Patent ID: 8187456
Filing Date: 2012-05-29
Classification: B01D,C01B,C10G

Abstract:
1. A process for hydrocracking a hydrocarbon feed, comprising: a) contacting a hydrocarbon feed in a hydrocracking zone with a hydrogen-containing gas and a catalytically effective amount of a hydrocracking catalyst under hydrocracking conditions thereby resulting in a lower boiling hydrocarbon liquid phase and a vapor phase containing hydrogen and light hydrocarbons; b) separating the lower boiling hydrocarbon liquid phase and the vapor phase; c) removing at least a portion of the light hydrocarbons from at least a portion of the vapor phase, thereby increasing its hydrogen concentration, in a rapid cycle pressure swing adsorption unit containing a plurality of adsorbent beds and having a total cycle time of less than about 30 seconds and a pressure drop within each adsorbent bed of greater than about 5 inches of water per foot of bed length; and d) recycling at least a portion of the vapor phase of step c) above having an increased concentration of hydrogen to the hydrocracking zone; wherein the removing step c) results in a recovery of a purified hydrogen-containing gas stream, relative to said hydrogen-containing make-up treat gas, said vapor phase product, or both, so as to exhibit (i) a rate of recovery (R%) greater than 80% for a product purity to feed ratio (P%/F%) greater than 1.1, (ii) a rate of recovery (R%) greater than 90% for a product purity to feed ratio (P%/F%) less than 1.1 but greater than 0, or (iii) both (i) and (ii).