Nanofiltration of concentrated aqueous salt solutions

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

1995-04-17

1996-12-24

Fortuna, Ana

Liquid purification or separation

Processes

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

210651, 210653, B01D 6100

Patent

active

055870830

ABSTRACT:
A nanofiltration process using a conventional nanofiltration membrane module 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 providing multivalent ions in high salt aqueous concentrations. The process is particularly useful in favourably lowering the concentration of silica and dichromate ions in chloral kali and chlorate brine containing solutions and favourably raising the sodium sulphate level relative to sodium chloride in chloraldhali liquor. The relatively high salt concentration, surprisingly, effects little or no monovalent, particularly, Cl.sup.- rejection.

REFERENCES:
patent: 4723603 (1988-02-01), Plummer
Raman et. al., "Consider Nanofiltration For Membrane Separations", Chemical Engineering Progress, Mar. 1994, pp. 68-74.
Raltenbach et. al., "Separation Potential of Nanofiltration Membranes", Desalination, 77 (1990) 73-84.

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