Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1996-08-16
1998-05-12
Cintins, Ivars
Liquid purification or separation
Processes
Ion exchange or selective sorption
95 90, B01D 1500, B01D 5302
Patent
active
057500304
ABSTRACT:
It is proposed to use a synthetic granulate or powder with a particle size of 0.1 to 10 mm as packing material for the removal of liquid, gaseous and/or dissolved constituents from a process stream, which packing material is made up of a porous, preferably dimensionally stable polymer having an overall porosity of 50 to 95% by volume, which when used as an extracting medium has pores of a diameter of 0.01 to 50 .mu.m, with an extracting liquid immobilised therein, or when used as a coalescence medium has a cellular body/window structure with the diameter of more than 50% by volume of the bodies being in the range of 100 to 700 .mu.m, which materials can be obtained by dissolving a polymer in one or more liquid and miscible compounds at a temperature above the upper critical phase separation temperature Tc, followed by a lowering of the temperature and mechanical diminution of the polymer filled with the liquid compounds, optionally followed by removal of the liquid therefrom and, optionally, refilling of at least 10% of the pore volume with an extracting liquid, characterised in that the polymer solution incorporates 5 to 60% by volume of filler, calculated on the overall solids content. The granulate or powder preferably is subjected to an aftertreatment by being coated with a powder or fibrous material having a softening temperature or melting temperature higher than that of the material to be coated.
REFERENCES:
patent: 4239516 (1980-12-01), Klein
patent: 4247498 (1981-01-01), Castro
patent: 4659473 (1987-04-01), Klein
Patent Astracts of Japan, vol. 12, No. 56 (C-477) 1988.
Derwent Patent Abstract 87-288418 (1987).
Derwent Patent Abstract 73969 D/41 (1980).
Bos Johannes
Middelhoek Erik Leonard
Schomaker Elwin
Cintins Ivars
Fennelly Richard P.
Morris Louis A.
Nobelnv Akzo
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