Extraction of propylbenzene or butylbenzene from dodecane using 4-methyl-N-butylpyridinium tetrafluoroborate, [mebupy][BF4], as an ionic liquid at different temperatures

AlTuwaim, Mohammad S.; Alkhaldi, Khaled H.A.E.; Fandary, Mohamed S.; Al-Jimaz, Adel S.

doi:10.1016/j.jct.2011.06.009

Cited by 18 publications

(23 citation statements)

References 19 publications

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“…This illustrates that the effect of the cation change has a more prominent influence than the temperature change examined in this study. Figures 4 and 5 also included data of a previous study 13 4 ] than the other systems. In addition, aromatic percentage removal is plotted against α stf in Figure 6 to compare the three systems under consideration with the same previous study.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Extraction of Butylbenzene from Dodecane Using Hexafluorophosphate-Based Ionic Liquids: Effect of Cation Change

et al. 2012

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Three ternary liquid systems, {dodecane + butylbenzene + [bmim]PF 6 , [hmim]PF 6 , or [omim]PF 6 }, were studied at 313 K and 333 K and atmospheric pressure. Equilibrium tie-line data were measured and plotted for all systems. The effects of the alkyl group in 1-alkyl-3-methylimidazolium hexafluorophosphate, temperature, and solvent-to-feed ratio upon solubility, selectivity (S), and distribution coefficient (K) were investigated. The liquid− liquid equilibrium (LLE) data were correlated sufficiently with both universal quasichemical activity coefficient (UNIQUAC) and nonrandom two-liquid (NRTL) models, and the interaction parameters between each of the three pairs of components for the UNIQUAC and the NRTL models were estimated as a function of temperature. The root-mean-square deviations between the correlated results and experimental data were calculated and found to be satisfactory. ■ INTRODUCTIONLiquid−liquid extraction has been widely used to separate aromatics from aliphatic hydrocarbons. It has proven to be more feasible than distillation for hydrocarbons containing 20 wt % to 65 wt % aromatic content, as it does not require hydrogen and is carried out at atmospheric pressure and comparatively low temperatures. 1 This process aims to enhance middle distillate properties such as the smoke point of kerosene, the cetane number of diesel, or the viscosity index of mineral oil.Appreciable research has been devoted to examine the properties of ionic liquids (ILs). They are considered "green solvents" because of their negligible vapor pressure which implies no significant contamination to the atmosphere. On the other hand, ILs demonstrate high thermal/chemical stability, and they are not flammable nor explosive. They also exhibit a wide liquid temperature range. Another key feature of ILs is tailorability of their physicochemical properties by designing different cation−anion combinations to meet specific needs. 2−5 Recent research has shown that a large number of ionic liquids have better selectivity and capacity in the extraction of aromatics from aromatic/aliphatic mixtures than typical solvents such as sulfolane 6,7 and NMP. 8 Meindersma et al. 9 found that [bmim]BF 4 , [mebupy]BF 4 , [mebupy]CH 3 SO 4 , and [emim]C 7 H 7 SO 3 gave higher distribution coefficients of toluene and toluene/heptane selectivities than with sulfolane. They also studied the effect of alkyl chain length in the cation of [emim]BF 4 and [bmim]BF 4 ionic solvents.Arce et al. 10 investigated the effect of alkyl-chain length in the cation of the 1-alkyl-3-methylimidazolium bis{(trifluoromethyl)-sulfonyl}amide on the extraction of benzene from hexane. Poole and Poole 11 reviewed several systems and stated that the cation plays a dominant role in establishing selectivity. This work is a continuation of our research on the extraction of aromatic compounds from alkane/aromatic mixtures in the middle distillate range using ILs as solvents. 12−14 Dodecane and butylbenzene were selected as representatives of the aliphatic and aromatic groups ...

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Section: ■ Experimental Sectionmentioning

confidence: 99%

Extraction of Butylbenzene from Dodecane Using Hexafluorophosphate-Based Ionic Liquids: Effect of Cation Change

et al. 2012

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“…Currently, there are few data published for {[bmim][PF 6 ] + aromatic + n-alkane (C 5 -C 9 )} and hardly any for systems containing carbon number greater than 9 for the aliphatic and/or aromatic compounds [10,11]. This paper is a continuation of our study on liquid-liquid phase equlibria for de-aromatization of Kuwait middle distilled fraction [12][13][14]. Our interest in IL is to provide experimental new LLE data, and to examine the effect of n-alkane chain length, temperature and solvent to feed ratio upon solubility, the per cent removal of aromatic, the distribution ratio (K), and the selectivity (S) for two systems, viz.…”

Section: Introductionmentioning

confidence: 92%

“…The effectiveness of the IL solvent can be expressed by the selectivity (S), which is a measure of the ability of IL to separate propylbenzene from dodecane or tetradecane, and is given by [12]. Figure 3 represents the relationship of the solvent to feed ratio [24][25][26].…”

Section: Distribution Ratio and Selectivitymentioning

confidence: 99%

Evaluation of [bmim][PF6] as an ionic solvent for the extraction of propylbenzene from aliphatic compounds

Fandary

Alkhaldi

Al-Jimaz

et al. 2012

The Journal of Chemical Thermodynamics

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“…Ionic liquids and paraffins have very low mutual solubility, and most ionic liquids are insoluble in paraffin-rich phases with paraffins > C 10 , producing a ready raffinate product without wasting any solvent. − The solubility of paraffin in the ionic-rich phase is also very low, reducing the cost of solvent regeneration by simple flash distillation or stripping . Ionic liquids are nonvolatile, which makes them environmentally attractive alternatives to conventional solvents that contaminate the atmosphere. − They also can be produced in a variety of anion–cation combinations, which allows optimization of the separation process. − …”

Section: Introductionmentioning

confidence: 99%

Effect of Solvent Cation Alkyl-Chain Length on the Separation of Butylbenzene from n-Tetradecane Using Hexafluorophosphate-Based Ionic Liquids at (313.15 and 333.15) K and 101.3 kPa

2018

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The extraction of butylbenzene from n-tetradecane using three ionic solvents ([bmim][PF 6 ], [hmim][PF 6 ], and [omim][PF 6 ]) was studied at two temperatures (313.15 and 333.15 K) and under atmospheric pressure (101.3 kPa). Experimentally determined distribution coefficients (K) and solvent selectivities (S) were plotted against the mole fraction of butylbenzene in the solvent phase; improved results were obtained compared to the conventional solvent, sulfolane. The distribution coefficient and selectivity both increased with increasing alkyl chain length of the 1-alkyl-3-methylimidazolium moiety of the solvent cation. The universal quasichemical model was satisfactorily applied for correlating the experimental liquid−liquid equilibrium data of all three systems. Furthermore, comparison with literature results revealed that the distribution coefficients decreased with increasing paraffin carbon number.

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Extraction of propylbenzene or butylbenzene from dodecane using 4-methyl-N-butylpyridinium tetrafluoroborate, [mebupy][BF4], as an ionic liquid at different temperatures

Cited by 18 publications

References 19 publications

Extraction of Butylbenzene from Dodecane Using Hexafluorophosphate-Based Ionic Liquids: Effect of Cation Change

Extraction of Butylbenzene from Dodecane Using Hexafluorophosphate-Based Ionic Liquids: Effect of Cation Change

Evaluation of [bmim][PF6] as an ionic solvent for the extraction of propylbenzene from aliphatic compounds

Effect of Solvent Cation Alkyl-Chain Length on the Separation of Butylbenzene from n-Tetradecane Using Hexafluorophosphate-Based Ionic Liquids at (313.15 and 333.15) K and 101.3 kPa

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