Reaction zone effluents separation and hydrogen enrichment process

Claim 1

IN A LHYDROCARBON CONVERSION PROCESS WHEREIN (1) A HYCROCARBON CHANGE STOCK AND HYDROGEN ARE CONTACTED IN A CATALYTIC REACTION ZONE, (2) A HYDROGEN-CONTAINING HYDROCARBON EFFLUENT STREAM IS WITHDRAWN FROM SAID ZONE, (3) SAID EFFLUENT IS SEPARATED TO PROVIDE A PRINCIPALLY LIQUID PHASE AND A PRINCIPALLY VAPOROUS PHASE, AND (4) AT LEAST A PORTION OF SAID VAPOROUS PHASE IS RECYCLED TO SAID REACTION ZONE, THE IMPROVEMENT COMPRISING SEPARATEING SAID EFFLUENT AND INCREASING THE HYDROFEN CONCENTRATION OF SAID RECYCLED VAPOROUS PHASE BY THE STEPS OF: A. PARTICALLY CONDENSING SAID HYDROCARBON REACTION ZONE EFFLUENT AT A TEMPERATURE FROM ABOUT 150*F TO ABOUT 300*F AND INTRODUCING THE SAME INTO A VAPOR-LIQUID SEPARATION ZONE, THEREIN EFFECTING SEPARATION INTO A FIRST HYDROGEN-CONTAINING VAPOUOUS PHASE AND A FIRST LIQUID PHASE; B. INTRODUCING SAID FIRST VAPOROUS PHASE UPWARDLY INTO A CONTACTING-CONDENSING ZONE AND THEREIN COUNTERCURRENTLY CONTACTING THE SAME WITH A DOWNWARDLY FLOWING, COOLED FRACTIONATION BOTTOMS MATERIAL, AT CONTACTING CONDITIONS SELECTED TO EFFECT CONDENSATION AND SELECTIVE ABSORPTION OF A PORTION OF SAID FIRST VAPOROUS PHASE; C. RECOVERING, FROM SAID CONTACTING-CONDENSING ZONE, A SECOND VAPOROUS PHASE ENRICHED IN HYDROGEN AND A SECOND LIQUID PHASE OF SAID LIQUID BOTTOMS MATERIALS AND THE CONDENSED-ABSORBED PORTION OF SAID FIRST VAPOROUS PHASE; D. RECYCLING AT LEAST A PORTION OF SAID SECOND VARPOROUS PHASE TO COMBINE WITH SAID HYDROCARBON CHARGE STOCK; E. FRACTIONATING A MIXTURE OF SAID FIRST AND SECOND LIQUID PHASES, IN A FRACTIONATION ZONE, AT CONDITIONS SELECTED TO VAPORIZE LIGHT COMPONENTS THEREFROM, AND RECOVERING THE SAME AS A THIRD VAPOROUS PHASE; F. RECOVERING A LIQUID BOTTOMS MATERIAL FROM SAID FRACTIONATION ZONE; AND, G. COOLING SAID LIQUID BOTTOMS MATERIAL AND PASSING AT LEAST A PORTION OF THE COOLED MATERIAL DOWNWARDYL INTO SAID CONTACTING-CONDENSING ZONE TO COUNTERCURRENTLY CONTACT SAID FIRST VAPOROUS PHASE THEREIN.