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Licensed Unlicensed Requires Authentication Published by De Gruyter (O) January 28, 2013

Effect of Water on the Densities and Viscosities of Some Ionic Liquids Containing a Phosphonium Cation

Brian Yoo , Waheed Afzal and John M. Prausnitz


A small amount of water can significantly decrease the viscosity of an ionic liquid. From 25–80 ºC, densities and viscosities were measured for dilute solutions of water in six ionic liquids: trihexyltetradecylphosphonium bis(2,4,4-trimethylpentyl)phosphinate, trihexyltetradecylphosphonium dicyanamide, tributyltetradecylphosphonium dodecylbenzenesulfonate, 1-ethyl,3-methylimidazolium bis(triflouromethylsulfonyl)imide, methyltrioctylammonium bis(trifluoromethylsulfonyl)imide, and triisobutylmethylphosphonium tosylate. At 25 ºC, when the water content is about 1 wt. %, the viscosity of a phosphonium-based ionic liquid is reduced by nearly one order of magnitude.

* Correspondence address: University of California, Department of Chemical a. Biomolecular Engineering, Lawrence Berkeley National Laboratory, Environmental Energy Technologies Division, Berkeley CA 94720-1462, U.S.A.,

Published Online: 2013-1-28
Published in Print: 2013-3-1

© by Oldenbourg Wissenschaftsverlag, München, Germany

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