Enhanced synthesis of isoamyl acetate using liquid-gas biphasic system by the transesterification reaction of isoamyl alcohol obtained from fusel oil

• Published in: Biotechnology and bioprocess engineering 2017, 22(4), , pp.413-422
• Main Authors: Kirdi, Rachida, Ben Akacha, Najla, Messaoudi, Yosra, Gargouri, Mohamed
• Format: Article
• Language: English
• Subjects: Acetic acid; Alcohol; Alcohols; Alginic acid; Batch reactors; Biotechnology; Calcium alginate; Chemical synthesis; Chemistry; Chemistry and Materials Science; Conversion; Ethanol; Extraction; Fluidized bed reactors; Fluidized beds; Fusel oil; Gas-liquid systems; Immobilization; Industrial and Production Engineering; Isoamyl acetate; Isopentyl alcohol; Lipase; Natural gas; Reactors; Research Paper; Transesterification; 생물공학
• ISSN: 1226-8372; 1976-3816
• DOI: 10.1007/s12257-016-0616-4

In this work, the transesterification reaction of isoamyl alcohol obtained from fusel oil and leading to the synthesis of isoamyl acetate was conducted simultaneously with in situ ethanol removal, which allows to shift the reaction equilibrium toward ester synthesis. The extracellular Aspergillus oryzae lipase was immobilized into calcium alginate. Effects of immobilization conditions on the loading efficiency and on the specific activity of entrapped lipase were investigated. The kinetic transfer of volatile reactants from the reactor was investigated using an experimentally first order kinetic model, in order to approve the feasibility of the liquid-gas system with continuous ethanol removal in the ester synthesis. The effects of the most influent parameters affecting the reaction have been also investigated using a Doehlert matrix design. The better operating conditions for isoamyl acetate synthesis were: a temperature of 68.5°C and a respective isoamyl alcohol and A. oryzae lipase concentration of 0.72 M and 2.39 g/L. At these conditions, the resulting reaction conversion and ethanol extraction yields were of 89.55 and 69.60%, respectively. The use of the fluidized bed reactor with continuous ethanol removal has allowed to improve the reaction conversion which was two times than the conversion higher obtained in batch reactor. Furthermore, under the optimized conditions in the fluidized bed reactor, the reaction conversion and the ethanol extraction yields were increased by 44.8 and 36.2%, respectively.