METHOD FOR OBTAINING CALCIUM HYPOCHLORITE AT INTEGRATED PROCESSING OF NATURAL POLYCOMPONENT SUPERSATURATED BRINE OF CHLORIDE CALCIUM-MAGNESIUM TYPE Russian patent published in 2017 - IPC C01B11/06 C01F11/00 C25B1/46 C01F5/30 C01D15/00 

FIELD: chemistry.

SUBSTANCE: method for obtaining calcium hypochlorite from supersaturated natural multicomponent brine of chloride calcium-magnesium type includes the selection hydrated calcium chloride from brine and separation of mother brine enriched in lithium and bromine. A membrane or diaphragm electrolysis of an aqueous solution of sodium chloride is carried out for the production of chlorine and catholyte. A solution of sodium hypochlorite is obtained by ejecting anodic chlorine with a catholyte stream - NaOH solution. Calcium hypochlorite is obtained by an exchange reaction between calcium hydroxide and sodium hypochlorite. The resulting calcium hypochlorite is separated from the mother liquor and dried. The mother liquor is recycled with NaCl return to production. First, the natural supersaturated polycomponent brine is cooled to 0…-1°C, obtaining a solid phase of crystal hydrate CaCl₂⋅6H₂O with an admixture of crystal hydrate MgCl₂⋅6H₂O and a liquid phase. Crystalline hydrates are separated from the liquid phase, heated in the presence of NaOH and stirred, separating CaCl₂⋅6H₂O from the solid phase of MgCl₂⋅6H₂O and the formed solid phase of Mg(OH)₂. CaCl₂⋅6H₂O purified from magnesium is brought into contact with the catholyte. The resulting pulp is centrifuged to produce a cake in the form of Ca(OH)₂ and a fugate in the form of a solution NaCl, which after purification from calcium is returned to a membrane electrolysis operation to produce catholyte and chlorine.

EFFECT: invention slows to implement the method for obtaining calcium hypochlorite in a continuous mode, to reduce the energy intensity of the process, to reduce the cost of the heating steam, to increase output of calcium hypochlorite.

3 cl, 3 dwg, 5 ex