%0 Journal Article
%T Producci¨®n enzim¨˘tica de ¨¦steres et¨Şlicos del aceite de ricino
%A Delgado
%A Claudia
%A Pashova
%A Veselina
%J Revista Facultad de Ingenier¨Şa Universidad de Antioquia
%D 2010
%I Scientific Electronic Library Online
%X biodiesel synthesis through transesterificaci¨®n of castor oil with ethanol using n-hexane as a solvent and a lipozyme tl im commercial lipase as a biocatalyst was studied. the effect of ethanol molar relation to oil (3:1-10:1), temperature of reaction (35-65ˇăc), initial enzymatic charge (5-20% p/p) and amount of water (0-10% p/p) was investigated. the maximum percentage of bio-diesel (ethyl-esters) was obtained at a temperature of 35ˇăc, a 5:1 ethanol to oil molar ratio, an initial enzymatic charge of 15 % p/p and an initial water concentration of 2% p/p, both of them based on the castor oil weight. a simplified model was proposed to describe the enzymatic kinetics of castor oil transesterification with ethanol, based on the ping-pong bi bi mechanism with competitive inhibition for alcohol. the kinetic parameters of the model were estimated graphically and parametrically; a good approach among the results foreseen by the model and experimental data was found at low ethanol concentration (40-80 mol kg-1).
%K castor oil
%K biodiesel
%K transesterification
%K lipase
%K ping- pong bi bi mechanism.
%U http://www.scielo.org.co/scielo.php?script=sci_abstract&pid=S0120-62302010000300001&lng=en&nrm=iso&tlng=en