- and polyamine of the diphenylmethane series comprises transferring aniline and formaldehyde to a reaction mixture containing di- and polyamine, in the presence of an acid catalyst, neutralizing the reaction mixture containing di- and polyamine, introducing the neutralized reaction mixture containing di- and polyamine into an organic phase containing di- and polyamine and an aqueous phase, distillatively separating water and aniline form the organic phase, and cooling the obtained di- and polyamine. Preparation of di- and polyamine of the diphenylmethane series comprises: (a) transferring aniline and formaldehyde to a reaction mixture containing di- and polyamine, in the presence of an acid catalyst, (b) neutralizing the reaction mixture containing di- and polyamine, (c) introducing the neutralized reaction mixture containing di- and polyamine into an organic phase containing di- and polyamine and an aqueous phase, (d) distillatively separating water and aniline form the organic phase, where the distillation in step (d) comprises at least a pre-evaporation step and at least a distillation step; in the pre-evaporation step aniline and water are partially separated from the organic phase containing di- and polyamine by open evaporation; the further aniline and water are removed in the subsequent distillation step and the obtained di- and polyamine contains less than 1000 ppm of water and less than 200 ppm of aniline, based on the weight of di- and polyamine, and (e) cooling the obtained di- and polyamine. An independent claim is included for the preparation of di- and polyisocyanate of the diphenylmethane series comprising preparing di- and polyamine and subsequently reacting the amine with a phosgene.
Inventors:
Berthholt kegenhof
Richard Adamson
Rudolph Udorfdorf
Fritz Paul
Richard Adamson
Rudolph Udorfdorf
Fritz Paul
Application Number:
JP2007018269A
Publication Date:
February 06, 2013
Filing Date:
January 29, 2007
Export Citation:
Assignee:
Bayer MaterialScience AG
International Classes:
C07C209/78; C07C211/50; C07C263/10; C07C265/14; C07B61/00
Domestic Patent References:
JP63227609A | ||||
JP2004123746A | ||||
JP2004059920A | ||||
JP2002502838A | ||||
JP3294249A | ||||
JP60202844A | ||||
JP51070295A | ||||
JP2006348030A |
Attorney, Agent or Firm:
Toshio Yano
Takuya Kuno
Einzel Felix-Reinhard
Takuya Kuno
Einzel Felix-Reinhard