DEVICE AND METHOD FOR DESALINATION OF WATER Russian patent published in 2017 - IPC C02F9/10 C02F1/44 C02F1/22 

FIELD: chemistry.

SUBSTANCE: method includes the steps of passing the brine stream 2' In the first desalting stage through a reverse osmosis membrane desalination plant 3', comprising at least one reverse-osmosis desalination unit 4' to form a stream 5' of the first aqueous product having a reduced salt concentration relative to the concentration of the brine feed stream 2', and stream 6' of the first by-product having an increased salt concentration relative to the concentration of the brine feed stream 2'. Feed 6' of the first by-product is passed to a second desalting step through the suspension crystallization unit 7 to form a stream 8 of a second aqueous product having a reduced salt concentration relative to the concentration of stream 6' of the first by-product, and the second by-product stream 9 having an increased salt concentration relative to the concentration of the stream 6' of the first by-product. The desalination device further includes a static crystallization unit (10) or a second slurry crystallization unit having an inlet (92) in fluid communication with the outlet (91) of the suspension crystallization unit (7) and an outlet (121) for the stream (12) of the third water product, and release (131) for the third by-product stream (13).

EFFECT: reduction of the volume of the first by-product stream with increased salt concentration.

12 cl, 9 dwg, 4 tbl, 4 ex