Patent ID: 9630861
Date: 2017-04-25
CPC Classifications: B01D,C01B,C02F,C07C,Y02A,Y02W

Claim:
1. A forward osmosis apparatus, comprising a feed solution; a draw solution comprising a cation source in an ionized state and an anion source in an ionized state; a diluting means for bringing the feed solution and the draw solution into contact through a semi-permeable membrane and diluting the draw solution with water separated from the feed solution by means of the semi-permeable membrane; a separating means for separating the draw solution that has been diluted by the diluting means into the cation source and anion source and into water; and a dissolving means, for returning the cation source and the anion source that have been separated by the separating means to, and for dissolving the separated cation source and the separated anion source in, the draw solution that has been diluted; wherein the molecular weight of the cation source in an uncharged state is 31 or greater and the Henry's law constant of each of the anion source and cation source is 1.0×10