TY - JOUR
T1 - Phase equilibria of toluene/heptane with deep eutectic solvents based on ethyltriphenylphosphonium iodide for the potential use in the separation of aromatics from naphtha
AU - Kareem, Mukhtar A.
AU - Mjalli, Farouq S.
AU - Hashim, Mohd Ali
AU - Hadj-Kali, Mohamed K.O.
AU - Ghareh Bagh, Fatemeh Saadat
AU - Alnashef, Inas M.
N1 - Funding Information:
The authors present their gratitude for the University of Malaya Center for Ionic Liquids for hosting the research activities at their labs. This research was funded by University of Malaya research Grant Number HIR-MOHE D000003-16001 and by the Deanship of Scientific Research at King Saud University through group project No. RGP-VPP-108 in collaboration with the Petroleum and Chemical Engineering Department, engineering faculty in Sultan Qaboos University, Oman.
PY - 2013
Y1 - 2013
N2 - In this work, the liquid-liquid extraction of toluene from hydrocarbons mixtures (toluene/heptane) was investigated using deep eutectic solvents as solvents. Ethyltriphenylphosphonium iodide as a salt with either ethylene glycol or sulfolane as hydrogen-bond donors (HBDs) were utilized for synthesizing six DESs. (Liquid + liquid) equilibria data were determined experimentally for the ternary system (toluene + heptane + DES) at (30, 40, 50, and 60) C and atmospheric pressure. Hand correlation was applied to establish the reliability of the experimental data. In many cases the correlation factor is found close to unity which indicates high reliability of the data. The selectivities and distribution coefficients were used to determine the suitability of these DESs as solvents for this extraction process. Higher selectivities than those published for sulfolane as a commercial solvent were observed. The DES made from ethyltriphenylphosphonium iodide and sulfolane at salt:HBD of 1:4 showed the best separation capability at 30 C. Thus, it was further characterized by measuring its viscosity and refractive index at a range of temperatures to help understand its physical behaviour needed for process design. The non-random two-liquid (NRTL) model was applied successfully to correlate the experimental tie-lines and to calculate the phase compositions of the ternary systems. It has been found that the third non-randomness parameter varies linearly with the HBD number of moles.
AB - In this work, the liquid-liquid extraction of toluene from hydrocarbons mixtures (toluene/heptane) was investigated using deep eutectic solvents as solvents. Ethyltriphenylphosphonium iodide as a salt with either ethylene glycol or sulfolane as hydrogen-bond donors (HBDs) were utilized for synthesizing six DESs. (Liquid + liquid) equilibria data were determined experimentally for the ternary system (toluene + heptane + DES) at (30, 40, 50, and 60) C and atmospheric pressure. Hand correlation was applied to establish the reliability of the experimental data. In many cases the correlation factor is found close to unity which indicates high reliability of the data. The selectivities and distribution coefficients were used to determine the suitability of these DESs as solvents for this extraction process. Higher selectivities than those published for sulfolane as a commercial solvent were observed. The DES made from ethyltriphenylphosphonium iodide and sulfolane at salt:HBD of 1:4 showed the best separation capability at 30 C. Thus, it was further characterized by measuring its viscosity and refractive index at a range of temperatures to help understand its physical behaviour needed for process design. The non-random two-liquid (NRTL) model was applied successfully to correlate the experimental tie-lines and to calculate the phase compositions of the ternary systems. It has been found that the third non-randomness parameter varies linearly with the HBD number of moles.
KW - Aromatics separation
KW - Deep eutectic solvents
KW - Ionic liquids analogues
KW - Liquid-liquid extraction
KW - Phosphonium salts
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U2 - 10.1016/j.jct.2013.05.046
DO - 10.1016/j.jct.2013.05.046
M3 - Article
AN - SCOPUS:84879478631
SN - 0021-9614
VL - 65
SP - 138
EP - 149
JO - Journal of Chemical Thermodynamics
JF - Journal of Chemical Thermodynamics
ER -