Method of size-selective extraction from solutions

Details Method of size-selective extraction from solutions Method of size-selective extraction from solutions

1983-08-25

1985-11-26

Fisher, Richard V.

Liquid purification or separation

Processes

Ion exchange or selective sorption

210689, B01D 1506, B01D 1508

Patent

active

045553440

ABSTRACT:
A separation method utilizing the ability of cross-linked ionic polymer gels to selectively extract solvent from a solution of a macromolecular material. A feed solution containing macromolecules is added to a small amount of basic or warm gel. The gel swells, absorbing the low molecular weight solvent, but cannot absorb the large macromolecules. The raffinate, which is now a concentrated macromolecular solution, is drawn off. To regenerate, a little acid is added to the filtered gel, or the gel is cooled, so its volume decreases sharply. The solvent is expelled from the shrinking gel and is then drawn off, leaving only the collapsed gel. A base is added to the gel, or the gel is warmed. More feed solution is added, and the cycle is begun again.

REFERENCES:
patent: 3386912 (1968-06-01), Lazare
patent: 3658745 (1972-04-01), Merrill et al.
patent: 3721621 (1973-03-01), Hough
patent: 3817379 (1974-06-01), Zipilivan et al.
patent: 3925017 (1975-12-01), Updike
patent: 3968093 (1976-07-01), Hasegawa et al.

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