Benzene and Cyclohexane Separation Using 1-Propanenitrile-3-butylimidazolium Dicyanamide Ionic Liquid

Abstract:

Cyclohexane is mainly produced by catalytic hydrogenation of benzene, and the separation of unreacted benzene is very important process. However, the separation of benzene and cyclohexane mixture is one of the difficult separation processes in petrochemical industry. Presently, extractive distillation is commercially used to separate benzene and cyclohexane using molecular solvents. However, the current process suffers from process complexity and high-energy consumption. In this work, new ionic liquid, 1-propanenitrile-3-butylimidazolium dicyanamide was synthesized and applied for separation benzene and cyclohexane mixture. Some of the thermophysical properties of the ionic liquid were measured. The vapour- liquid equilibrium and relative volatility of the components were determined. The ionic liquid breaks the azeotropic mixture and increased the relative volatility of cyclohexane to benzene.

• Periodical: Advanced Materials Research (Volume 879)
• Pages: 58-62
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.879.58
• Online since: January 2014
• Authors: Bustam-Khalil Mohamad Azmi, Abdul Hannan Muhamad, Girma Gonfa, Zakaria Man
• Keywords: Benzene, Cyclohexane, Ionic Liquid (IL)

References

[1] Garcia Villaluenga, J.P. and A. Tabe-Mohammadi, A review on the separation of benzene/cyclohexane mixtures by pervaporation processes. J. Membr. Sci., 2000. 169(2): pp.159-174.

DOI: 10.1016/s0376-7388(99)00337-3

[2] Lei, Z., B. Chen, and Z. Ding, Special distillation processes. first edition ed. 2005: Elsevier.

[3] Diedenhofen, M. and A. Klamt, COSMO-RS as a tool for property prediction of IL mixtures-A review. Fluid Phase Equilib., 2010. 294(1): pp.31-38.

DOI: 10.1016/j.fluid.2010.02.002

[4] Eckert, F., COSMOtherm Users Manual. 2010. Version C2.1 Release 01.11.

[5] Becke, A.D., Density-functional exchange-energy approximation with correct asymptotic behavior. Phys. Rev. A, 1988. 38(6): pp.3098-3100.

DOI: 10.1103/physreva.38.3098

[6] Schäfer, A., C. Huber, and R. Ahlrichs, Fully optimized contracted Gaussian basis sets of triple zeta valence quality for atoms Li to Kr. J. Chem. Phys., 1994. 100: p.5829.

DOI: 10.1063/1.467146

[7] Ziyada, A.K., et al., Thermophysical properties of 1-propyronitrile-3-alkylimidazolium bromide ionic liquids at temperatures from (293.15 to 353.15) K. J. Chem. Eng. Data, 2010. 55(9): pp.3886-3890.

DOI: 10.1021/je901050v

[8] Kolb, B. and L.S. Ettre, Static headspace-gas chromatography: theory and practice. 2nd edition ed. 2006, New Jersy: John Wiley & Sons.

DOI: 10.1002/0471914584

[9] Muhammad, N., et al., Thermophysical Properties of Dual Functionalized Imidazolium-Based Ionic Liquids. J. Chem. Eng. Data, 2012. 57(3): pp.737-743.

DOI: 10.1021/je200710t

[10] Deetlefs, M., K.R. Seddon, and M. Shara, Predicting physical properties of ionic liquids. Phys. Chem. Chem. Phys, 2006. 8(5): pp.642-649.

DOI: 10.1039/b513453f

[11] Costa, A.J., et al., Densities and viscosities of 1-ethyl-3-methylimidazolium n-alkyl sulfates. J. Chem. Eng. Data, 2011. 56(8): pp.3433-3441.

DOI: 10.1021/je200434a