METHOD OF PRODUCING HIGHLY PURE CALCIUM CHLORIDE SOLUTION Russian patent published in 2016 - IPC C01F11/28 C01F11/32 B01D21/01 B01D37/03 

FIELD: chemistry.

SUBSTANCE: invention can be used in chemical, wood, wood processing, oil industry, in refrigeration equipment, in construction, in production of deicing agents. Method of producing highly pure calcium chloride solution involves reaction of calcium-containing raw material with hydrochloric acid, settling, clarification of neutralised calcium chloride solution in presence of a flocculant, separation of clarified calcium chloride solution. Clarification of calcium chloride solution is carried out in a thickener. Flocculant is selected from polyacrylamide group. Thickened portion of solution from thickener is fed for filtering on a press filter using a solution of flocculant, selected from polyacrylamide group to obtain highly pure calcium chloride solution. Dosage flocculant 0.0004-0.001% of weight of thickened slurry of calcium chloride. Waste gases from production containing admixture of hydrogen chloride are fed into an antifoaming agent and then for post-treatment in Venturi scrubbers irrigated with calcium chloride solution.

EFFECT: invention enables to reduce amount of wastes, improves product yield and efficiency of process.

1 cl, 1 dwg, 1 tbl, 1 ex