Apparatus and method for spent alkali metal halide solution...

Details Apparatus and method for spent alkali metal halide solution... Apparatus and method for spent alkali metal halide solution...

B - Operations, Transporting

01

D

B01D 61/36 (2006.01) B01D 63/00 (2006.01)

Patent

CA 2469769

A method of enhancing the concentration of alkali metal halide in an aqueous solution comprising (a) feeding said alkali metal halide solution having an alkali metal halide first concentration at a first vapor pressure to an osmotic membrane distillation means having a hydrophobic gas and water vapor permeable membrane separating (i) a first chamber, for receiving said alkali metal halide solution, from (ii) a second chamber for receiving a receiver feed aqueous solution having a second vapor pressure lower than said first vapor pressure; (b) feeding said receiver aqueous feed solution to said second chamber as to effect transfer of water vapor through said membrane from said first chamber to said second chamber and produce a resultant alkali metal halide solution at a second concentration greater than said first concentration; and (c) collecting said resultant alkali metal halide solution. The process and associated apparatus, preferably, provide a convenient and inexpensive way of re- concentrating Spent Brine to Feed Brine. 17

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