Surface Tension of 1 ‑ Ethyl-3-methylimidazolium Ethyl Sulfate or 1 ‑ Butyl-3-methylimidazolium Hexa fl uorophosphate with Argon and Carbon Dioxide

Guillermo Reyes, Marcela Cartes, Carlos Rey-Castro, Hugo Segura (Corresponding Author), Andrés Mejía

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Surface tensions of two ionic liquids (IL): 1-ethyl-3-methylimidazolium ethyl sulfate and 1-butyl-3-methylimidazolium hexafluorophosphate in pressurized atmospheres of argon and carbon dioxide have been measured over the temperature range (303 to 366) K and over the pressure range (0.1 to 15) MPa for the case of argon atmosphere and (0.1 to 5) MPa for the case of carbon dioxide atmosphere by using a pendant drop tensiometer. Based on the experimental measurements, the isothermal surface tension of all IL–gas systems studied decreases as the pressure increases, evidencing a gas adsorption at the IL interface. Isobaric surface tension of an IL–gas does not show a general pattern as the temperature increases. In order to verify the isothermal surface behavior, the relative Gibbs adsorption isotherms have been calculated from the surface tension data by using the theoretical Guggenheim model, corroborating the gas adsorption processes at the IL interface. Comparing the relative Gibbs adsorption isotherms, it is possible to conclude that the ILs studied have the capability to adsorb more carbon dioxide than argon. This fact provides relevant information to use the IL as a capturing agent for carbon dioxide and the use of argon to store pure ILs.
Original languageEnglish
Pages (from-to)1203–1211
JournalJournal of Chemical and Engineering Data
Volume58
Issue number5
DOIs
Publication statusPublished - 2013
MoE publication typeA1 Journal article-refereed

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