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The transesterification of rapeseed and waste sunflower oils: Mass-transfer and kinetics in a laboratory batch reactor and in an industrial-scale reactor/separator setup by B. Klofutar; J. Golob; B. Likozar; C. Klofutar; E. Žagar; I. Poljanšek is a Engineering article available to read on EtoBox.

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We have investigated the transesterification of rapeseed (RO) and waste sunflower (SO) oils with methanol in the presence of potassium hydroxide as a catalyst. The transesterification of tri-acylglycerols was first conducted in a batch reactor. The effect of the temperature on the reaction rates was studied at a constant molar ratio of the alcohol to tri-acylglycerols (6:1) and for a constant concentration of the catalyst (1.0 wt%). Size-exclusion chromatography and 1 H NMR spectroscopy were used to quantitatively monitor the transesterification reaction. The mass-transfer coefficients of the tri-acylglycerols during the initial transesterification stage were found to be 0.2-1.2 Â 10 À5 m min À1 , depending on the type of oil and the temperature. Calculated activation energies implied that at higher temperatures the formation of mono-acylglycerols and glycerole was favored for the SO (93 kJ/mol for the forward and 48 kJ/mol for the backward reaction) and the RO (47 kJ/mol for the forward and 36 kJ/mol for the backward reaction), respectively. For the continuous industrial reactor/separator setup, the optimum methanol recycle ratio was established as 0.0550.

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Author

B. Klofutar; J. Golob; B. Likozar; C. Klofutar; E. Žagar; I. Poljanšek

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0960-8524)

Published

2010

Language

EN

Field

Engineering (Physical Sciences)