Process for dimerizing olefinic hydrocarbon feedstock and...

C - Chemistry – Metallurgy – 07 – C

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C07C 2/06 (2006.01) C10L 1/16 (2006.01) C07C 9/21 (2006.01)

Patent

CA 2346902

The invention relates to process for dimerizing olefinic hydrocarbon feedstock, to hydrocarbon compositions and to fuel components produced by the process. According to the invention, fresh olefinic hydrocarbon feedstock is fed to a reaction zone of a system including at least one reaction zone and at least one distillation zone. The olefinic hydrocarbon feedstock is contacted with an acidic catalyst in the presence of an oxygenate at conditions in which at least a part of the olefins dimerizes. The effluent from the reaction zone is conducted to the distillation zone where dimerized reaction product is separated from effluent, and at least one flow comprising oxygenate is withdrawn from the side of at least one distillation column. The flow is circulated from distillation zone back to dimerization. The reaction mixture is recovered and optionally hydrogenated to form a parafinic reaction product.

L'invention concerne un procédé relatif à la dimérisation d'une charge d'hydrocarbures oléfiniques, qui permet d'élaborer des compositions d'hydrocarbures et des compositions combustibles. La charge fraîche d'hydrocarbures oléfiniques est injectée dans une zone de réaction de système comprenant au moins une zone de réaction et au moins une zone de distillation. La charge est mise en contact avec un catalyseur acide en présence d'un composé oxygéné, dans des conditions propices à la dimérisation d'au moins une partie des oléfines. L'effluent de la zone de réaction est conduit vers la zone de distillation, où le produit de la réaction de dimérisation est séparé de l'effluent, et au moins un flux comprenant le composé oxygéné est retiré du côté d'au moins une colonne de distillation. Le flux est renvoyé en dimérisation depuis la zone de distillation. Le mélange issu de la réaction est récupéré et éventuellement hydrogéné de manière à former un produit de réaction paraffinique.

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