Patent ID: 7897829
Filing Date: 2011-03-01
Classification: C07C

Abstract:
1. A continuous process for removing aromatic by-products from a feedstock containing aliphatic mono-olefins having from 6 to 22 carbon atoms per molecule and aromatic by-products having from 7 to 22 carbon atoms per molecule comprising: a) selectively removing at least a portion of the aromatic by-products from the feedstock by at least intermittently passing at least a portion of the feedstock to an on-stream zone containing sorbent at conditions effective to selectively sorb aromatic by-products on the sorbent and to produce a sorption effluent stream comprising mono-olefins and having a reduced concentration of aromatic by-products; b) passing a sweep fluid to the off-stream zone containing aliphatic mono-olefins to provide a sweep effluent and sweep fluid is recovered from the sweep effluent; c) regenerating sorbent in an off-stream zone containing sorbent, the sorbent in the off-stream zone having aromatic by-products sorbed thereon from having been on-stream in step a, said regeneration comprising at least intermittently passing a regenerant containing benzene to the off-stream zone to desorb aromatic by-products from the sorbent and produce a regeneration effluent comprising benzene and aromatic by-products, wherein the regeneration effluent includes at least some of the sweep effluent; d) distilling in a regeneration effluent distillation system at least a portion of the regeneration effluent to provide at least one overhead containing benzene and at least one higher-boiling fraction containing desorbed aromatic by-products; e) subjecting at least intermittently at least a portion of the at least one higher-boiling fraction to benzene-forming conditions to convert aromatic by-products to benzene and provide a conversion effluent containing benzene, wherein the benzene-forming conditions are either dealkylation or cracking conditions; and f) distilling in the regeneration effluent distillation system at least a portion of the conversion effluent.