Ionic liquid membrane separation

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]

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]

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]

Scovazzo P (2009) Determination of the upper limits, benchmarks, and critical properties for gas separations using stabilized room temperature ionic liquid membranes (SILMs) for the purpose of guiding future research. J Membr Sci 343 199-211... [Pg.168]

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]

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]

Fig. 5.6-11 Lipase facilitated separation of carboxylic acids using a supported ionic liquid membrane [118].

Ionic liquids in separations including extractions, gas chromatography, and supported liquid membrane processes 07ACR1079. [Pg.25]

Supported ionic liquid membranes (SILMs) have been recently brought into focus due to their unique properties that can prevent the loss of solvent by evaporation. Ionic liquids (ILs) are organic salts with negligible vapor pressures. They are thermally robust with a wide temperature range in the liquid state, for example, up to 300°C, compared to 100°C for water, and their polarity and hydrophilicity/ hydrophobicity can be tuned by a suitable combination of cation and anion. Noble et al. have extensively studied SILMs for CO2 separation, including the gelation of SILMs. Excellent CO2 separation performance has been reported [127-129],... [Pg.160]

Application of Ionic Liquid Membranes to Organic Compounds and Metal Ion Separation. [Pg.615]

A.P. de los Rfos, F.J. Hernandez-Ferndndez, H. Presa et al.. Tailoring supported ionic liquid membranes for the selective separation of transesterification reaction compounds. J. Membr. Sci. 328 (2009) 81-85. [Pg.626]

A. Panigrahi, S. Raju Pilli, K. Mohanty, Selective separation of Bisphenol A from aqueous solution using supported ionic liquid membrane. Sep. Purif. Technol. 107 (2013) 70-78. [Pg.627]

Ionic Liquid Membranes for Carbon Dioxide Separation... [Pg.185]

Ionic Liquid Membranes for Carbon Dioxide Separation 195 423 373 K 34 323 310... [Pg.195]

Jiang YY, Zhou Z, Jiao Z, Li L, Wu YT, Zhang ZB (2007) SOj gas separation using supported ionic liquid membranes. J Phys Chem B 111 5058-5061... [Pg.129]

Membrane processes offer another attractive option to apply ionic liquids in separation processes. Two general approaches have been reported the use of ionic liquids as bulk ionic liquid membranes (BILM) [131,132] or as supported ionic liquid membranes (SILM) [133, 134]. In the former case, the ionic liquid acts as selective separation layer in the latter case, the membrane supports the liquid separation layer and separates two conpartments, resulting in a very efficient ionic liquid use and separation unit. Reported exanples for SILMs include reactions with in situ product removal [135], extraction of bioorganic substances [136,137] and removal of CO2 and SO2 from gas streams [138,139]. SILMs have also been successfully... [Pg.197]

Liquid membrane separation systems possess great potential for performing cation separations. Many factors influence the effectiveness of a membrane separation system including complexation/ decomplexation kinetics, membrane thickness, complex diffusivity, anion type, solvent type, and the use of ionic additives. The role that each of these factors plays in determining cation selectivity and flux is discussed. In an effort to arrive at a more rational approach to liquid membrane design, the effect of varying each of these parameters is established both empirically and with theoretical models. Finally, several general liquid membrane types are reviewed, and a novel membrane type, the polymeric inclusion membrane, is discussed. [Pg.57]

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