Method of concentrating aqueous solutions

B - Operations – Transporting – 01 – D

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B01D 11/04 (2006.01) C02F 1/26 (2006.01)

Patent

CA 1190725

"METHOD OF CONCENTRATING AQUEOUS SOLUTIONS" ABSTRACT OF DISCLOSURE Method of concentrating aqueous solutions of non- volatile, ionic solutes by extracting water from the solution by means of a polar organic liquid (or a solution of a polar organic liquid and a non-polar organic liquid) at an elevated temperature and cooling the organic liquid to separate a water phase, the extractant and the temperature being chosen such that water has a relatively high solubility in the extractant at the higher temperature and a relatively low solubility at the lower temperature; the extractant being also chosen to meet certain other criteria such as inertness toward the solution and equipment. Advantage is taken of the diminished activity coefficient of water in polar organic liquids at elevated temperatures and in the case of certain solutions, advantage is also taken of the increased activity coefficient of water in aqueous ionic solution at elevated temperatures. -1-

384110

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