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Liquid–Liquid Equilibrium Data for 1-Ethyl-3-methylimidazolium Acetate–Thiophene–Diesel Compound: Experiments and Correlations

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Abstract

Extraction of thiophene from cyclohexane, isooctane and toluene were performed using the ionic liquid 1-ethyl-3-methylimidazolium acetate ([EMIM][OAc]) at T=298.15 K. The liquid–liquid equilibrium (LLE) experiments were performed on three systems, namely: [EMIM][OAc]–thiophene–cyclohexane, [EMIM][OAc]–thiophene–isooctane and [EMIM][OAc]–thiophene–toluene. The LLE data showed that [EMIM][OAc] has a higher selectivity at low concentration of thiophene and also showed that the hydrocarbon-rich phase is free of ionic liquid. This implies that there will be no cross contamination and the ionic liquid will be a non-pollutant in fuel after extraction. Further, the amount of hydrocarbon in the ionic-liquid-rich phase is very small. This implies that ionic liquid can be regenerated with negligible loss of fuel. LLE data was then correlated using the NRTL and UNIQUAC models. These showed root mean square deviation (RMSD) values of 0.82 % and 1.46 % for the isooctane system, 1.37 % and 1.57 % for the cyclohexane system and 1.39 % and 1.53 % for the toluene system.

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Abbreviations

[EMIM]:

1-Ethyl 3-methylimidazolium

[Tf2N]:

Bis-(trifluoromethylsulfonyl)-imide

[MeSO3]:

Methansalfonate

[EtSO4]:

Ethyl sulfate

[OAc]:

Acetate

[AMIM]:

1-Alkyl-3-methylimidazolium

[AlCl3-TMAC]:

Trimethylamine hydrochloride

[OMIM]:

1-Methyl-3-octylimidazolium

S :

Selectivity

RMSD:

Root mean square deviation

NMR:

Nuclear magnetic resonance

x i :

Mole fraction of component i

t:

Thiophene

hc:

Hydrocarbon

E:

Extract

R:

Raffinate

G :

Gibbs energy

R :

Universal gas constant

T :

Temperature, K

M :

Number of tie lines

C :

Number of components in the LLE system

\(x_{{i}}^{p}\) :

Mole fraction of component i in phase p

H i :

Peak area under NMR spectra of species i

Z :

Coordination number

L :

Staverman–Guggenheim combinatorial term parameter

g ji :

Average interaction energy for the interaction of molecules of component j with molecules of component i

A ij :

interaction energy for the interaction of molecules of component j with molecules of component i

L 1 :

Flow rate of extract

L 2 :

Flow rate of raffinate

F :

Feed rate

\(z_{f}^{i}\) :

Feed concentration of component i

γ i :

Activity coefficient of solute i in solution S

β :

Distribution coefficient

θ :

Area fraction in UNIQUAC equation

τ :

NRTL/UNIQUAC interaction parameter

Φ :

Segment fraction in UNIQUAC equation

α :

NRTL non-randomness parameter

θ i :

Composition-weighted volume fraction

ϕ i :

Composition-weighted surface-area fraction

Ψ :

Ratio of extract to feed (L 1/F)

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Authors and Affiliations

  1. Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, 781039, India

    Sai Kiran Cheruku & Tamal Banerjee

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  1. Sai Kiran Cheruku
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  2. Tamal Banerjee
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Correspondence to Tamal Banerjee.

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Cheruku, S.K., Banerjee, T. Liquid–Liquid Equilibrium Data for 1-Ethyl-3-methylimidazolium Acetate–Thiophene–Diesel Compound: Experiments and Correlations. J Solution Chem 41, 898–913 (2012). https://doi.org/10.1007/s10953-012-9840-5

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  • DOI: https://doi.org/10.1007/s10953-012-9840-5

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