Nanofiltration of concentrated aqueous salt solutions

Details Nanofiltration of concentrated aqueous salt solutions Nanofiltration of concentrated aqueous salt solutions

1996-09-25

1999-01-12

Fortuna, Ana

Liquid purification or separation

Processes

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

210651, 210641, 210805, 210653, 210639, B01D 6100

Patent

active

058582401

ABSTRACT:
Nanofiltration processes using one or more conventional nanofiltration membrane modules under a positive applied pressure is used to selectively change the concentration of one solute, such as sodium chloride or sodium chlorate providing monovalent ions, from another solute such as sodium sulfate or sodium dichromate to provide multivalent ions in high salt aqueous concentrations. The process is particularly useful in favourably lowering the concentration of undesirable ions, particularly, of silica and dichromate ions in chloralkali and chlorate brine containing solutions and favourably raising the sodium sulphate level relative to sodium chloride in chloralkali liquor.

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