Desulfurization of petroleum streams using metallic sodium

C - Chemistry – Metallurgy – 10 – G

Patent

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C10G 45/02 (2006.01)

Patent

CA 2679569

In some embodiments, the invention is a method of removing sulfur from a hydrocarbon feed using the steps of dissolving metallic sodium in a first solvent, combining the sodium/first solvent solution with a sulfur-free alkane or cycloalkane second solvent, vaporizing the first solvent from sodium/first solvent/second solvent combination to transfer the dissolved metallic sodium into the second solvent, and then combine the resultant liquid with a liquid hydrocarbon feed containing an organosulfur species. The resulting stream is combined with a hydrogen donor. The combination is heated and pressurized to form a liquid hydrocarbon product containing sodium sulfide. The liquid hydrocarbon product containing sodium sulfide is then cooled, and the sodium sulfide is extracted. The extracted sodium sulfide is then processed in a sodium sulfur cell to regenerate the sodium and recycle it to the feed.

L'invention concerne, selon certains modes de réalisation, un procédé d'élimination du soufre dans un courant d'hydrocarbures utilisant les étapes consistant à : dissoudre du sodium métallique dans un premier solvant, mélanger la solution sodium/premier solvant avec un second solvant alcane ou cycloalcane sans soufre, vaporiser le premier solvant du mélange sodium/premier solvant/second solvant pour transférer le sodium métallique dissous dans le second solvant, puis mélanger le liquide résultant avec une alimentation liquide d'hydrocarbures contenant une espèce d'organosoufre. Le courant résultant est mélangé avec un donneur d'hydrogène. Le mélange est chauffé et mis sous pression pour former un produit liquide d'hydrocarbures qui contient du sulfure de sodium. Le produit liquide d'hydrocarbures contenant du sulfure de sodium est ensuite refroidi et le sulfure de sodium est extrait. Le sulfure de sodium extrait est ensuite traité dans une cellule sodium-soufre pour régénérer le sodium et le recycler dans l'alimentation.

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