Temperature-sensitive method of size-selective extraction from s

Details Temperature-sensitive method of size-selective extraction from s Temperature-sensitive method of size-selective extraction from s

1987-12-08

1989-05-09

Jones, W. Gary

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210670, 210689, 210774, B01D 1500

Patent

active

048287016

ABSTRACT:
A separation method utilizing the ability of temperature-sensitive cross-linked 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 gel. The gel swells to absorb the low molecular weight solvent, but it cannot absorb the macromolecules. The raffinate, which is now a concentrated macromolecular solution, is drawn off. To regenerate, the filtered gel is warmed, so that its volume decreases sharply. This suddenly decreased volume occurs because the gel is near a critical point. The solvent is removed from the shrunken gel. The temperature of the gel is then lowered; 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.
patent: 4555344 (1985-11-01), Cussler
N. A. Peppas and E. W. Merrill, J. Biomed. Mater. Res., 11, 423 (1977).
E. W. Merrill et al., J. Appl. Physiol., 29, 723 (1970).

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