Solvent‐free enzymatic esterification of free fatty acids with glycerol for biodiesel application: Optimized using the Taguchi experimental method
[1];
[1]
- Center for Advanced Bioenergy and Bioproducts Innovation (CABBI) University of Illinois at Urbana‐Champaign Urbana Illinois USA, Department of Agricultural and Biological Engineering University of Illinois at Urbana‐Champaign Urbana Illinois USA
- USDA, Agricultural Research Service, National Center for Agricultural Utilization Research Bioenergy Research Unit, 1815 N University Peoria Illinois USA
Abstract Presence of free fatty acids along with glycerides poses a technical difficulty for biodiesel production. This work used a Taguchi L9 design to optimize the solvent‐free enzymatic process to result in the esterification of oleic acid with glycerol. Under optimal conditions the esterification reaction temperature of 60°C, enzyme dose of 5 wt%, glycerol: oleic acid molar ratio of 5:1, and reaction time of 3 h, a 75.235 ± 2.19% conversion of oleic acid to esters was achieved. With the addition of molecular sieves, the conversion increased to 86.73% ± 1.09%. However, using the parameters predicted by Taguchi design (60°C, 5 wt%, 5:1, and 4.5 h), 88.5% ± 1.11% of oleic acid could be converted to esters derivative. Diglycerides were the major product, and the reaction equilibrium was attained after 4 h. The immobilized enzyme could be used up to seven times with only a 10% reduction in the conversion. Thus, the process can efficiently reduce the free fatty acid content of oil to make it suitable for biodiesel production.
- Research Organization:
- Univ. of Illinois at Urbana-Champaign, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Biological and Environmental Research (BER)
- Grant/Contract Number:
- DE‐SC0018420; SC0018420
- OSTI ID:
- 1879115
- Alternate ID(s):
- OSTI ID: 1886066; OSTI ID: 1902715
- Journal Information:
- Journal of the American Oil Chemists Society, Journal Name: Journal of the American Oil Chemists Society Vol. 99 Journal Issue: 9; ISSN 0003-021X
- Publisher:
- Wiley Blackwell (John Wiley & Sons)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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