Forward osmosis using draw solutions manifesting liquid-liquid phase separation

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Abstract

Desalination via forward osmosis using draw agents whose regeneration is aided via liquid-liquid phase separation has gained much attention in recent years. In the present study, mixtures of two different glycol ethers, tripropylene glycol methyl ether and tripropylene glycol n-butyl ether, have been studied as potential draw agents. Water activity, viscosity and diffusion coefficient of draw solutions have been measured at different mixture compositions, concentrations and temperatures. Osmotic pressures of these draw solutions decreases strongly with increasing temperature. Forward osmosis experiments performed with these draw solutions reveal appreciable initial loss of trans-membrane water flux, reverse solute flux and severe concentration polarization.

Original languageEnglish (US)
Pages (from-to)23-31
Number of pages9
JournalDesalination
Volume421
DOIs
StatePublished - Nov 1 2017

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Mechanical Engineering
  • Chemistry(all)
  • Materials Science(all)
  • Water Science and Technology

Keywords

  • Forward osmosis
  • Glycol ethers
  • Liquid-liquid phase separation
  • Lower critical solution temperature

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