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http://dx.doi.org/10.14579/MEMBRANE_JOURNAL.2018.28.4.286

Synthesis of New Draw Solute Based on Polyethyleneimine for Forward Osmosis  

Lee, Hye-Jin (Center for Membrane, Advanced Materials Division, Korea Research Institute of Chemical Technolgy)
Choi, Jin-Il (Center for Small & Medium Enterprises Support, Technology Commercialization Division, Korea Research Institute of Chemical Technolgy)
Kwon, Sei (Center for Membrane, Advanced Materials Division, Korea Research Institute of Chemical Technolgy)
Kim, In-Chul (Center for Membrane, Advanced Materials Division, Korea Research Institute of Chemical Technolgy)
Publication Information
Membrane Journal / v.28, no.4, 2018 , pp. 286-295 More about this Journal
Abstract
A novel multi-valent salt based on polyethyleneimine having molecular weight of 800 (PEI 800) has been synthesized and characterized as forward osmosis draws solute. A reaction intermediate was synthesized by the neutralization reaction of polyethyleneimine and methyl acrylate, and was hydrolyzed with potassium hydroxide to synthesize a water soluble carboxylic acid (potassium salt) polyethyleneimine. NMR spectrometry, viscometry measurements and osmometry measurements was performed to characterize the draw solute. Forward osmosis experiments were done to know whether the solute could be used as a draw solute or not. The result shows comparable water flux and lower reverse salt flux compared with NaCl as a draw solute. We have also demonstrated recycling of the draw solute in the FO-NF integrated process.
Keywords
Forward Osmosis; Nanofiltration; Draw solute; Polyethylene imine; Water flux;
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