Improved process for selective hydrogenation of highly...

C - Chemistry – Metallurgy – 10 – G

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C10G 45/04 (2006.01) B01D 3/00 (2006.01) B01J 8/04 (2006.01) C07C 7/163 (2006.01) C07C 7/167 (2006.01) C10G 45/34 (2006.01) C10G 45/60 (2006.01) C10G 65/00 (2006.01) C10G 65/06 (2006.01)

Patent

CA 2224011

A process for treating C3 to C12 petroleum fractions, such as a light cracked naphtha to be used as an etherification feed stock in which H2S is removed by distillation of at least the C3 fraction and mercaptans and diolefins are removed simultaneously in a distillation column reactor (20) using a dual catalyst bed (22, 24). The mercaptans and H2S are reacted with the diolefins in the presence of a reduced nickel catalyst (22) to form sulfides which are higher boiling than the portion of the feed which is fractionated to an upper hydrogenation catalyst bed of palladium (24) for hydrogenating diolefins and acetylenes. The higher boiling sulfides are removed as bottoms (110) along with heavier materials. Any diolefins not converted to sulfides and acetylenes are selectively hydrogenated to mono-olefins in the presence of a palladium oxide catalyst in an upper bed (24), producing overheads (116), substantially free of sulfur compounds, diolefins and acetylenes.

Procédé de traitement de fractions de pétrole C3 à C12, telles qu'une naphte à craquage léger qu'on utilise en tant que charge d'étherification dans laquelle on supprime simultanément H2S par distillation d'au moins la fraction C3, ainsi que les thiols et les dioléfines dans un réacteur de colonne de distillation (20) au moyen d'un double lit catalytique (22, 24). On soumet à une réaction les thiols et H2S avec les dioléfines en présence d'un catalyseur de nickel réduit (22), afin d'obtenir des sulfures, dont le point d'ébullition est plus élevé que celui de la partie de la charge fractionnée en lit catalytique supérieur d'hydrogénation en palladium (24) servant à hydrogéner les dioléfines et les acétylènes. On enlève les sulfures à point d'ébullition supérieur en tant que distillats de fond (110) avec les matériaux plus lourds. Toutes les dioléfines non converties en sulfures et en acétylènes sont hydrogénées sélectivement en mono-oléfines en présence d'un catalyseur d'oxyde de palladium dans un lit supérieur (24), ce qui produit des distillats de tête (116) sensiblement exempts de composés sulfurés, de dioléfines et d'acétylènes.

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