Process and apparatus for removing solutes from solutions

Details Process and apparatus for removing solutes from solutions Process and apparatus for removing solutes from solutions

1992-11-23

1995-04-04

Dawson, Robert A.

Liquid purification or separation

Processes

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

210663, 210651, 210737, 210738, 210688, 2101952, 2102572, 210790, 210749, B01D 6100

Patent

active

054034906

ABSTRACT:
An improved process and system for treating a solution of a solute which can be concentrated by forcing a portion of the solvent through a semi-permeable membrane and converted to the solid phase by increasing the concentration of the solute in the solution. A phase conversion device receives the solution and converts a portion of the solute to the solid phase. The resulting mixture is passed through a separation device such as a filter to remove the solids from the remaining solution. A concentration device such as a reverse osmosis, electrodialysis or ultrafiltration device treats the resultant solution discharging a permeate of solvent essentially free of solute and a concentrate enriched in solute. A recycle line recycles the concentrate to the phase conversion device to advance precipitation of the solute by driving the solubility equilibrium toward precipitation.

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patent: 5192418 (1993-03-01), Hughes et al.
patent: 5200082 (1993-04-01), Olsen et al.
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