FIELD: chemistry.
SUBSTANCE: invention can be used in petrochemical industry and in production of a coolant or a polymerisation modifier when producing rubber. The method of producing industrial brine involves mixing sodium chloride sources and cleaning the obtained brine from calcium ions. Saline waste water with weight ratio of sodium chloride of 1.3-1.6% and still waste liquid from soda production are mixed in weight ratio (0.1-1.0): 1.0. The obtained brine is then cleaned from calcium ions by treatment with sodium hydroxide or 46% sodium hydroxide solution.
EFFECT: invention enables to obtain purified brine with content of sodium chloride of 84-157 g/dm3 and calcium ions of less than 30 g/dm3, while reducing operational and capital costs and recycling contaminated waste water and still waste liquid.
3 ex
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