Abstract

MARCANO, Laura et al. Study of the biodiesel obtention from secondary products of the transesterification reaction of waste cooking oils. Rev. Fac. Ing. UCV [online]. 2014, vol.29, n.1, pp.65-74. ISSN 0798-4065.

In the present experimental study it was obtained soap as subproduct of the transesterification reaction with basic catalysis of waste cooking oils, in order to evaluate the feasibility to produce biodiesel from this waste through acid catalysis. A factorial design 2² with 5 central points was used, and the selected variables for the study were: reaction time (6-10 hours) and acid concentration (5-15 %w/w of H₂SO₄) with respect to the sub-product quantity employed as raw material. The yield of reaction, density, acid number and calorific power were measured. The acid concentration was a determinant factor in the reaction yield while the influence of time was negligible. The best values obtained for density and calorific power of the produced biodiesel were 881 kg/m³ and 39.17 MJ/kg, respectively, which are according to the norms UNE-EN 14214 and EN-590. Even though the feasibility of the process was verified, the yields obtained were low (20.8-43.7 %) thus affecting its profitability.

Keywords : Biodiesel; Waste cooking oil; Soap; Transesterification reaction; Saponification reaction.

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