Removal of sulfur compounds from hydrocarbon feedstreams...

C - Chemistry – Metallurgy – 10 – G

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C10G 29/06 (2006.01) C07C 7/12 (2006.01) C10G 25/00 (2006.01) C10G 29/16 (2006.01)

Patent

CA 2429653

A process for removing sulfur compounds from hydrocarbon feedstreams, particularly those boiling in the naphtha range, by contacting the feedstream with an adsorbent comprised of cobalt and one or more Group VI metals selected from molybdenum and tungsten on a refractory support. This invention also relates to a process wherein a naphtha feedstream is first subjected to selective hydrodesulfurization to remove sulfur but not appreciably saturate olefins. A product stream is produced containing mercaptans that are removed by use of the cobalt-containing adsorbents of the present invention.

L'invention concerne une méthode qui permet d'éliminer des composés sulfurés de débits d'alimentation en hydrocarbures, en particulier des composés qui entrent en ébulltion dans la plage du naphta. Cette méthode consiste à placer le débit d'alimentation au contact d'un adsorbent contenant du cobalt et d'un ou de plusieurs métaux du groupe VI choisis parmi le molybdène ou le tungstène sur un support réfractaire. L'invention concerne également une méthode dans laquelle un débit d'alimentation de naphta est d'abord soumis à une hydrodésulfurisation sélective afin d'en éliminer le soufre mais sans saturer notablement les oléfines. On obtient un débit diluat qui contient des mercaptans, lesquels sont éliminés par l'action des adsorbents à base de cobalt de l'invention.

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