Title:
メチレンジフェニルジイソシアネートの製造方法
Document Type and Number:
Japanese Patent JP5519942
Kind Code:
B2
Abstract:
Producing methylene diphenyl diisocyanates, comprises: (a) reacting aniline with formaldehyde in the presence of hydrochloric acid as catalyst to a mixture of di- and polyamines of diphenylmethane and subsequently at least partially neutralizing the hydrochloric acid by alkali hydroxide, preferably sodium hydroxide; and (b) reacting the mixture of di- and polyamines of the diphenylmethane with phosgene to a mixture of di- and polyisocyanates of the diphenylmethane and hydrogen chloride. Producing methylene diphenyl diisocyanates, comprises: (a) reacting aniline with formaldehyde in the presence of hydrochloric acid as catalyst to a mixture of di- and polyamines of diphenylmethane and subsequently at least partially neutralizing the hydrochloric acid by alkali hydroxide, preferably sodium hydroxide; and (b) reacting the mixture of di- and polyamines of the diphenylmethane with phosgene to a mixture of di- and polyisocyanates of the diphenylmethane and hydrogen chloride, where: (c) the neutralized hydrochloric acid is separated in the form of alkali chloride-containing solution and is subsequently carried out at least partial electrochemical oxidation under the formation of chlorine, alkaline solution and optionally hydrogen; and (d) at least a part of the produced chlorine is useful for producing phosgene.
Inventors:
Fritz Paul
Andreas Blanc
Liner Weber
Richard Adamson
Matthias Boehm
Christian Zix
Andreas Blanc
Liner Weber
Richard Adamson
Matthias Boehm
Christian Zix
Application Number:
JP2009047606A
Publication Date:
June 11, 2014
Filing Date:
March 02, 2009
Export Citation:
Assignee:
Bayer MaterialScience AG
International Classes:
C07C263/10; C07C209/78; C07C211/50; C07C265/14; C25B1/16; C25B1/26; C25B15/08; C07B61/00
Domestic Patent References:
| JP2007023034A | ||||
| JP2003313155A | ||||
| JP2002502838A | ||||
| JP2007197449A | ||||
| JP2006348030A | ||||
| JP2007326854A | ||||
| JP2006503007A | ||||
| JP2001516333A | ||||
| JP2006016267A | ||||
| JP2006057072A | ||||
| JP2004026753A | ||||
| JP2003502154A | ||||
| JP11124698A | ||||
| JP2010537799A |
Foreign References:
| CN101020642A |
Attorney, Agent or Firm:
Mitsuo Tanaka
Takuji Yamada
Kenichi Morizumi
Yasuo Shibata
Yasushi Ochiai
Takuji Yamada
Kenichi Morizumi
Yasuo Shibata
Yasushi Ochiai