Naphtha desulfurization with reduced mercaptan formation

C - Chemistry – Metallurgy – 10 – G

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C10G 45/04 (2006.01) C10G 45/08 (2006.01)

Patent

CA 2392529

Naphtha desulfurization with reduced product mercaptans is achieved by reacting a naphtha feed containing sulfur compounds and olefins with hydrogen in the presence of a hydrodesulfurization catalyst at reaction conditions including a temperature of from 290-425 ~C, a pressure of from 60-150 psig, and a hydrogen gas ratio of from 2000-4000 scf/b. It has been found that desulfurizing within these narrow conditions permits deep desulfurization with reduced mercaptan reversion, to produce a naphtha product with low total sulfur and low mercaptan sulfur levels.

Un procédé de désulfuration de naphta entraînant une production réduite de mercaptans consiste à faire réagir une charge de naphta contenant des composés soufre et des oléfines avec de l'hydrogène en présence d'un catalyseur d'hydrodésulfuration dans des conditions de réaction impliquant une température comprise entre 290 et 425 ·C, une pression comprise entre 60 et 150 psig, et un taux de gaz hydrogène compris entre 2000 et 4000 scf/b. On a découvert que la désulfuration effectuée dans ces conditions limitées permet d'effectuer une désulfuration poussée entraînant une réversion réduite des mercaptans, et de produire un produit naphta présentant une teneur en soufre total faible et une teneur en mercaptans soufre également faible.

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