METHOD OF PURIFYING POTASSIUM HYDROXIDE SOLUTION Russian patent published in 2012 - IPC C01D1/32 

FIELD: chemistry.

SUBSTANCE: invention can be used in chemical industry. The method of purifying potassium hydroxide solution from metal impurities involves treatment of the initial product with basic magnesium carbonate. Purification is performed over potassium hydroxide solution obtained by dissolving solid potassium hydroxide in distilled water immediately before the purification step. The potassium hydroxide solution is purified using magnesium carbonate containing 0.1-0.5 wt % lanthanide salts, which is added, while stirring, to the purified solution in weight ratio to potassium hydroxide equal to (0.001-0.01):1. The reaction mass then undergoes microfiltration.

EFFECT: invention increases purity of the obtained product.

5 cl, 3 ex