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Separation of the System NaCl-NaBr-Nal by “Solventing Out” from Aqueous Solution

Abstract The precipitation of NaX (X = Cl, Br, I) from their saturated aqueous solution by three miscible organic solvents (MOS)-acetone, acetonitrile and isopropylamine-was studied for various MOS-aqueous solution volumes ratios. It was found that the fraction precipitated f is given by f = K log V/Vc where V is the volume ratio and K and V c are constants. For the case of NaCl this plot was found to be a broken line composed of two straight lines intersecting at the point of “salting out.” A scheme is suggested to separate the three electrolytes using isopropylamine to precipitate NaCl and acetone to precipitate NaBr.