Improved aromatic alkylation process

C - Chemistry – Metallurgy – 07 – C

Patent

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Details

C07C 2/64 (2006.01) C07C 4/18 (2006.01) C07C 7/12 (2006.01) C07C 15/073 (2006.01) C07C 15/085 (2006.01)

Patent

CA 2353978

Alkylation product is contacted with a purification medium in a liquid phase pre-reaction step to remove impurities and form a purified stream. The purified stream is then further processed by liquid phase transalkylation to convert the polyalkylated aromatic compound to a monoalkylated aromatic compound. The process may use a molecular sieve catalyst such as MCM-22 as the purification medium in the pre-reaction step because of its high reactivity for alkylation, strong retention of catalyst poisons and low reactivity for oligomerization under the pre-reactor conditions. Olefins, diolefins, styrene, oxygenated organic compounds, sulfur containing compounds, nitrogen containing compounds and oligomeric compounds are removed.

Dans ce procédé, un produit d'alkylation est mis en contact avec un milieu de purification dans une étape de préréaction en phase liquide pour éliminer les impuretés et former un flux purifié. Ce flux purifié est ensuite traité par transalkylation en phase liquide, en vue de convertir le composé aromatique polyalkylé en un composé aromatique monoalkylé. Ce procédé peut utiliser un catalyseur à tamis moléculaire, tel que MCM-22, comme milieu de purification dans l'étape de préréaction, en raison de sa réactivité élevée pour l'alkylation, de sa forte rétention des poisons du catalyseur et de sa faible réactivité pour l'oligomérisation dans les conditions de préréaction. Les oléfines, les dioléfines, le styrène, les composés organiques oxygénés, les composés contenant du soufre, les composés contenant de l'azote et les composés oligomères sont ainsi éliminés.

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