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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)
Application Number:
PCT/JP2006/322811
Publication Date:
June 07, 2007
Filing Date:
November 16, 2006
Export Citation:
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Assignee:
NIPPON POLYURETHANE KOGYO KK (JP)
KOBAYASHI TOSHIHIDE (JP)
YAMADA SUSUMU (JP)
YAMAGUCHI TATSUYA (JP)
YOSHIHARA TOMOMITSU (JP)
International Classes:
C08G12/08
Foreign References:
US3367969A1968-02-06
JPH03294249A1991-12-25
Attorney, Agent or Firm:
KOJIMA, Takashi (16-12 Ginza 2-chome, Chuo-k, Tokyo 61, JP)
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