Patent ID: 9676639
Date: 2017-06-13
CPC Classifications: B01D,C02F,Y02A,Y02W

Claim:
1. A system for purifying water, the system comprising: a feed solution source; a draw solution source; a semipermeable membrane comprising a feed side for receiving, from the feed solution source, a feed solution stream having a first osmotic pressure and a draw side for receiving, from the draw solution source, a liquid draw solution stream comprising a liquid draw solute and having a second osmotic pressure, wherein a diluted draw solution stream is produced when water passes from the feed solution stream to the draw side via the semipermeable membrane; a first heat exchanger to heat the diluted draw solution stream; a coalescer configured to agglomerate the draw solute in the diluted draw solution stream to produce an agglomerated two phase effluent stream comprising a liquid phase of agglomerated draw solute and a liquid phase of water; a liquid phase separator capable of separating two or more immiscible liquids or solutions, the liquid phase separator configured to separate the agglomerated draw solute from the agglomerated two phase effluent stream to produce a water rich stream comprising water and residual draw solute, and a solute rich stream comprising the agglomerated draw solute and water; a second heat exchanger for cooling the water rich stream to produce a cooled single phase water rich stream; and a filtration module for separating the residual draw solute from the cooled single phase water rich stream to produce a residual draw solute stream and a purified water product stream.