METHOD FOR REMOVING COPPER FROM WASTEWATER OF ACRYLIC ACID PRODUCTION Russian patent published in 2018 - IPC C02F1/62 C02F1/58 C22B15/00 C01G3/12 C02F101/20 

FIELD: processing and recycling of waste.

SUBSTANCE: invention can be used in the petrochemical industry to treat wastewater produced by acrylic acid containing copper. Method includes treatment of wastewater with sulphurous alkaline effluent with addition of coagulant and subsequent separation of the precipitate formed. Pre-sulfur-alkaline runoff is mixed with sodium sulfide to maintain the necessary concentration of sulfide ions, ratio of the number of moles of sulphide ions to the number of moles of copper is not less than 15 and the ratio of the weight of the effluent to the mass of the mixed sulphureous-alkaline runoff is not less than 3.75:1. In a preferred embodiment, a coagulant and a flocculant in a total amount of at least 0.5 mg/dm³ are added to the sulphurous alkaline runoff.

EFFECT: application of this method provides purification of effluents with different content of copper ions, a decrease in the consumption of reagents, a decrease in the volume of the deposition tanks and increasing the productivity of the process by increasing the deposition efficiency of copper sulfide.

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