Effect of molecular weight of draw solute on water permeation in forward osmosis process

Masahiro Yasukawa; Yasuhiro Tanaka; Tomoki Takahashi; Masafumi Shibuya; Shoji Mishima; Hideto Matsuyama

doi:10.1021/acs.iecr.5b01960

Effect of molecular weight of draw solute on water permeation in forward osmosis process

Masahiro Yasukawa, Yasuhiro Tanaka, Tomoki Takahashi, Masafumi Shibuya, Shoji Mishima, Hideto Matsuyama

Kobe University

Research output: Contribution to journal › Article › peer-review

44 Citations (Scopus)

Abstract

To realize the application of forward osmosis (FO) membranes to industrial-level water treatment, the correct selection of the draw solute (DS) and good membrane performance is necessary. In this study, the FO flux behavior was investigated using draw solutes of inorganic salt (NaCl) and neutral polymers (PEGs) with molecular weights of 200-8300. The FO flux dramatically decreased with increasing molecular weight of the DS. Severe internal concentration polarization originated from the lower diffusivity of the larger DS molecules, which brought about the flux reduction. The experimental data were analyzed with a model developed using a virial expansion equation for osmotic pressure in the case of the polymeric draw solutions. The analyzed results fit well with the experimental data, which allowed us to predict a relation between FO performance and the molecular weights of the draw solutes for different FO membranes.

Original language	English
Pages (from-to)	8239-8246
Number of pages	8
Journal	Industrial and Engineering Chemistry Research
Volume	54
Issue number	33
DOIs	https://doi.org/10.1021/acs.iecr.5b01960
Publication status	Published - 26 Aug 2015
Externally published	Yes

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title = "Effect of molecular weight of draw solute on water permeation in forward osmosis process",

abstract = "To realize the application of forward osmosis (FO) membranes to industrial-level water treatment, the correct selection of the draw solute (DS) and good membrane performance is necessary. In this study, the FO flux behavior was investigated using draw solutes of inorganic salt (NaCl) and neutral polymers (PEGs) with molecular weights of 200-8300. The FO flux dramatically decreased with increasing molecular weight of the DS. Severe internal concentration polarization originated from the lower diffusivity of the larger DS molecules, which brought about the flux reduction. The experimental data were analyzed with a model developed using a virial expansion equation for osmotic pressure in the case of the polymeric draw solutions. The analyzed results fit well with the experimental data, which allowed us to predict a relation between FO performance and the molecular weights of the draw solutes for different FO membranes.",

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T1 - Effect of molecular weight of draw solute on water permeation in forward osmosis process

AU - Yasukawa, Masahiro

AU - Tanaka, Yasuhiro

AU - Takahashi, Tomoki

AU - Shibuya, Masafumi

AU - Mishima, Shoji

AU - Matsuyama, Hideto

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Effect of molecular weight of draw solute on water permeation in forward osmosis process

Abstract

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