The Kinetics of Calcium Oxide Catalyzed Esterification of Glycerol with Free Fatty Acids Using Pseudo-homogeneous Model Approach

DOI: https://doi.org/10.14710/reaktor.18.1.1-6
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Article Info
Submitted: 07-09-2017
Published: 28-05-2018
Section: Research Article
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Abstract

 

This research aims to study the reaction kinetics of esterification reaction of glycerol with free fatty acid (FFA) using calcium oxide catalyst to produce mono-diacylglycerol (MDAG) using pseudo-homogeneous approach. The effects of time and temperature on the reaction conversion were investigated simultaneously. The FFA used was from the waste of cocoa production process, while the solid catalyst used was calcium oxide from eggshell ash. The results show that the cocoa based FFA was composed of palmitic acid (49.24%), methyl stearate (1.05%), oleic acid (25.39%), and stearic acid (24.32%). The calcium oxide content in the eggshell ash was 60% w/w. At all temperatures studied (60, 70, and 80oC), as the reaction time increased, the conversion increased sharply in the first 5 minute followed by a gradual raise to an almost constant value after 20 minutes (0.844; 0.845; and 0.854, respectively). Pseudo-homogeneous second order model can describe the reaction kinetics satisfactorily. The reaction constants (k) at 60, 70, and 80oC were 0.00384, 0.003401, and 0.003518 (L/mole.minute), respectively. The effects of temperature on reaction rate obey the Arrhenius’ equation with collision factor (A) is 0.2659 (L/mole.minute) and activation energy (Ea) is 3544 J/mol.

 

Keywords: calcium oxide; free fatty acid; glycerol; pseudo-homogeneous approach

  1. Megawati Megawati  Scopus
    Department of Chemical Engineering, Faculty of Engineering, Universitas Negeri Semarang Sekaran, Gunungpati, Semarang 50229, Indonesia, Indonesia
  2. Dhoni Hartanto  Orcid Scopus
    Department of Chemical Engineering, Faculty of Engineering, Universitas Negeri Semarang Sekaran, Gunungpati, Semarang 50229, Indonesia
  3. Catur Rini Widyastuti  Scopus
    Department of Chemical Engineering, Faculty of Engineering, Universitas Negeri Semarang Sekaran, Gunungpati, Semarang 50229, Indonesia, Germany
  4. Diyah Saras Wati 
    Department of Chemical Engineering, Faculty of Engineering, Universitas Negeri Semarang Sekaran, Gunungpati, Semarang 50229, Indonesia
  5. Eny Nurhayati 
    Department of Chemical Engineering, Faculty of Engineering, Universitas Negeri Semarang Sekaran, Gunungpati, Semarang 50229, Indonesia