Method for making separations from aqueous solutions

Details Method for making separations from aqueous solutions Method for making separations from aqueous solutions

1974-10-24

1981-04-14

Spear, Jr., Frank A.

Liquid purification or separation

Processes

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

203 11, 210511, B01D 1104

Patent

active

042618185

ABSTRACT:
Method and apparatus for making separations from aqueous solutions, particularly for removing water from aqueous solutions of electrolytes or other substantially non-volatile solutes, such as saline water. According to the invention, a solvent extraction process is employed which produces streams of lower and higher solute concentration in composition from an aqueous solution by contacting the aqueous solution with a solvent to produce an extract stream and a residual raffinate stream, the solvent having the property of dissolving water at a first lower temperature and substantially releasing it at a second higher temperature without substantially extracting the solute from the aqueous solution. The extract stream is contacted with a hotter aqueous reflux and thereby simultaneously heated and caused to have its content of undesired solute diminished. In addition to the heat supplied by the reflux, heat is also added to the extract stream in a plurality of stages by condensing in the extract in each stage vapors obtained by flashing previously heated streams comprising mixtures of water and the solvent.

REFERENCES:
patent: 3088909 (1963-05-01), Davison et al.
patent: 3329583 (1967-07-01), Othmer

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