Patent ID: 6759563
Filing Date: 2004-07-06
Classification: C07C

Abstract:
A process for the isomerization of a feed stream comprising at least C5-C6 hydrocarbons said process comprising:a) separating, in a first fractionation zone, said feed stream comprising at least C5-C6 hydrocarbons into a first stream comprising normal and branched pentanes and lighter boiling hydrocarbons and a second stream comprising normal and branched hexanes; b) contacting at least a portion of the first stream and at least a portion of an isomerization zone effluent with an adsorbent in an adsorption section, selectively adsorbing normal paraffins, and producing a raffinate stream having a decreased concentration of at least one normal paraffin component relative to said portion of the first stream combined with said portion of the isomerization zone effluent, and the adsorbent having normal paraffins adsorbed thereon; c) desorbing the normal paraffins from the adsorbent using the second stream and at least a portion of a second desorbent stream containing normal hexane and monomethylpentane from a second fractionation zone to generate an extract stream containing at least normal pentane, normal hexane, and monomethylpentanes; d) isomerizing at least a portion of the extract stream in an isomerization zone containing an isomerization catalyst at isomerization conditions to form said-isomerization zone effluent comprising at least C5 and C6 isomerized products; and e) separating, in a second fractionation zone, said raffinate stream into an isomerate stream, a heavy hydrocarbon stream, and said stream containing normal hexane and monomethylpentane.