Liquid purification or separation – Processes – Ion exchange or selective sorption
Reexamination Certificate
2004-04-29
2008-10-21
Barry, Chester T (Department: 1797)
Liquid purification or separation
Processes
Ion exchange or selective sorption
C558S146000
Reexamination Certificate
active
07438818
ABSTRACT:
The invention relates to a process for immobilizing acidic or electrophilic compounds in a solution. The process is characterized in that it consists in bringing a crosslinked polyimine, which is insoluble in the medium and in which the imino groups are —NH-groups, into contact with said compounds and in then separating, by filtration, the modified polyimine obtained. The crosslinked polyimine comprises linear segments composed of —HN—R1—NH—R2—Ar—R3-units in which R1, R2and R3are identical or different alkylene or alkenylene groups and Ar represents an aromatic group. The process is of use for fixing undesirable compounds or for purifying acidic compounds.
REFERENCES:
patent: 5162404 (1992-11-01), Rainer
patent: 2004/0232081 (2004-11-01), Boese et al.
patent: 101 43 171 (2003-03-01), None
Yoshida Hiroyuki et al. “Adsorption of Strong Acid on Polyaminated Highly Porous Chitosan: Equilibria”, Ind. Eng. Chem. Res. 1994, vol. 33, pp. 854-959, XP002266337.
Database WPI, Section Ch, Week 198744, Derwent Publications Ltd., London, GB; Class A26, AN 1987-309423, XP002266338 and JP 62 216641 A (Nippon Shokubai Kagaku Kogyo Co Ltd), (Sep. 24, 1987).
PCT Search Report dated Sep. 15, 2004.
Barry Chester T
Centre National de la Recherche Scientifique
Crowell & Moring LLP
Universite de Montpellier I
Universite de Montpellier II
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