Methods and catalysts for making biodiesel from the...

C - Chemistry – Metallurgy – 10 – L

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C10L 1/00 (2006.01) C11C 3/00 (2006.01)

Patent

CA 2724970

A method of forming a biodiesel product and a heterogeneous catalyst system used to form said product that has a high tolerance for the presence of water and free fatty acids (FFA) in the oil feedstock is disclosed. This catalyst system may simultaneously catalyze both the esterification of FAA and the transesterification of triglycerides present in the oil feedstock. The catalyst system according to one aspect of the present disclosure represents a class of zinc and lanthanum oxide heterogeneous catalysts that include different ratios of zinc oxide to lanthanum oxides (Zn:La ratio) ranging from about 10:0 to 0:10. The Zn:La ratio in the catalyst is believed to have an effect on the number and reactivity of Lewis acid and base sites, as well as the transesterification of glycehdes, the esterification of fatty acids, and the hydrolysis of glycehdes and biodiesel.

L'invention porte sur un procédé de formation d'un produit biodiesel et sur un système catalyseur hétérogène utilisé pour former ledit produit, qui a une grande tolérance à la présence d'eau et d'acides gras libres (FFA) dans l'huile de charge. Le système catalyseur peut simultanément catalyser tant l'estérification des FFA que la transestérification des triglycérides présents dans l'huile de charge. Le système catalyseur selon un aspect de la présente invention représente une classe de catalyseurs hétérogènes à l'oxyde de zinc et de lanthane, qui présentent différents rapports de l'oxyde de zinc aux oxydes de lanthane (rapport Zn:La), compris entre environ 10:0 et 0:10. On pense que le rapport Zn:La du catalyseur a un effet sur le nombre et la réactivité des sites d'acides et de bases de Lewis, ainsi que sur la transestérification des glycérides, l'estérification des acides gras et l'hydrolyse des glycérides et du biodiesel.

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