Process for the double bond hydroisomerization of butenes

C - Chemistry – Metallurgy – 07 – C

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C07C 5/25 (2006.01) C07C 6/04 (2006.01)

Patent

CA 2603484

A process is disclosed for the preferential conversion to 2-butene of a stream containing C4 compounds including 1-butene and 2-butene. The process involves mixing the C4 stream with a first hydrogen stream to form a feed stream, hydroisomerizing the feed stream in the presence of a first hydroisomerization catalyst in order to convert at least a portion of the 1-butene to 2-butene, thereby producing a hydroisomerization effluent, passing the hydroisomerization effluent through a fractionation column to form a top stream comprising isobutane and isobutylene and a bottoms stream comprising 2- butene, withdrawing a recycle stream from said fractionation column at a location above the feed point at which the weight ratio of 1-butene to 2- butene is high, and combining the recycle stream with at least one of the C4 stream and the feed stream upstream from the hydroisomerization catalyst. A corresponding apparatus also is disclosed.

L'invention porte sur un procédé qui permet la conversion préférentielle en 2-butène d'un flux contenant des composés C4 comprenant du 1-butène et du 2-butène. Le procédé consiste à mélanger le flux C4 avec un premier flux d'hydrogène afin de former un flux d'alimentation, à hydroisomériser le flux d'alimentation en présence d'un premier catalyseur d'hydroisomérisation afin de convertir au moins une partie du 1-butène en 2-butène, produisant de la sorte un effluent d'hydroisomérisation, à faire passer l'effluent d'hydroisomérisation à travers une colonne de fractionnement afin de former un flux supérieur comprenant de l'isobutane et de l'isobutylène et un flux inférieur comprenant du 2-butène, à extraire un flux de recyclage de ladite colonne de fractionnement en un emplacement situé au-dessus du point d'alimentation où le rapport de poids entre le 1-butène et le 2-butène est élevé, et à combiner le flux de recyclage avec le flux C4 et/ou le flux d'alimentation en amont du catalyseur d'hydroisomérisation. L'invention se rapporte également à un appareil correspondant.

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