Process for producing alkylaromatic compounds

C - Chemistry – Metallurgy – 07 – C

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Details

C07C 2/66 (2006.01) C07C 6/12 (2006.01) C07C 15/073 (2006.01) C07C 15/085 (2006.01)

Patent

CA 2740021

In a process for alkylation of an alkylatable aromatic compound to produce a monoalkylated aromatic compound, a first feed stream comprising fresh alkylatable aromatic compound is passed to a first reaction zone which comprises a transalkylation catalyst and which also receives a second feed stream comprising polyalkylated aromatic compounds. The first and second feed streams are contacted with the transalkylation catalyst in the first reaction zone under conditions to transalkylate the polyalkylated aromatic compounds with the alkylatable aromatic compound to produce the desired monoalkylated aromatic compound. A first effluent stream comprising unreacted alkylatable aromatic compound and the monoalkylated aromatic compound is removed from the first reaction zone and passed to a fractionation system to separate the first effluent stream into a first light fraction comprising the unreacted alkylatable aromatic compound and a first heavy fraction comprising the monoalkylated aromatic compound. At least part of one or more impurities in the fresh feed stream are removed in the first reaction zone.

La présente invention concerne un procédé d'alkylation d'un composé aromatique alkylable donnant un composé aromatique monoalkylé. Un premier flux d'alimentation comprenant un composé aromatique alkylable frais est amené jusqu'à une première zone réactionnelle comprenant un catalyseur de transalkylation et recevant également un second flux d'alimentation comprenant des composés aromatiques polyalkylés. Les premier et second flux d'alimentation, ainsi que le catalyseur de transalkylation, sont mis en contact, dans la première zone réactionnelle, avec le composé aromatique alkylable, dans des conditions permettant la transalkylation des composés aromatiques polyalkylés, ce qui donne le composé aromatique monoalkylé recherché. Un premier flux d'effluents comprenant du composé aromatique alkylable n'ayant pas réagi et le composé aromatique monoalkylé est retiré de la première zone réactionnelle et envoyé vers un système de fractionnement afin de séparer le premier flux d'effluents en une première fraction légère comprenant le composé aromatique alkylable n'ayant pas réagi et en une première fraction lourde comprenant le composé aromatique monoalkylé. Au moins une partie d'une ou plusieurs impuretés présentes dans le flux d'alimentation frais est éliminée au niveau de la première zone réactionnelle.

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