High-pressure phase equilibria for the synthesis of ionic liquids in compressed CO2 for 1-hexyl-3-methylimidazolium bromide with 1-bromohexane and 1-methylimidazole

Nwosu, Sylvia O.; Schleicher, Jay C.; Scurto, Aaron M.

doi:10.1016/j.supflu.2009.07.006

Cited by 28 publications

(21 citation statements)

References 26 publications

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“…The critical properties of ionic liquids were taken from Valderrama et al (2007Valderrama et al ( , 2008aValderrama et al ( , 2009), Ren et al (2010) and Nwosu et al (2009). For CO 2 , C 2 H 6 and CHF 3 , the properties were taken from the DIPPR data base (DIADEM, 2000).…”

Section: Resultsmentioning

confidence: 99%

“…The experimental data were taken from the literature Ren et al, 2010;Nwosu et al, 2009;Carvalho et al, 2009aCarvalho et al, , 2009bKroon et al, 2005;Liu et al, 2003;Ren and Scurto, 2009a;Shariati and Peters, 2003;Florusse et al, 2008) and the characteristics of these systems are shown in Table 2. The adjustable parameters, k ij and l ij , the %AARD and the range of experimental data utilized (expressed in pressure and liquid phase molar composition) are shown in Table 3 for all 17 binary systems analyzed here.…”

Section: Resultsmentioning

confidence: 99%

“…Larger deviations in the regions of high pressure were described in other works in the literature (Carvalho et al, 2009a;Nwosu et al, 2009;Ren et al, 2010) and, because of this behavior, the extrapolation of the model much beyond the data pressure region in which the interaction parameters were fit is not recommended.…”

Section: Brazilian Journal Of Chemical Engineeringmentioning

confidence: 94%

“…Phase equilibria in systems composed of ionic liquids + CO 2 were studied by several authors Ren et al, 2010;Nwosu et al, 2009;Carvalho et al, 2009aCarvalho et al, , 2009bKroon et al, 2005;Liu et al, 2003;Blanchard et al, 1999), but few of them have assessed the solubility in ionic liquids of other gases. The phase equilibria of different imidazolium ionic liquids with 1,1,1,2-tetrafluoroethane (R-134a) were studied by Scurto (2009a, 2009b); the authors emphasize the importance of understanding these systems for the separation of hydrofluorocarbon refrigerant gases and in other engineering applications.…”

Section: Brazilian Journal Of Chemical Engineeringmentioning

confidence: 99%

“…This objective function was used in similar works in the literature with good results (Nwosu et al, 2009;Ren and Scurto, 2009;Ren et al, 2010). Several initial guesses were utilized to avoid the local minima in the regression in order to obtain final values for k ij and l ij .…”

Section: Thermodynamic Modelingmentioning

confidence: 99%

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Modeling vapor liquid equilibrium of ionic liquids + gas binary systems at high pressure with cubic equations of state

Freitas

Cunico

Aznar

et al. 2013

Braz. J. Chem. Eng.

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-Ionic liquids (IL) have been described as novel environmentally benign solvents because of their remarkable characteristics. Numerous applications of these solvents continue to grow at an exponential rate. In this work, high pressure vapor liquid equilibria for 17 different IL + gas binary systems were modeled at different temperatures with Peng-Robinson (PR) and Soave-Redlich-Kwong (SRK) equations of state, combined with the van der Waals mixing rule with two binary interaction parameters (vdW-2). The experimental data were taken from the literature. The optimum binary interaction parameters were estimated by minimization of an objective function based on the average absolute relative deviation of liquid and vapor phases, using the modified Simplex algorithm. The solubilities of all gases studied in this work decrease as the temperature increases and increase with increasing pressure. The correlated results were highly satisfactory, with average absolute relative deviations of 2.10% and 2.25% for PR-vdW-2 and SRK-vdW-2, respectively.

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