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Ionic Liquids Derived from Proline: Application as Surfactants
Author(s) -
FernándezStefanuto Verónica,
Corchero Raquel,
RodríguezEscontrela Iria,
Soto Ana,
Tojo Emilia
Publication year - 2018
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201800735
Subject(s) - ionic liquid , surface tension , sodium dodecylbenzenesulfonate , pulmonary surfactant , chemistry , hydrolysis , ionic bonding , chemical engineering , sodium , ion , organic chemistry , inorganic chemistry , thermodynamics , biochemistry , physics , engineering , catalysis
Ionic liquids derived from prolinium esters, previously described as fully green and stable, were found to decompose in the presence of water by ester hydrolysis. To avoid this problem, a new family of these biodegradable salts incorporating an alcohol instead of the ester group is proposed. From this family, two novel ionic liquids that incorporate the prolinolium cation [HOPro] and the [DS] or [DBS] anion were selected (DS=dodecylsulfate; DBS=dodecylbenzenesulfonate). Both salts are liquid at room temperature, a property not usually found in ionic surfactants, and are also chemically and thermally stable. Moreover, they are more effective in reducing the surface tension of water than the corresponding traditional surfactants in the form of sodium salts, being useful for applications related to their aggregation capacity. They were tested for surfactant enhanced oil recovery and an optimal formulation for reservoirs at high salinity and temperature, able to produce ultra‐low interfacial tension, was found with [HOPro][DBS].