Phase equilibria of toluene/heptane with deep eutectic solvents based on ethyltriphenylphosphonium iodide for the potential use in the separation of aromatics from naphtha

Mukhtar A. Kareem, Farouq S. Mjalli, Mohd Ali Hashim, Mohamed K O Hadj-Kali, Fatemeh Saadat Ghareh Bagh, Inas M. Alnashef

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)138-149
Number of pages12
JournalJournal of Chemical Thermodynamics
Volume65
DOIs
Publication statusPublished - 2013

Fingerprint

Heptanes
Naphthas
Toluene
Iodides
Heptane
heptanes
Phase equilibria
eutectics
Eutectics
iodides
toluene
Liquids
liquids
Hydrogen bonds
Ternary systems
hydrogen bonds
ternary systems
Salts
selectivity
salts

Keywords

  • Aromatics separation
  • Deep eutectic solvents
  • Ionic liquids analogues
  • Liquid-liquid extraction
  • Phosphonium salts

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)

Cite this

Phase equilibria of toluene/heptane with deep eutectic solvents based on ethyltriphenylphosphonium iodide for the potential use in the separation of aromatics from naphtha. / Kareem, Mukhtar A.; Mjalli, Farouq S.; Hashim, Mohd Ali; Hadj-Kali, Mohamed K O; Ghareh Bagh, Fatemeh Saadat; Alnashef, Inas M.

In: Journal of Chemical Thermodynamics, Vol. 65, 2013, p. 138-149.

Research output: Contribution to journalArticle

Kareem, Mukhtar A. ; Mjalli, Farouq S. ; Hashim, Mohd Ali ; Hadj-Kali, Mohamed K O ; Ghareh Bagh, Fatemeh Saadat ; Alnashef, Inas M. / Phase equilibria of toluene/heptane with deep eutectic solvents based on ethyltriphenylphosphonium iodide for the potential use in the separation of aromatics from naphtha. In: Journal of Chemical Thermodynamics. 2013 ; Vol. 65. pp. 138-149.
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AU - Hashim, Mohd Ali

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AU - Ghareh Bagh, Fatemeh Saadat

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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.

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