The solubility in the water – alkylbenzenesulfonic acid – 1,2,3-benzotriazole system at 75°C was studied. The region of two-phase liquid equilibrium existing in wide intervals of component contents was found on the constructed phase diagram. The effect of inorganic salting agents and ammonia on the phase state of the system under selected optimal conditions was studied. The possibility of copper (II) ions extraction from highly mineralized solutions was investigated.
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