DEVICE FOR CONTINUOUS WATER DEMINERALISATION IN CLOSED CIRCUIT AT ALTERNATE PRESSURE IN ONE TANK Russian patent published in 2009 - IPC C02F1/44 B01D61/02 

FIELD: treatment facilities.

SUBSTANCE: invention is intended for sea water conversion and hard water demineralisation. Device of continuous gradual demineralisation of aqueous salt solution by reverse osmosis includes close-cycle circuit with one or more parallel connected demineralisation modules, counter-pressure generator, circulation unit maintaining demineralised solurion recirculation in the closed circuit, and tank for replacement of concentrated salt solution by new feed liquor. Additionally the device features control units and valve mechanism maintaining tank disconnection and connection to the closed circuit, replacement of concentrated salt solution by new feed liquor from tank, and pressure building and tank decompression. Each demineralisation module includes one or more membrane elements. Also invention claims method of aqueous salt solution demineralisation by the claimed aggregate.

EFFECT: reduced energy costs, maintenance of continuous demineralisation process by a simple aggregate.

20 cl, 1 dwg, 1 tbl, 2 ex