HEGEL Pablo Ezequiel
congresos y reuniones científicas
Density and conversion in Biodiesel Production with Supercritical methanol
A. VELEZ; P. HEGEL; G. MABE; E. BRIGNOLE
Conferencia; Ninth Conference on Supercritical Fluids and Their Applications; 2010
The densities of vegetable oils + methanol reacting mixtures were measured by loading a closed vessel with a known amount of an oil/alcohol mixture of a given molar ratio. For each studied condition the mixture was brought to a temperature at which the system became homogeneous. The isochoric (constant volume) relation between temperature and pressure at this particular density and composition was recorded. In the temperature range of 550 ? 630 K, a high conversion of the oil to the corresponding fatty esters and glycerin was obtained. The densities of sunflower oil with methanol for two different alcohol/oil ratios: 40 and 25 were measured. Densities of coconut oil + methanol and methyl oleate + methanol mixtures were also measured. The effect of global density on conversion was studied at long reaction times (3-4 hrs). Strong evidence of the phase transitions of the reacting mixtures, from heterogeneous to homogeneous, was obtained from the experimental results.