ION-PAIR EXTRACTION OF MULTI-OH COMPOUNDS BY COMPLICATION WITH ORGANOBORONATE

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Abstract
Ion-pair extraction with organoboronate has been investigated as a regenerable means of removal and recovery of multi -OH compounds from aqueous solution. The extractant utilized was 3-nltrophenylboronate (NPB−), paired with Aliquat 336 as cation (A336+). The solubility of 3-nitrophenylboronic acid (NPBA) in water at 25°C was measured as 0.45 ± 0.02 g/100 g H2O. The 1:1 complexation stability constant for 1,2-propanediol with NPB− was measured by the buffer-capacity method through the Antikainen model as 3.2, 2.3 and 1.95 mol/1−1 at 25°, 35° and 44.8°C, respectively. The A336+NPB− ion pair was prepared by repeated washing of a mixture of Aliquat 336, NPBA and diluent with aqueous NaOH and then water. Equilibria were measured for extraction of fructose, glycerol, and sorbitol from aqueous solution Into the ion-pair extractant in a diluent of 2-ethylhexanol.