Patent ID: 6169219
Filing Date: 2001-01-02
Classification: C07C

Abstract:
A process for producing an alkylaromatic comprising: a) passing a first feed stream comprising a feed olefin and a second feed stream comprising a feed aromatic to a first alkylation zone, reacting the feed olefin and the feed aromatic to form an alkylaromatic in the first alkylation zone in the presence of a first alkylation catalyst at first alkylation conditions, the first alkylation conditions comprising a first temperature, and withdrawing from the first alkylation zone an effluent stream comprising the alkylaromatic and a polymeric byproduct, wherein the effluent has an effluent linearity, and an effluent concentration of the polymeric byproduct; b) contacting at least a portion of the effluent stream comprising the alkylaromatic and the polymeric byproduct in a second alkylation zone with a second alkylation catalyst at second alkylation conditions, wherein the second alkylation conditions comprise a second temperature that is greater than the first temperature, producing a heavy alkylate in the second alkylation zone, and withdrawing from the second alkylation zone a polymer-depleted stream comprising the alkylaromatic and the heavy alkylate, wherein the polymer-depleted stream has a polymer-depleted linearity that is not greater than the effluent linearity, and a polymer-depleted concentration of the polymeric byproduct that is less than the effluent concentration; c) separating the polymer-depleted stream into a heavy alkylate stream enriched in the heavy alkylate and a product stream depleted in the heavy alkylate and containing a substantial portion of the alkylarornatic; and d) recovering the product stream from the process.