Supported ionic liquid membranes

Ionic liquids have already been demonstrated to be effective membrane materials for gas separation when supported within a porous polymer support. However, supported ionic liquid membranes offer another versatile approach by which to perform two-phase catalysis. This technology combines some of the advantages of the ionic liquid as a catalyst solvent with the ruggedness of the ionic liquid-polymer gels. Transition metal complexes based on palladium or rhodium have been incorporated into gas-permeable polymer gels composed of [BMIM][PFg] and poly(vinyli-dene fluoride)-hexafluoropropylene copolymer and have been used to investigate the hydrogenation of propene [21]. [Pg.266]

Peng, J.-R, Liu, J.-R, Hu, J.-T., and Jiang, G.-B., Direct determination of chlorophenols in environmental water samples by hollow fiber supported ionic liquid membrane extraction coupled with high-performance liquid chromatography, J. Chromatogr. A, 1139,165-170, 2007. [Pg.180]

Another emerging technique which deserves mention is the use of a supported ionic liquid membrane. This involves two liquid phases that both contain an enzyme and are separated by the membrane. Lipase-catalyzed esterification takes place in the feed phase to afford a mixture of the (R)-acid and the (S)-ester (Figure 10.22). The latter diffuses through the membrane and is hydrolyzed in the receiving phase to afford the (S)-acid [151, 152]. The methodology has been applied, for example, to the resolution of ibuprofen [151]. [Pg.247]

Figure 10.22 Supported ionic liquid membrane in the enzymatic resolution of ibuprofen.

Scovazzo P, Kieft J, Finan DA et al (2004) Gas separations using non-hexafluorophosphate [PF6] anion supported ionic liquid membranes. J Membr Sci 238(l-2) 57-63... [Pg.52]

Catalytically active supported ionic liquid membranes were used for propylene/propane vapor mixture separation. In this case, the ionic Hquid was immobilized in the pores of an asymmetric ceramic support, displaying sufficient permeability, good selectivity, and long-term stabUity [51]. Porous inorganic membranes were also used as a support for chiral-selective liquid membranes. For this purpose, porous tubular ceramic membranes were impregnated with 3-cyclodextrin polymer. Such SLMs were used for separation of enantiomers of racemic pharmaceutical chlorthahdone [52]. [Pg.98]

KruU, F. F., Medved, M., Melin, T. (2007). Novel supported ionic liquid membranes for simultaneous homogeneously catalyzed reaction and vapor separation. Chem. Eng. Sci., 62, 5579-85. [Pg.130]

Table 7.3 shows a classification of the liquid membranes on the basis of the configuration and module types employed in gas separation. The liquid membranes can be divided in three main classes (i) supported liquid membrane (SLM), (ii) bulk liquid membrane (BLM), and (iii) supported ionic liquid membrane (SILM). [Pg.332]

Park Y-I, Kim B-S, Byun Y-H et al (2009) Preparation of supported ionic liquid membranes (SILMs) for the removal of acidic gases from crude natural gas. Desalination 236 342-348... [Pg.168]

Supported Ionic Liquid Membranes Preparation, Stability and Applications... [Pg.275]

Here, a review on supported ionic liquid membrane technology including issues such as methods of preparation and characterization, stability, transport mechanisms and applications is presented. [Pg.277]

Methods of Preparation and Characterization of Supported Ionic Liquid Membranes... [Pg.277]

The EDX spectrum of the nylon membrane (not shown) presents the characteristic peaks assigned to the C, O and N Ka lines, the last two as a single broad peak unresolved due to their proximity and small concentration. The presence of these chemical elements corresponds to the chemical formulation of polyamide [26]. The EDX study of supported ionic liquid membranes is based on the selection of characteristic elements of interest in each ionic liquid, for example F and P for [bmimq... [Pg.277]

The nature of the supporting membrane also plays an important role in the performance of supporting ionic liquid membranes. In this context, de los Rios et al. [3] nsed two polymeric membranes, nylon and mitex, as supporting membranes. Nylon membrane was a hydrophilic polyamide membrane with a pore size of 0.45 pm and a thickness of 170 pm. Mitex membrane was a hydrophobic polytetrafluoroethylene membrane with a pore size of 10 pm and a thickness of 130 pm. It was observed that less ionic liquid was absorbed into the mitex membranes, which was explained by the different textural properties and the high hydrophobic character of these membranes, which probably restrict interaction with the hydrophilic ionic liquids used [27]. [Pg.279]

The transport mechanism of gases through supported ionic liquid membranes has also been studied by several workers [24,28,36]. The basic governing principle in solution-diffusion-based mass transport process applicable to gas separation in ionic liquids is embodied in the Eq. 11.4 ... [Pg.283]

The use of supported ionic liquid membranes in different fields of application has received growing attention during last decade. One of the most studied applications of SILMs is the selective separation of organic compounds. The first example was reported by Branco et al. [18], who studied the selective transport of 1,4-dioxane,... [Pg.284]

Supported ionic liquid membranes have also found application in analytical chemistry, specifically in the trace determination of toxic substances. Several examples of the application of ionic liquids as liquid membrane in hollow fibre-supported liquid-phase nuCToextraction have been reported [50,51 ]. This technique, combined with high-performance liquid chromatography was used for (he determination of chlorophenols and sulphonamides in environmental water samples. [Pg.285]

Fortunate R, Afonso CAM, Benavente J, Rodriguez-CasteUon E, Crespo IG (2005) Stability of supported ionic liquid membranes as studied by x-ray photoelectron spectroscopy. 1 Membr Sci 256 216-223... [Pg.286]

Myers C, Pennline H, Luebke D, llconichb J, Dixon JK, Maginn EJ, Brennecke JF (2008) High temperature separation of carbon dioxide/hydrogen mixtures using facilitated supported ionic liquid membranes. J Membr Sci 322 28-31... [Pg.287]

Hernindez-Femandez FJ, de los Rios AP, Tomis-Alonso F, G6mez D, Vfllora G (2007) Kinetic resolution of 1-phenylethanol integrated with separation of substrates and products by a supported ionic liquid membrane. J Chem Technol Biotechnol 82 190-195... [Pg.287]

Hemdndez-Femdndez FJ, de los Rfos AP, TomSs-Alonso F, G6mez D, Vfllora G (2009) Improvement in the separation efficiency of transesterification reaction compounds by the use of supported ionic liquid membranes based on the dicyanamide anion. Desalination 244 122-129... [Pg.288]

IzakP, Kbckerhng M, KraglU(2006) Solute transport from aqueous mixture through supported ionic liquid membrane by pervaporation. Desalination 199 96-98... [Pg.288]

Tao Y, Liu J, Hu X, Li H, Wang T, Jiang G (2009) Hollow fiber supported ionic liquid membrane microextraction for determination of sulfonamides in environmental water samples by high-performance liquid chromatography. J Chromatogr A 1216 6259-6266... [Pg.288]

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