5-11: Enzymatic transesterification of waste oils

Tuesday, May 1, 2012
Napoleon Ballroom C-D, 3rd fl (Sheraton New Orleans)
Laura Marina Pinotti1, Lorena Coelho Benevides1, Gabriela Soares Borges Salomão1, Jairo Pinto de Oliveira2 and Sérvio Túlio Alves Cassini2, (1)Departamento de Engenharias e Computação, Universidade Federal do Espírito Santo, São Mateus, Brazil, (2)Departamento de Engenharia Ambiental, Universidade Federal do Espírito Santo, Vitória, Brazil
Most of all energy consumed worldwide comes from oil, coal and natural gas, but these sources are limited and estimated to be exhausted in the near future. In this context, biodiesel appears as a promising energy source because it is a renewable and biodegradable fuel, being focus of many researches. The aim of this study is to investigate the generation of biofuels by enzymatic transesterification from oil residues (cooking oil and industrial food grease trap). Thus, it is intended to take the waste to reduce the cost of biofuel as well as to mitigate possible negative impacts to the environment. The variables studied were enzymes from different sources (Candida antarctica, Mucor miehei and Thermomyces lanuginosa) at temperatures of 30, 40, 50 and 60 ° C. Transesterification were carried out for 24 hours and the initial reaction mixture consisted of oil:ethanol molar ratio 1:6 and enzyme concentration of 5% (w/w). The best yields were achieved using the enzyme Candida antarctica at 40 ° C for fat (95.7%) and the residual oil (43,1%). The enzyme from Thermomyces lanuginosa reached the lowest yields.

INDEX ENTRIES: lipolytic enzymes, biodiesel, residual oils.

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