Biodiesel purification developments based on carbon dioxide supercritical for biofuel-technology

Abstract

The objective of this paper is to study on purification biodiesel ethanol / octane mixture by using carbon dioxide solvent at elevated pressures in order to have an assessment of the feasibility studies of the sustainable development of agriculture vegetable plants and to produce biodiesel transportation fuel for the bio fuel-technology industry. The results of this assessment would be based on the mixture components concentrations defined by phase-equilibria mutual solubility data for ethanol / octane mixture. Therefore, solubility data were measured for carbon dioxide with ethanol and octane using a phase equilibrium loading re-circulating high-pressure type apparatus at pressure up to 100.75 bars and temperature 348.15 K for the ethanol / octane mixture involved with 25% ethanol and 75% octane. Experiment data would be compared with data calculated from the regular solution theory. A procedure is employed to each phase by applying activity coefficient expressions based on the regular solution theory's type. Calculations along these lines are described and the physical basis for the application using this method under the relevant condition is discussed. The regular solution approach is encouraging through the interaction parameters for the calculation of activity coefficients must be regarded as pressure dependent. Therefore, the past assessment of the feasibility studies focused efforts on the production of hydrogen, however, shifted primary research, to studying oil production focused on the production of transportation biodiesel fuels from vegetable plant. The model approach, in particular, is that the yield of the predicted mixture concentration of the transportation fuels, must be regarded as pressure dependent and that would be independent of temperature.