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Molecular aspects of temperature swing solvent extraction for brine desalination using imidazole-based solvents

Journal Article · · Chemical Engineering Science
 [1];  [2];  [2];  [2]
  1. University of Alabama, Tuscaloosa, AL (United States); OSTI
  2. University of Alabama, Tuscaloosa, AL (United States)

Solvent extraction desalination has shown to be a promising energy-efficient technique when compared to separation processes usually employed. Despite the remarkable impact of the organic solvent’s molecular characteristics on this process, few studies have been carried out so far to explicitly ascertain the influence of these characteristics on the solubility of water in the solvent. In this report we assess the viability of four different imidazole-based solvents and compare them to an amine compound for solvent extraction desalination of high salinity brines. All-atom molecular simulations of pure solvent and water-solvent bulk mixtures are used to ascertain the influence of the solvents’ molecular structures on solvent–solvent and solvent–water interaction. Our results show that water solubilization in imidazole-based solvents is an endothermic process, while for a secondary amine (diisopropylamine) it is an exothermic process. We show that imidazole-based solvents can be designed to provide characteristics favorable to brine desalination.

Research Organization:
University of South Alabama, Mobile, AL (United States); University of Alabama, Tuscaloosa, AL (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0020282
OSTI ID:
1976945
Alternate ID(s):
OSTI ID: 1868657
Journal Information:
Chemical Engineering Science, Journal Name: Chemical Engineering Science Journal Issue: C Vol. 247; ISSN 0009-2509
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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