Isobaric Vapour–Liquid Equilibrium Data Measurement for a Binary System of Green Solvent 2-Methyltetrahydrofuran and Acetic acid at 101.3 kPa

  • Vyomesh M. Parsana
  • Sachin P. Parikh
Research Article - Chemical Engineering


Green solvents are eco-friendly solvents that can play significant role in the reduction in health hazard and safety issues caused by classical solvents. The use of green solvents can be supported and enhanced by providing the data banks of these solvents, particularly vapour–liquid equilibrium (VLE) data that are required for the design of separation systems. A dynamic VLE still based on the Raal modification of Yerazunis et al. (1964) apparatus was employed in the measurement of isobaric VLE data. The VLE still was maintained at 101.3 kPa pressure. The thermodynamic consistency of the measured VLE data was confirmed by Herington’s area test and Van Ness’s point-to-point test. The correlation of VLE data was established by excess Gibbs energy models NRTL, Wilson and UNIQUAC and the result showed that all three models were in good agreement with the experimental data. The absolute average deviation in temperature was 0.3953 K, 0.3823 K, 0.3977 K and the absolute average deviation in vapour-phase composition was 0.0053, 0.0052, 0.0053 for NRTL, Wilson and UNIQUAC models, respectively. The relative volatility chart of 2-MeTHF/Acetic acid versus 2-MeTHF liquid mole fraction showing \(\pm \,5\%\) deviation of experimental data from Wilson model data was also depicted. The comparison of the experimental VLE data with the data predicted by UNIFAC and modified UNIFAC Dortmund methods was made. The VLE data were generated through binary interaction parameters from Aspen Hysys for Wilson, NRTL and UNIQUAC models and compared with the experimental data.


Green solvents Vapour liquid equilibria Dynamic VLE still 2-Methyltetrahydrofuran Acetic acid 

List of symbols

\({A}_{i}, {B}_{i}, {C}_{i}\)

Antoine equation constants


Energy parameter characteristic of the ij interaction in the NRTL equation


Adjustable interaction parameter in the UNIQUAC equation

\(V_i \)

Molar volume of component i


Liquid-phase mole fraction of component i


Vapour-phase mole fraction of component i


Number of data points

Greek Symbols

\(\alpha _{{ij}}\)

Nonrandomness parameter in the NRTL equation

\(\gamma _{i} \)

Activity coefficient of component i

\(\varLambda _{ij} \)

Two adjustable parameters of the Wilson equation

\(\lambda _{ij} \)

Energies of interaction between molecules i and j in the Wilson equation

\(\phi _i \)

Fugacity coefficient of component i or segment fraction



Cyclopentyl methyl ether






Nonrandom two liquid


Percentage average absolute deviation


Platinum RTD (resistance temperature detector) with a resistance of 100 \(\Omega \) at \(0\,{^{\circ }}\hbox {C}\)


Universal quasi-chemical


Joint Committee for Guides in Metrology



Calculated values


Experimental values

i, j, k

Component identity


Literature values


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This project has been supported financially by Gujarat Council on Science and Technology (GUJCOST), Gandhinagar by awarding minor research project (MRP) grant to this project. The infrastructural support provided by the V.V.P. Engineering College, Rajkot is also highly appreciated.


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Copyright information

© King Fahd University of Petroleum & Minerals 2018

Authors and Affiliations

  1. 1.Department of Chemical EngineeringV.V.P. Engineering College, Gujarat Technological UniversityAhmedabadIndia
  2. 2.Department of Chemical EngineeringL.D. College of Engineering, Gujarat Technological UniversityAhmedabadIndia

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