期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 16, 期 11, 页码 5319-5325出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3cp55467h
关键词
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资金
- Mid-career Researcher Program [2011-0013569]
- Ministry of Science, ICT and Future Planning, Korea
- GAIA project [G113-00055-3004-0]
- Ministry of Environment, Korea
Lower critical solution temperature (LCST) phase transition of glycol ether (GE)-water mixtures induces an abrupt change in osmotic pressure driven by a mild temperature change. The temperature-controlled osmotic change was applied for the forward osmosis (FO) desalination. Among three GEs evaluated, di(ethylene glycol) n-hexyl ether (DEH) was selected as a potential FO draw solute. A DEH-water mixture with a high osmotic pressure could draw fresh water from a high-salt feed solution such as seawater through a semipermeable membrane at around 10 1C. The water-drawn DEH-water mixture was phase-separated into a water-rich phase and a DEH-rich phase at around 30 degrees C. The water-rich phase with a much reduced osmotic pressure released water into a low-salt solution, and the DEH-rich phase was recovered into the initial DEH-water mixture. The phase separation behaviour, the residual GE concentration in the water-rich phase, the osmotic pressure of the DEH-water mixture, and the osmotic flux between the DEH-water mixture and salt solutions were carefully analysed for FO desalination. The liquid-liquid phase separation of the GE-water mixture driven by the mild temperature change between 10 1C and 30 1C is very attractive for the development of an ideal draw solute for future practical FO desalination.
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