Using UCST Ionic Liquid as a Draw Solute in Forward Osmosis to Treat High-Salinity Water

Abstract

Using UCST ionic liquid as a draw solute in forward osmosis to treat high-salinity water Just Accepted "Just Accepted" manuscripts have been peer-reviewed and accepted for publication. They are posted online prior to technical editing, formatting for publication and author proofing. The American Chemical Society provides "Just Accepted" as a free service to the research community to expedite the dissemination of scientific material as soon as possible after acceptance. "Just Accepted" manuscripts appear in full in PDF format accompanied by an HTML abstract. "Just Accepted" manuscripts have been fully peer reviewed, but should not be considered the official version of record. They are accessible to all readers and citable by the Digital Object Identifier (DOI®). "Just Accepted" is an optional service offered to authors. Therefore, the "Just Accepted" Web site may not include all articles that will be published in the journal. After a manuscript is technically edited and formatted, it will be removed from the "Just Accepted" Web site and published as an ASAP article. Note that technical editing may introduce minor changes to the manuscript text and/or graphics which could affect content, and all legal disclaimers and ethical guidelines that apply to the journal pertain. ACS cannot be held responsible for errors or consequences arising from the use of information contained in these "Just Accepted" manuscripts. KAUST Repository 1Using UCST ionic liquid as a draw solute in forward osmosis to treat high-salinity water IL-rich phase: the water-rich phase was the produced water that contained a low IL concentration, and the IL-rich phase could be used directly as the draw solution in the next cycle of the FO process. The thermal stability, thermal-responsive solubility and UV-vis absorption spectra of the IL were also studied in detail.

Tetrabutylphosphonium Trifluoroacetate ([P4444]cf3coo) Thermoresponsive Ionic Liquid as a Draw Solution for Forward Osmosis Process

“…Oppositely, in UCST IL, water will dissolve above its critical temperature. Cai et al [7] [8] and was able to draw up to 3.0 M NaCl feed solution. Water solubility of IL is mainly affected by anion and varies accordingly.…”

A Thermodynamical Approach for Evaluating Energy Consumption of the Forward Osmosis Process Using Various Draw Solutes

“…Besides using heat sources, the recovery of draw solutes can also be achieved by cooling. Zhong et al employed ionic liquid with an upper critical solution temperature as the draw solute [19]. In the proposed process by Zhong et al, the FO process is operated at 60 • C while the draw solute recovery is carried out via cooling to room temperature.…”

Osmotic's potential: An overview of draw solutes for forward osmosis

“…The energy requirement for the FO process plus regeneration was estimated to be significantly lower than for a similar separation performed using RO. Zhong et al[89] used a thermally responsive ionic liquid as a draw agent. The 3.2 M solution of protonated betaine bis(trifluoromethylsulfonyl)imide was capable of drawing water from 3.0 M saline water, with the temperature maintained at a constant 56 °C.…”