Estimating the absorption of volatile organic compounds in four biodiesels using the UNIFAC procedure

Corina M. Mateescu, Edison Muzenda, Mohamed Belaid, Saka Abdulkareem, Ayo S. Afolabi

Research output: Contribution to journalArticlepeer-review


This work considered the thermodynamic feasibility of scrubbing volatile organic compounds into biodiesel in view of designing a gas treatment process with this absorbent. A detailed vapour - liquid equilibrium investigation was performed using the original UNIFAC group contribution method. The four biodiesels studied in this work are methyl oleate, methyl palmitate, methyl linolenate and ethyl stearate. The original UNIFAC procedure was used to estimate the infinite dilution activity coefficients of 13 selected volatile organic compounds in the biodiesels. The calculations were done at the VOC mole fraction of 9.213×10-8. Ethyl stearate gave the most favourable phase equilibrium. A close agreement was found between the infinite dilution activity coefficient of toluene found in this work and those reported in literature. Thermodynamic models can efficiently be used to calculate vast amount of phase equilibrium behaviour using limited number of experimental data.

Original languageEnglish
Pages (from-to)756-761
Number of pages6
JournalWorld Academy of Science, Engineering and Technology
Publication statusPublished - Feb 2011


  • Biodiesel
  • Equilibrium
  • Gas treatment
  • Infinite dilution
  • Thermodynamic

ASJC Scopus subject areas

  • General Engineering


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