Production of biodiesel from microalgae oil (Chlorella protothecoides) by non-catalytic transesterification: Evaluation of reaction kinetic models and phase behavior

Jiuxu Liu, Ronghong Lin, Yue Nan, Lawrence L. Tavlarides

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

The non-catalytic transesterification of microalgae oil with methanol was conducted at 300-400°C, 150-300 bar, methanol-to-oil molar ratio (MOMR) of 6-12, and residence time of 0.5-10 min. A visualization system was built to study the phase transition, and it shows that at the conditions (T: 300-400°C, P: 200 bar, τ: 0.5-10 min, MOMR of 9), the reactions were performed in homogeneous state. The dynamic phase behavior of the reacting systems was also investigated by RK-Aspen Equation of State. The results indicate that at 200 bar, MOMR of 9, and 300-385°C, the reacting mixtures were in liquid state and moved toward supercritical region, while at 400°C the reacting system was initially in liquid state and quickly approached supercritical state due to the fast reaction conversion. The critical points of the reaction mixtures were estimated. Ten commonly used kinetic models were evaluated, and it shows that three-step, reversible second-order model worked best in the data fitting. Reaction rate constants and activation energies for selected models were determined and compared with literature data.

Original languageEnglish (US)
Pages (from-to)38-50
Number of pages13
JournalJournal of Supercritical Fluids
Volume99
DOIs
StatePublished - Apr 2015

Keywords

  • Biodiesel
  • Microalgae oil
  • Non-catalytic transesterification
  • Phase behavior
  • Reaction kinetic models evaluation

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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