Solute displacement in the aqueous phase of water–NaCl–organic ternary mixtures relevant to solvent-driven water treatment
Twelve water miscible organic solvents (MOS): acetone, tetrahydrofuran, isopropanol, acetonitrile, dimethylsulfoxide, 1,4-dioxane, dimethylacetamide,N-methyl-2-pyrrolidone, trifluoroethanol, isopropylamine,dimethylformamide, and dimethyl ether (DME) were used to produce ternary mixtures of water–NaC...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Royal Society of Chemistry (RSC)
2020
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| Online Access: | https://hdl.handle.net/1721.1/127216 |
| _version_ | 1811091194591051776 |
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| author | McNally, Joshua S. Foo, Zi Hao Deshmukh, Akshay P Orme, Christopher J. Lienhard, John H Wilson, Aaron D. |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering McNally, Joshua S. Foo, Zi Hao Deshmukh, Akshay P Orme, Christopher J. Lienhard, John H Wilson, Aaron D. |
| author_sort | McNally, Joshua S. |
| collection | MIT |
| description | Twelve water miscible organic solvents (MOS): acetone, tetrahydrofuran, isopropanol, acetonitrile, dimethylsulfoxide, 1,4-dioxane, dimethylacetamide,N-methyl-2-pyrrolidone, trifluoroethanol, isopropylamine,dimethylformamide, and dimethyl ether (DME) were used to produce ternary mixtures of water–NaCl–MOS relevant to MOS-driven fractional precipitation. The aqueous-phase composition of the ternarymixture at liquid–liquid equilibrium and liquid–solid endpoint was established through quantitativenuclear magnetic resonance and mass balance. The results highlight the importance of considering thehydrated concentrations of salts and suggest that at high salt concentrations and low MOSconcentration, the salt concentration is governed by competition between the salt ions and MOSmolecules. Under these conditions a LS phase boundary is established, over which one mole of salt isreplaced by one mole of MOS (solute displacement). At higher MOS concentrations, MOS with higherwater affinity deviate from the one-to-one solute exchange but maintain a LS boundary witha homogenous liquid phase, while MOS with lower water affinity form a liquid–liquid phase boundary.DME is found to function effectively as an MOS for fractional precipitation, precipitating 97.7% of theCaSO4from a saturated solution, a challenging scalant. DME-driven water softening recycles the DMEwithin the system improving the atom-efficiency over existing seawater desalination pretreatments byavoiding chemical consumption. |
| first_indexed | 2024-09-23T14:58:26Z |
| format | Article |
| id | mit-1721.1/127216 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T14:58:26Z |
| publishDate | 2020 |
| publisher | Royal Society of Chemistry (RSC) |
| record_format | dspace |
| spelling | mit-1721.1/1272162020-12-10T21:44:27Z Solute displacement in the aqueous phase of water–NaCl–organic ternary mixtures relevant to solvent-driven water treatment McNally, Joshua S. Foo, Zi Hao Deshmukh, Akshay P Orme, Christopher J. Lienhard, John H Wilson, Aaron D. Massachusetts Institute of Technology. Department of Mechanical Engineering Twelve water miscible organic solvents (MOS): acetone, tetrahydrofuran, isopropanol, acetonitrile, dimethylsulfoxide, 1,4-dioxane, dimethylacetamide,N-methyl-2-pyrrolidone, trifluoroethanol, isopropylamine,dimethylformamide, and dimethyl ether (DME) were used to produce ternary mixtures of water–NaCl–MOS relevant to MOS-driven fractional precipitation. The aqueous-phase composition of the ternarymixture at liquid–liquid equilibrium and liquid–solid endpoint was established through quantitativenuclear magnetic resonance and mass balance. The results highlight the importance of considering thehydrated concentrations of salts and suggest that at high salt concentrations and low MOSconcentration, the salt concentration is governed by competition between the salt ions and MOSmolecules. Under these conditions a LS phase boundary is established, over which one mole of salt isreplaced by one mole of MOS (solute displacement). At higher MOS concentrations, MOS with higherwater affinity deviate from the one-to-one solute exchange but maintain a LS boundary witha homogenous liquid phase, while MOS with lower water affinity form a liquid–liquid phase boundary.DME is found to function effectively as an MOS for fractional precipitation, precipitating 97.7% of theCaSO4from a saturated solution, a challenging scalant. DME-driven water softening recycles the DMEwithin the system improving the atom-efficiency over existing seawater desalination pretreatments byavoiding chemical consumption. United States. Department of Energy (Contract DE-AC07-05ID14517) 2020-09-09T16:58:31Z 2020-09-09T16:58:31Z 2020-07 2020-09-09T14:08:52Z Article http://purl.org/eprint/type/JournalArticle 2046-2069 https://hdl.handle.net/1721.1/127216 McNally, Joshua S. et al. “Solute displacement in the aqueous phase of water–NaCl–organic ternary mixtures relevant to solvent-driven water treatment.” RSC Advances, 10, 49 (July 2020): 29516–29527 © 2020 The Author(s) en 10.1039/d0ra06361d RSC Advances Creative Commons Attribution 3.0 unported license https://creativecommons.org/licenses/by/3.0/ application/pdf Royal Society of Chemistry (RSC) Royal Society of Chemistry (RSC) |
| spellingShingle | McNally, Joshua S. Foo, Zi Hao Deshmukh, Akshay P Orme, Christopher J. Lienhard, John H Wilson, Aaron D. Solute displacement in the aqueous phase of water–NaCl–organic ternary mixtures relevant to solvent-driven water treatment |
| title | Solute displacement in the aqueous phase of water–NaCl–organic ternary mixtures relevant to solvent-driven water treatment |
| title_full | Solute displacement in the aqueous phase of water–NaCl–organic ternary mixtures relevant to solvent-driven water treatment |
| title_fullStr | Solute displacement in the aqueous phase of water–NaCl–organic ternary mixtures relevant to solvent-driven water treatment |
| title_full_unstemmed | Solute displacement in the aqueous phase of water–NaCl–organic ternary mixtures relevant to solvent-driven water treatment |
| title_short | Solute displacement in the aqueous phase of water–NaCl–organic ternary mixtures relevant to solvent-driven water treatment |
| title_sort | solute displacement in the aqueous phase of water nacl organic ternary mixtures relevant to solvent driven water treatment |
| url | https://hdl.handle.net/1721.1/127216 |
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