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Using Reverse Osmosis Membrane at High Temperature for Water Recovery and Regeneration from Thermo-Responsive Ionic Liquid-Based Draw Solution for Efficient Forward Osmosis
| Content Provider | MDPI |
|---|---|
| Author | Kamio, Eiji Kurisu, Hiroki Takahashi, Tomoki Matsuoka, Atsushi Yoshioka, Tomohisa Nakagawa, Keizo Matsuyama, Hideto |
| Copyright Year | 2021 |
| Description | Forward osmosis (FO) membrane process is expected to realize energy-saving seawater desalination. To this end, energy-saving water recovery from a draw solution (DS) and effective DS regeneration are essential. Recently, thermo-responsive DSs have been developed to realize energy-saving water recovery and DS regeneration. We previously reported that high-temperature reverse osmosis (RO) treatment was effective in recovering water from a thermo-responsive ionic liquid (IL)-based DS. In this study, to confirm the advantages of the high-temperature RO operation, thermo-sensitive IL-based DS was treated by an RO membrane at temperatures higher than the lower critical solution temperature (LCST) of the DS. Tetrabutylammonium 2,4,6-trimethylbenznenesulfonate $([N_{4444}$][TMBS]) with an LCST of 58 °C was used as the DS. The high-temperature RO treatment was conducted at 60 °C above the LCST using the $[N_{4444}$][TMBS]-based DS-lean phase after phase separation. Because the $[N_{4444}$][TMBS]-based DS has a significantly temperature-dependent osmotic pressure, the DS-lean phase can be concentrated to an osmotic pressure higher than that of seawater at room temperature (20 °C). In addition, water can be effectively recovered from the DS-lean phase until the DS concentration increased to 40 wt%, and the final DS concentration reached 70 wt%. From the results, the advantages of RO treatment of the thermo-responsive DS at temperatures higher than the LCST were confirmed. |
| Starting Page | 588 |
| e-ISSN | 20770375 |
| DOI | 10.3390/membranes11080588 |
| Journal | Membranes |
| Issue Number | 8 |
| Volume Number | 11 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-07-31 |
| Access Restriction | Open |
| Subject Keyword | Membranes Environmental Engineering Environmental Sciences Forward Osmosis Membrane Process Thermo-responsive Draw Solution Ionic Liquid Lower Critical Solution Temperature Osmotic Pressure |
| Content Type | Text |
| Resource Type | Article |
