Nanofiltration of concentrated aqueous salt solutions

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

B - Operations, Transporting

01

D

B01D 61/14 (2006.01) B01D 61/02 (2006.01)

Patent

CA 2163480

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 rejection.

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