Title:
PROCESS FOR CONTINUOUS PRODUCTION OF POLYMETHYLENE POLYPHENYL POLYAMINE
Document Type and Number:
WIPO Patent Application WO/2007/063711
Kind Code:
A1
Abstract:
Disclosed is a process for continuous production of a polymethylene polyphenyl polyamine which can produce a polymethylene polyphenyl polyamine continuously by reacting aniline and formaldehyde in the presence of a hydrochloric acid catalyst. The process comprises: (A) a first condensation step in which aniline in an amount of 80-95% by mass relative to the total amount to be charged and a portion of the total amount of formaldehyde to be charged are reacted with each other in the presence of a hydrochloric acid catalyst under such conditions where the hydrogen chloride/aniline ratio (by mole) is 0.99 or less; (B) a second condensation step in which the reaction solution yielded in the first condensation step is mixed with the remainder of formaldehyde to react them with each other; and (C) an isomerization step in which the reaction solution yielded in the second condensation step is mixed with aniline in an amount of 5-20% by mass relative to the total amount to be charged to cause an isomerization reaction between them. According to the process, it becomes possible to produce a polymethylene polyphenyl polyamine which has a reduced N-methyl substance content to the similar level to that in a batch-wise process and contains methylene diphenyl diamine in an amount similar to that in a batch-wide process.
Inventors:
KOBAYASHI TOSHIHIDE (JP)
YAMADA SUSUMU (JP)
YAMAGUCHI TATSUYA (JP)
YOSHIHARA TOMOMITSU (JP)
YAMADA SUSUMU (JP)
YAMAGUCHI TATSUYA (JP)
YOSHIHARA TOMOMITSU (JP)
Application Number:
PCT/JP2006/322811
Publication Date:
June 07, 2007
Filing Date:
November 16, 2006
Export Citation:
Assignee:
NIPPON POLYURETHANE KOGYO KK (JP)
KOBAYASHI TOSHIHIDE (JP)
YAMADA SUSUMU (JP)
YAMAGUCHI TATSUYA (JP)
YOSHIHARA TOMOMITSU (JP)
KOBAYASHI TOSHIHIDE (JP)
YAMADA SUSUMU (JP)
YAMAGUCHI TATSUYA (JP)
YOSHIHARA TOMOMITSU (JP)
International Classes:
C08G12/08
Foreign References:
US3367969A | 1968-02-06 | |||
JPH03294249A | 1991-12-25 |
Attorney, Agent or Firm:
KOJIMA, Takashi (16-12 Ginza 2-chome, Chuo-k, Tokyo 61, JP)
Download PDF: