Recovery of Potassium hydroxide (cas 1310-58-3) from strong potassium aluminate solutions using solvent extraction with alkyl phenols

Add time:08/17/2019    Source:sciencedirect.com

Solvent extraction of Potassium hydroxide (cas 1310-58-3) from strong potassium aluminate solutions was investigated systematically, where alkyl phenols with the stereo-hindrance of alkyl substituents to the hydroxyl functional group were used as extractants. The research focused on organic phase, phase equilibrium, multi-stage counter current extraction/stripping and extraction mechanism. The alkyl phenol, namely 2,4-di-tert-butylphenol, was found to be a promising extractant. When it was dissolved in 1-octanol diluent to form an organic phase, this organic phase would have a higher K/Al selectivity and a good stability for KOH extraction from the strong potassium aluminate solution. The extraction mechanism of KOH by alkyl phenol was analyzed and found to agree with the so-called pseudo-hydroxide extraction mechanism. The phase equilibrium curves in both KOH-H2O-organic phase system and KOH-KAlO2-H2O-organic phase system were measured at different temperatures with different extractant concentrations. Based on the measured phase equilibrium data, a multi-stage counter current extraction/stripping process was designed, and experiments by single-stage, two-stage and three-stage processes were carried out to evaluate the feasibility and efficiency of the KOH extraction from the strong alkaline potassium aluminate solutions. Through a three-stage extraction process at 40 °C, KOH concentration in potassium aluminate solution with 3.7 mol/L Al can be decreased from 528 g/L to 312 g/L, satisfying the Al(OH)3 seeded precipitation condition.

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