Process for producing hydrocarbon fractions from mixtures of...

C - Chemistry – Metallurgy – 10 – G

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C10G 3/00 (2006.01) C10G 45/60 (2006.01) C10G 45/62 (2006.01)

Patent

CA 2669538

A process is described for producing hydrocarbon fractions which can be used as diesel fuel or as components of diesel fuel, starting from a mixture of a biological origin containing esters of fatty acids possibly with amounts of free fatty acids, which comprises the following steps: 1) hydrodeoxygenation of the mixture of a biological origin; 2) hydroisomerization of the mixture resulting from step (1), after possible purification treatment, said hydroisomerization being effected in the presence of a catalytic system which comprises: a) a carrier of acid nature comprising a completely amorphous micro-mesoporous silico-alumina having a SiO2/A12O3 molar ratio ranging from 30 to 500, a surface area greater than 500 m2/g, a pore volume ranging from 0.3 to 1.3 ml/g, an average pore diameter lower than 40 Ä, b) a metallic component containing one or more metals of group VIII, possibly mixed with one or more metals of group VIB.

L'invention concerne un procédé de production de fractions hydrocarbonées qui peuvent être utilisées en tant que carburant diesel ou en tant que composants de carburant diesel. Ledit procédé de production part d'un mélange d'origine biologique contenant des esters d'acides gras éventuellement avec des quantités d'acide gras libres et comprend les étapes suivantes : 1) l'hydrodésoxygénation du mélange d'origine biologique; 2) l'hydroisomérisation du mélange résultant de l'étape (1), après un éventuel traitement de purification, ladite hydroisomérisation étant effectuée en présence d'un système catalytique qui comporte a) un support de nature acide comportant une silico-alumine micro-mésoporeuse complètement amorphe ayant un rapport molaire SiO2/Al2O3 se situant dans une plage de 30 à 500, une surface active supérieure à 500 m2/g, un volume de pore se situant dans une plage de 0,3 à 1,3 ml/g, un diamètre moyen de pore inférieur à 40 Ä, b) un composant métallique contenant un ou plusieurs métaux du groupe VIII, éventuellement mélangés à un ou plusieurs métaux du groupe VIB.

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