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Kinetics and mechanism of the KOH — catalyzed methanolysis of rapeseed oil for biodiesel production
Author(s) -
Komers Karel,
Skopal František,
Stloukal Radek,
Machek Jaroslav
Publication year - 2002
Publication title -
european journal of lipid science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.614
H-Index - 94
eISSN - 1438-9312
pISSN - 1438-7697
DOI - 10.1002/1438-9312(200211)104:11<728::aid-ejlt728>3.0.co;2-j
Subject(s) - rapeseed , methanol , biodiesel , saponification , chemistry , reaction rate constant , catalysis , thermodynamics , reaction mechanism , biodiesel production , reaction rate , sequence (biology) , organic chemistry , kinetics , physics , food science , quantum mechanics , biochemistry
The reaction of rapeseed oil with methanol catalyzed by KOH is described by a model consisting of two sequences of consecutive competitive reactions. The first sequence expresses the methanolysis of rapeseed oil to methyl esters (biodiesel) whereas the second sequence describes the always present side reaction‐saponification of glycerides and methyl esters by KOH. The proposed chemical model is described (after rational simplifications) by a system of differential kinetic equations which are solved numerically by two independent computing methods. The thus obtained theoretical kinetic and equilibrium results are compared numerically and/or graphically with the experimental parameters. The latter were obtained by the determination of the relevant components in the actual reaction mixture by analytical methods. According to the experimental results, the proposed reaction scheme is fulfilled with the probability of ca. 78%. The optimal average rate constants and equilibrium constants of individual reaction steps of the discussed scheme are introduced. The limitations of the proposed reaction model are discussed.