METHOD OF PRODUCTION OF HIGHLY DEMINERALIZED WATER Russian patent published in 2006 - IPC C02F9/08 B01D61/36 C02F1/44 C02F1/52 C02F1/76 C02F103/04 

FIELD: treatment of water by reverse osmosis method; chemical power engineering and other industries; production of water for power-generating boilers and steam generation systems in ammonia processes.

SUBSTANCE: proposed method is based on use of industrial waste water, biologically cleaned waste water, shaft drainage water, catch basin water, regeneration and other effluents at total content of salt of 4-6 g/l and total hardness of up to 30 mg-eqv./l; then, de-mineralization is performed by reverse osmosis separation of water; concentrate thus obtained is subjected to secondary de-mineralization at additional reverse osmosis stage. Separation at membranes is carried out at filtration spectrum of from 0.0001 to 0.001 mcm at pressure of 22.5 Mpa, thus obtaining permeant and concentrate; permeant is directed de-carbonization and final de-mineralization in combined-action filters to total salt content of 0.2 mg/l. Proposed method increases productivity by permeant and reduces effluents. Provision is made for closed water consuming system. Quality of water satisfies requirements to feed water used in high- and medium-pressure steam generation systems in ammonia production process.

EFFECT: enhanced efficiency.

2 dwg, 5 tbl, 2 ex