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Effect of Organic Cosolvents on the Solubility of Ionic Liquids in Supercritical CO<sub>2</sub>

Weize WuCenter for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, ChinaWenjing LiCenter for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, ChinaBuxing HanCenter for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, ChinaTao JiangCenter for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, ChinaDong ShenCenter for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, ChinaZhaofu ZhangCenter for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, ChinaDonghai SunCenter for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, ChinaBo WangCenter for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China

2004en

ABI

Annotatsiya

The solubilities of ionic liquids (ILs) 1-butyl-3- methylimidazolium hexafluorophosphate ([bmim][PF6]) and 1-butyl-3- methylimidazolium tetrafluoroborate ([bmim][BF4]) in supercritical (sc) CO2 with and without organic cosolvents were determined at 40.0 °C and 15.0 MPa. The mole fraction of a cosolvent was up to 0.3. The solubilities of the ILs in sc CO2 + polar cosolvent mixtures increased dramatically as the cosolvent concentration exceeded 10 mol %, but the solubility was extremely low when the concentration of the cosolvent was lower than 10 mol %. The effect of a cosolvent on the solubility of the ILs in sc CO2 depends mainly on its polarity. The stronger the polarity of a cosolvent, the larger the effect. The ability of the mixed cosolvent to enhance the solubility is intermediate between the two pure cosolvents.

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Identifikatorlar

DOI: 10.1021/je034286+

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