Naphtha aromatization process

C - Chemistry – Metallurgy – 10 – G

Patent

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C10G 35/095 (2006.01)

Patent

CA 2281563

A process for reforming naphtha-containing hydrocarbon feedstreams is disclosed wherein a naphtha stream containing at least about 25 wt.% of C5 to C9 aliphatic and cycloaliphatic hydrocarbons is contacted with a modified reforming catalyst, e.g. ZSM-5 containing a dehydrogenation metal, selected from the group of gallium, zinc, indium, iron, tin and boron, which has been modified by contact with group IIA alkaline earth metal, e.g., barium, or with an organosilicon compound in an amount sufficient to neutralize at least a portion of the surface acidic sites present on the catalyst. The resulting reformate contains a reduced content of C1 to C4 gas and a C8 aromatic fraction having an enhanced content of para-xylene.

La présente invention concerne un procédé de réformage de courants d'alimentation en hydrocarbures contenant du naphte. Ce procédé consiste à mettre en contact un courant de naphte contenant pour environ 25 % de sa masse des hydrocarbures aliphatiques et cycloaliphatiques en C¿5?-C¿9?, soit avec un catalyseur de reformage tel que le ZSM-5 contenant un métal de déshydrogénation, appartenant au groupe des gallium, zinc, indium, fer, étain et bore, et qui a été modifié par contact avec un métal alcalino-terreux du groupe IIA tel que le barium, soit avec composé organosilicé, et ce, en quantité suffisante pour neutraliser au moins une partie des sites superficiels acides du catalyseur. Le réformat résultant présente une teneur réduite en gaz en C¿1?-C¿4? pour une teneur accrue en para-xylène de la fraction aromatique en C¿8?.

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