A. P. de los Ríos

(Liquid +Liquid) Equilibrium for Ternary Systems Containing of an Ionic Liquid, n-Hexane and an Organic Compound Involved in the Kinetic Resolution of rac-2-Pentanol

In this paper, (liquid +liquid) equilibrium (LLE) data for 12 ternary systems containing an ionic liquid + n-hexane +an organic compound involved in the racemic resolution of rac-2-pentanol (rac-2-pentanol, vinyl butyrate, rac-2-pentyl butyrate, or butyric acid) have been experimentally determined at 298.2 K and atmospheric pressure. The ionic liquids used were i. 1-ethyl-3-methylimidazolium ethylsulfate, [emim+] [EtSO4 −]; ii. 1-butyl-3–methylimidazolium tetrafluoroborate, [bmim+][BF4 −] and iii. 1-butyl-3-methylimidazolium bis{(trifluoromethyl)sulfonyl}imide, [bmim+][NTf2 −]. The binodal curves and the tie line compositions of the conjugate solutions were obtained by means of refractive index (ionic liquid rich phase) and by gas cromatography (hexane rich phase) to determine their potential for selectively extracting organic compounds from an ionic liquid reaction mixture. The tie line data were correlated through the use of the Non-Random Two-Liquid (NRTL) model for statistical consistency, which provides excellent agreement with the experimental measurements. There are no literature data for the mixtures discussed in this paper.

Ionic Liquids/Supercritical Carbon Dioxide as Advantageous Biphasic Systems in Enzymatic Synthesis

Ionic liquids/supercritical carbon dioxide (ILs/scCO2) biphasic systems have recently proved as interesting clean alternatives to classical organic solvents in enzymatic synthesis. The success of IL/scCO2 biphasic systems is based on the fact that ILs provide an adequate microenvironment for the catalytic activity of the enzyme, while supercritical carbon dioxide acts as extracting phase, making possible the easy recovery of the products. This new methodology avoids the use of volatile organic solvents and hence is considered as a green technology. In this chapter, the properties of ionic liquids/supercritical carbon dioxide biphasic systems for enzymatic applications have been examined.