Forward osmosis process

Patent metadata

Field	Value
Publication number	US-10087090-B2
Application number	US-201615085197-A
Country	US
Kind code	B2
Filing date	Mar 30, 2016
Priority date	Sep 29, 2010
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

A forward osmosis apparatus is improved. A forward osmosis apparatus, comprising a diluting means for bringing a feed solution and a draw solution comprising a cation source and an anion source in an ionized state 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, returning the cation source and the anion source that have been separated by the separating means to, and dissolving the cation source and 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 4 (Pa/mol·fraction) or greater in a standard state.

First claim

What is claimed is:

1. A forward osmosis process, comprising:
bringing a feed solution and a draw solution comprising a dissolved cation source and an anion source into contact through a semi-permeable membrane and diluting the draw solution with a water separated from the feed solution by the semi-permeable membrane;
separating the diluted draw solution into the cation source and anion source and into water; and
returning the separated cation source and anion source to, and dissolving the separated cation source and anion source in, the diluted draw solution;
wherein the cation source comprises an amine compound having a molecular weight of 31 or greater in an uncharged state, and each of the anion source and the cation source has a Henry's law constant of 1.0×10 4 (Pa/mol·fraction) or greater in water in a standard state.

2. A forward osmosis process, comprising:
bringing a feed solution and a draw solution comprising a dissolved cation source and an anion source into contact through a semi-permeable membrane and diluting the draw solution with a water separated from the feed solution by the semi-permeable membrane;
separating the diluted draw solution into the cation source and anion source and into water; and
returning the separated cation source and anion source to, and dissolving the separated cation source and anion source in, the diluted draw solution;
wherein the cation source comprises one or more members selected from the group consisting of trimethyl amine, dimethyl ethyl amine, isopropyl amine, dimethyl amine, and diethyl amine; the cation source has a molecular weight of 31 or greater in an uncharged state; and each of the anion source and the cation source has a Henry's law constant of 1.0×10 4 (Pa/mol·fraction) or greater in water in a standard state.

3. A forward osmosis process, comprising:
bringing a feed solution and a draw solution comprising a dissolved cation source and an anion source into contact through a semi-permeable membrane and diluting the draw solution with a water separated from the feed solution by the semi-permeable membrane;
separating the diluted draw solution into the cation source and anion source and into water; and
returning the separated cation source and anion source to, and dissolving the separated cation source and anion source in, the diluted draw solution;
wherein the cation source has a molecular weight of 31 or greater in an uncharged state, and each of the anion source and the cation source has a Henry's law constant of 1.0×10 4 (Pa/mol·fraction) or greater in water in a standard state;
and further wherein the cation source comprises trimethyl amine or dimethyl ethyl amine, and the anion source comprises carbon dioxide.

Assignees

• Fujifilm Corp

Inventors

• Ikeda Morihito
• Miyamoto Kimiaki

Classifications

• C02F1/16

  using waste heat from other processes · CPC title

• C07C211/00

  Compounds containing amino groups bound to a carbon skeleton · CPC title

• C01B32/60

  Preparation of carbonates or bicarbonates in general (of percarbonates C01B15/10; of specific carbonates or bicarbonates according to the cation C01B-C01G) · CPC title

• C02F1/02

  by heating (methods of steam generation F22B; preheating boiler feed-water or accumulating preheated boiler feed-water F22D) · CPC title

• Y02A20/131

  Reverse-osmosis · CPC title