Catalytic dehydrogenation in transfer line reactor

Claim 1

AN IMPROVED PROCESS FOR DEHYDROGENATING A HYDROCARBON STREAM INTO MORE UNSATURATED COMPOUNDS WHICH COMPRISES SUSPENDING A PREHEATED DEHYDROGENATION CATALYST IN A VAPOR STREAM OF SAID HYDROCARBON IN A DEHYDROGENATION ZONE, PASSING THE SUSPENDED CATALYST UNIFORMLY AND SUBSTANTIALLY AT THE SAME VELOCITY AS THE REACTANT VAPOR UPWARDLY THROUGH SAID REACTION ZONE FOR A CONTACT PERIOD OF LESS THAN ONE SECOND, PASSING A MORE READILY DEHYDROGENATABLE HYDROCARBON INTO SAID ZONE DOWNSTREAM FROM SAID FIRST HYDROCARBON INJECTION POINT THEREBY RAPIDLY QUENCHING THE REACTION MIXTURE AND MINIMIZING THE DEGRADATION OF PRODUCT, DEHYDROGENATING SAID SECOND HYDROCARBON IN SAID ZONE AT A LOWER TEMPERATURE THAN SAID INITIALLY INJECTED HYDROCARBON, DISCHARGING RESULTING VAPOROUS PRODUCTS AND SUSPENDED CATALYST FROM THE UPPER END PORTION OF SAID REACTION ZONE INTO A SEPARATION ZONE, IMMEDIATELY QUENCHING SAID VAPOR PRODUCTS, CONTINUOUSLY WITHDRAWING SPENT CATALYST FROM SAID SYSTEM, AND WITHDRAWING DEHYDROGENATED HYDROCARBONS FROM SAID SYSTEM.