Separation of para-xylene by pretreatment using selective hydrogenation and activated clay

摘要

The present invention is directed to a process for the production of a pellet of a pellet by circulating at least a portion of a feed comprising a xylene mixture in a region referred to as an enrichment zone 14 to concentrate the p-xylene in the first fraction 15 and a second fraction 18 of p-And recycling the isomerized product (20) to the concentrated region, separating the p-xylene from the feed containing the xylene mixture to be treated, wherein the second fraction is recycled in the isomerization zone (19) At least a portion selected from the group consisting of the feed to be treated, the isomeric compound and mixtures thereof is circulated in the at least one selective hydrogenation zone (3) and then circulated in the at least one clay treatment zone (8) A step (5) for separating excess hydrogen is carried out in at least one separation zone before or after the clay treatment, and the effluent is withdrawn to the enrichment zone (14) It relates to a method characterized in that transfer.