Method for reducing conradson carbon content of petroleum...

C - Chemistry – Metallurgy – 10 – G

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C10G 33/02 (2006.01) C10G 32/02 (2006.01)

Patent

CA 2208563

The present invention provides a method for decreasing the Conradson carbon ("Concarbon") number of petroleum feedstreams by passing an electric current through a mixture of a petroleum stream, typically having a Conradson carbon residue of at least about 0.1 % and an aqueous electrolysis medium at a pH and cathodic voltage for a time sufficient to decrease the Conradson carbon number of the petroleum stream. The electrolysis medium contains quaternary carbyl or hydrocarbyl onium salts; inorganic hydroxides such as NaOH or KOH, or mixtures thereof. A cathodic voltage of 0 V to -3.0 V vs. Saturated Calomel Electrode (SCE) and a pH of 6-14, preferably 7 to 14, more preferably above 7 to 14 are used. The invention has utility for converting less economically desirable refinery feeds to feeds that are more valuable.

L'invention concerne un procédé servant à diminuer le nombre de carbone Conradson ("Concarbon") de flux de pétrole et consistant à faire passer un courant électrique à travers un mélange composé d'un flux de pétrole, dont le résidu Conradson est d'au moins 0,1 %, et d'un milieu électrolytique aqueux à un pH, à une tension cathodique et pendant une durée suffisants pour faire baisser le nombre de carbone Conradson du flux de pétrole. Le milieu électrolytique contient des sels onium quaternaires de carbyle ou d'hydrocarbyle, des hydroxydes inorganiques, tels que NaOH ou KOH, ou leurs mélanges. On utilise une tension cathodique de 0 à 3 volts avec une électrode au calomel saturée (SCE) et un pH de 6 à 14, de préférence 7 à 14 ou, plus particulièrement, supérieur à 7 et inférieur ou égal à 14. L'invention permet de convertir des charges de raffinerie présentant un moindre intérêt économique en charges d'une valeur plus importante.

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