FIELD: chemical technology; inorganic chemistry. SUBSTANCE: method involves interaction of potassium chloride with sodium sulfate and with mother solution of potassium sulfate and separation thus prepared glasurite. Then interaction of potassium chloride with water is carried out to prepare potassium sulfate and mother solution of potassium sulfate. Mother solution of glasurite is cooled, Glauber's salt is crystallized, separated and is then recycled into stage of crystallization of glasurite. According to invention evaporation of water is carried out with the help of solar energy, solar evaporator being used. Thus pure sodium chloride is crystallized and is uninterruptedly or periodically discharged of solar evaporator. EFFECT: improved efficiency. 4 cl, 1 dwg
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