Hydrolysis kinetics of sunflower oil under subcritical water conditions

Abstract A detailed study of the thermal non-catalytic hydrolysis of sunflower oil with subcritical water is illustrated. A number of experimental runs were conducted in a tubular reactor over a range of temperatures (270–350 °C) and reaction times (up to 30 min) at 20 MPa. The influence of temperature on the kinetic parameters was determined by applying the Arrhenius equation to the optimum evaluated rate constants. The energy of activation was found to be highest in the first hydrolysis reaction (triglyceride). The yield of fatty acid was found to increase dramatically with a rise in temperature, which then acts as an acid catalyst into the hydrolysis reactions. A kinetic model is proposed for the thermal hydrolysis of sunflower oil, which elucidates the reaction mechanism at different reaction temperatures and reaction times. The proposed kinetic model fits well with the experimental results with a maximum variance of

[1]  S. Adachi,et al.  Decomposition kinetics of monoacyl glycerol and fatty acid in subcritical water under temperature-programmed heating conditions , 2006 .

[2]  F. Temelli,et al.  Kinetic modeling of hydrolysis of canola oil in supercritical media , 2008 .

[3]  M. Koper,et al.  Bond-breaking electron transfer of diatomic reactants at metal electrodes , 2008 .

[4]  A. Demirbas,et al.  Biodiesel fuels from vegetable oils via catalytic and non-catalytic supercritical alcohol transesterifications and other methods: a survey , 2003 .

[5]  S. Adachi,et al.  Kinetics on the hydrolysis of fatty acid esters in subcritical water , 2004 .

[6]  M. Berrios,et al.  A kinetic study of the esterification of free fatty acids (FFA) in sunflower oil , 2007 .

[7]  Shiro Saka,et al.  Kinetics of hydrolysis and methyl esterification for biodiesel production in two-step supercritical methanol process , 2006 .

[8]  J. King,et al.  Hydrolysis of Vegetable Oils in Sub- and Supercritical Water , 1997 .

[9]  Dadan Kusdiana,et al.  Kinetics of transesterification in rapeseed oil to biodiesel fuel as treated in supercritical methanol , 2001 .

[10]  L. Lascaray.  Mechanism of Fat Splitting , 1949 .

[11]  W. Schmickler.  A theory for nonadiabatic electrochemical electron-transfer reactions involving the breaking of a bond , 2000 .

[12]  Fernando M. Lanças,et al.  Hydrolysis of corn oil using subcritical water , 2006 .

[13]  Tony Clifford,et al.  Fundamentals of Supercritical Fluids , 1999 .

[14]  F. W. Kellaway,et al.  Advanced Engineering Mathematics , 1969, The Mathematical Gazette.

[15]  T. S. Raghunathan,et al.  Thermal hydrolysis of vegetable oils and fats. 1. Reaction kinetics , 1988 .

[16]  R. Santos,et al.  Continuous Flow Hydrolysis of Sunflower Oil for Biodiesel , 2010 .

[17]  Lucio Lascaray,et al.  Industrial fat splitting , 1952 .

[18]  Dadan Kusdiana,et al.  Biodiesel fuel from rapeseed oil as prepared in supercritical methanol , 2001 .

[19]  David Rooney,et al.  Enzymatic catalysis and electrostatic process intensification for processing of natural oils , 2008 .

[20]  Shiro Saka,et al.  Two-step preparation for catalyst-free biodiesel fuel production , 2004, Applied biochemistry and biotechnology.

[21]  Gary R. List,et al.  Hydrolysis of soybean oil. in a subcritical water flow reactor , 1999 .