Adsorptive Separation process for the separation of paraisomero a load of hydrocarbons comprising a mixture of bialquilsustituidos monocyclic Aromatic isomers

摘要

An adsorptive separation process for separating para-isomers from a hydrocarbon feed containing a mixture of aromatic isomers, including the para-isomer, which process employs a crystalline aluminosilicate adsorbent containing an alcohol substrate to selectively adsorb the para-isomer from the feed. The alcohol substrate substantially increases the selectivity of the adsorbent for the para-isomer with respect to the other aromatic isomers, thereby improving the efficiency of the separation process. In one specific embodiment the use of an alcohol substrate increases the selectivity of the adsorbent for para-xylene sufficiently to permit the use of a benzene-containing desorbent to remove the adsorbed para-xylene. Because of its lower boiling point, a benzene-containing desorbent avoids fractionation difficulties that may result when a toluene desorbent is used while processing a non-extracted C8 aromatic feed stock.