Patent ID: 6740787
Filing Date: 2004-05-25
Classification: C10G

Abstract:
Process for treatment of a feedstock that comprises hydrocarbons with at least four carbon atoms per molecule, whereby said feedstock comprises diene compounds and primarily butadiene as well as acetylene compounds in a minor proportion, whereby said process comprises a distillation stage of the feedstock introduced in a distillation zone that comprises a rectification zone and a drainage zone and at least one stage for hydrogenation of acetylene compounds in at least one hydrogenation zone with at least one catalytic bed under suitable hydrogenation conditions in the presence of a gas that contains hydrogen, wherein a portion of the feedstock that circulates in the distillation zone that is enriched with acetylene compounds is drawn off laterally in liquid phase at a draw-off level in the distillation zone and passed to a hydrogenation zone outside the distillation zone; a hydrogenation effluent that is low in acetylene compounds and enriched in oligomers is produced in said hydrogenation zone; and said hydrogenation effluent from said hydrogenation zone is recycled to a level in the rectification zone above the draw-off level, said draw-off level and recycle level being in communication with the same hydrogenation zone so as to create an internal reflux in the distillation column, whereby the process is characterized in that a C4 fraction that comprises essentially all of the butadiene and that is low in acetylene compounds is recovered at the top of the distillation zone, and an oligomer-enriched C5 fraction is recovered at the bottom of the distillation zone.