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Title:
FRACTIONATION AND PURIFICATION OF AROMATIC POLYAMINE MIXTURE AND ITS USE
Document Type and Number:
Japanese Patent JPH08283212
Kind Code:
A
Abstract:

To readily fractionate and purify the subject mixture and produce isomers in the pure form and in the enriched form with a good separation efficiency by recycling and extracting the aromatic polyamine mixture in the multi-stage extraction in a two-phase system comprising a specific solvent phase and an aqueous phase according to the countercurrent principle and then distilling the organic phase in the multi-stage distillation.

An aromatic polyamine mixture is mixed with a two-phase system comprising a hydrophobic solvent phase consisting of (A1) a hydrophobic solvent and, as necessary, (A2) an aromatic auxiliary amine and (A3) a polyamine and an aqueous phase consisting of water, a strong acid, the component A2 and, as necessary, the component A3 to carry out a first extraction according to the countercurrent principle and provide a first aqueous phase and a first organic phase. The resultant first organic phase is then distilled in a first multi-stage distillation to afford respective fractions consisting essentially of the components A1 to A3. The first aqueous phase is extracted with a solvent phase consisting of the components A1 and A2 in a second extraction to provide a second aqueous phase and a second organic phase. The second organic phase is subsequently distilled in the multi-stage distillation in the same manner as that in the first multi-stage distillaton. The second aqueous phase is extracted with an organic phase consisting of the component A1 and, as necessary, the component A2 in a third expraction to afford a third aqueous phase and a third organic phase, which are respectively recycled to the first aqueous phase and the solvent phase in the second extraction and then fractionated and purified.


Inventors:
HARUTOMUUTO KUNEFUERU
MIHIYAERU BUROTSUKERUTO
Application Number:
JP10477596A
Publication Date:
October 29, 1996
Filing Date:
April 03, 1996
Export Citation:
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Assignee:
BAYER AG
International Classes:
C07C209/72; C07C209/84; C07C209/86; C07C211/34; C07C211/50; C07C263/10; C07C265/14; C08G12/08; C08G18/76; C08G59/50; C08K5/18; (IPC1-7): C07C211/50; C07C209/72; C07C209/84; C07C209/86; C07C211/34; C07C263/10; C07C265/14; C08G12/08; C08G18/76; C08G59/50; C08K5/18
Attorney, Agent or Firm:
Kazuho Kawarada (1 person outside)