US 12,251,662 B2
Forward osmosis membrane, forward osmosis membrane module, and manufacturing method thereof
Daisuke Hotta, Tokyo (JP)
Assigned to Asahi Kasei Kabushiki Kaisha, Tokyo (JP)
Appl. No. 17/614,682
Filed by Asahi Kasei Kabushiki Kaisha, Tokyo (JP)
PCT Filed May 29, 2020, PCT No. PCT/JP2020/021437
§ 371(c)(1), (2) Date Nov. 29, 2021,
PCT Pub. No. WO2020/241860, PCT Pub. Date Dec. 3, 2020.
Claims priority of application No. 2019-102652 (JP), filed on May 31, 2019.
Prior Publication US 2022/0226778 A1, Jul. 21, 2022
Int. Cl. B01D 61/00 (2006.01); B01D 63/04 (2006.01); B01D 67/00 (2006.01); B01D 69/02 (2006.01); B01D 69/08 (2006.01); B01D 69/12 (2006.01); B01D 71/56 (2006.01)
CPC B01D 61/002 (2013.01) [B01D 61/005 (2013.01); B01D 63/04 (2013.01); B01D 67/0006 (2013.01); B01D 67/0088 (2013.01); B01D 69/02 (2013.01); B01D 69/08 (2013.01); B01D 69/1251 (2022.08); B01D 71/56 (2013.01); B01D 2323/081 (2022.08); B01D 2325/20 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A forward osmosis membrane in which a separation active layer of a polymer is provided on a surface of a microporous support membrane, wherein
when purified water is arranged as a raw material liquid on the separation active layer side and 3.5% by mass of a sodium chloride aqueous solution is arranged as a draw solution on the microporous support membrane side via the forward osmosis membrane, a salt reverse diffusion amount R1 into the raw material liquid is 0.65 g/(m2×hr) or less, and a water permeability F1 into the draw solution is 3.5 kg/(m2×hr) or more.