Method for demetallating refinery feedstreams

C - Chemistry – Metallurgy – 10 – G

Patent

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C10G 32/02 (2006.01)

Patent

CA 2208565

The present invention provides for a method of decreasing the metals content of metal containing petroleum streams by forming a mixture of the petroleum fraction containing those metals and an essentially aqueous electrolysis medium, and passing an electric current through the mixture at a voltage, pH and time sufficient to remove the metals such as Ni, V and Fe from the stream (i.e. to produce a petroleum fraction having decreased content of the metals). The cathodic voltage is from 0 V to -3.0 V vs. SCE at a pH of from 6 to 14, preferably 7 to 14, most preferably above 7 to 14. The invention provides a method for enhancing the value of petroleum feeds that traditionally have limited use in refineries due to their Ni and V content.

L'invention concerne un procédé de réduction de la teneur en métaux de flux de pétrole contenant des métaux qui consiste à mélanger la fraction de pétrole contenant ces métaux avec un milieu électrolytique essentiellement aqueux et à envoyer un courant électrique à travers le mélange avec une tension, un pH et une durée permettant d'effectuer la suppression des métaux, tels que Ni, V et Fe, du flux de pétrole (c'est à dire pour produire une fraction de pétrole dont la teneur en métaux est réduite). La tension cathodique se situe entre 0 V et 3V avec une électrode au calomel saturée (SCE) à un pH de 6 à 14, de préférence, 7 à 14 ou, plus particulièrement, supérieur à 7 jusqu'à 14. L'invention permet de valoriser des charges de pétrole dont l'utilisation est traditionnellement limitée dans les raffineries à cause de leur teneur en Ni et V.

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