Method for producing 4-vinylcyclohexene, ethyl benzole and...

C - Chemistry – Metallurgy – 07 – C

Patent

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Details

C07C 2/52 (2006.01) C07C 5/367 (2006.01)

Patent

CA 2474762

The invention relates to a method for producing 4-vinylcyclohexene comprising the following steps: (A) a feed gas stream containing n-butane is prepared; (B) said feed gas stream containing n-butane is fed to at least one dehydrogenation zone, where it is dehydrogenated from n-butane to butadiene, whereby a butadiene, n-butane, optionally 1-butene and 2-butene and optionally water vapour and a product stream containing additional minor constituents are obtained; (C) the product stream from the dehydrogenation, optionally after separation of the water vapour and minor constituents, is fed to a dimerization zone, where the butadiene is catalytically dimerized to obtain 4- vinylcyclohexene, n-butane and optionally 1-butene, 2-butene and a product stream containing butadiene that has not been converted; (D) the 4- vinylcyclohexene from the dimerization product stream is separated and the n- butane and optionally 1-butene, 2-butene and the butadiene that has not been converted are returned to the dehydrogenation zone.

L'invention concerne un procédé de production de 4-vinylcyclohexène consistant à (A) préparer un flux gazeux d'alimentation contenant du n-butane, (B) à céder ce flux gazeux d'alimentation contenant du n-butane à au moins une zone déshydrogénation où il est déshydrogéné de n-butane pour donner du butadiène, ce qui permet d'obtenir un butadiène, n-butane, éventuellement 1-butène et 2-butène et éventuellement de la vapeur d'eau et un flux produit contenant des constituants auxiliaires, (C) à céder le flux produit de la déshydrogénation, éventuellement après séparation de la vapeur d'eau et des constituants auxiliaires, à une zone de dimérisation catalytique du butadiène, ce qui permet d'obtenir un 4-vinylcyclohexène, n-butane et éventuellement 1-butène, 2-butène et un flux produit contenant un butadiène qui n'a pas été converti, (D) à séparer le 4-vinylcyclohexène du flux produit de dimérisation et à renvoyer le n-butane et éventuellement le 1-butène, 2-butène et le butadiène non converti dans la zone de déshydrogénation.

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