Forward osmosis membrane and forward osmosis membrane module containing the same

A substrate-free forward osmosis membrane with polysulfone or polyethersulfone support and polyamide layer addresses durability and performance issues, enabling efficient, non-heated concentration of substances in the presence of organic solvents.

JP2026113649APending Publication Date: 2026-07-07ASAHI KASEI KOGYO KABUSHIKI KAISHA
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
ASAHI KASEI KOGYO KABUSHIKI KAISHA
Filing Date
2026-04-06
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Existing forward osmosis membranes lack durability when exposed to organic solvents, have insufficient water permeability, and high salt backdiffusion, and are difficult to produce cost-effectively.

Method used

A forward osmosis membrane composed of a porous support and a separation functional layer, without a substrate, using polysulfone or polyethersulfone as the porous support and a polyamide separation functional layer with an uneven structure, ensuring high water permeability and low salt backdiffusion, and designed to withstand organic solvents.

Benefits of technology

The membrane achieves high water permeability and low salt backdiffusion, maintaining performance even when exposed to organic solvents, facilitating non-heated concentration of substances like liquid foods and pharmaceuticals, while suppressing solute flow and contamination.

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Abstract

To provide a forward osmosis membrane that has a certain durability even when it comes into contact with an organic solvent that causes the forward osmosis membrane to swell, can exhibit high water permeability and blocking properties, and is easy to fabricate, and a forward osmosis membrane module using the same. 【Solution means】A forward osmosis membrane having a support membrane and a separation functional layer on the support membrane, wherein the support membrane has a porous support, water is disposed on the separation functional layer side with the forward osmosis membrane interposed therebetween, and a 3.5 mass% sodium chloride aqueous solution is disposed on the porous support side. After performing forward osmosis treatment at a transmembrane differential pressure P = 100 (kPa) with the porous support side being positive, when performing forward osmosis treatment at a transmembrane differential pressure P = 20 kPa with the porous support side being positive, the water permeation amount (F 100 , unit: kg / (m 2 ×hr)) and the reverse salt diffusion amount (R 100 , unit: g / (m 2 ×hr)) ratio (R 100 / F 100 ) satisfies the mathematical formula: 0 g / kg ≦ R 100 / F 100 ≦ 0.12 g / kg, a forward osmosis membrane.
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