Stabilization of a highly olefinic gasoline

Claim 1

A METHOD OF ELIMINATING GUM-FORMING CONSTITUENTS FROM A HIGHLY OLEFINIC HYDROCARBON FRACTION, WHICH COMPRISES BRINGING HYDROGEN AND A HYDROCARBON FRACTION CONTAINING GUM-FORMING CONSTITUENTS AND A VOLUME OF OLEFINS GREATER THAN THE VOLUME OF PARAFFINS AND NAPHTHENES THEREIN, SAID VOLUME OF OLEFINS BEING MORE THAN 20% BY VOLUME OF SAID HYDROCARBON FRACTION AND IMPARTING TO SAID HYDROCARBON FRACTION A HIGH OCTANE NUMBER INTO CONTACT WITH A SILICEOUS CATALYST CONSISTING ESSENTIALLY OF A MAJOR WEIGHT PROPORTION OF SILICA AND A MINOR WEIGHT PROPORTION ZONE MAINTAINED AT A TEMPERATURE IN THE RANGE OF 750 TO 875* F., THE CONTACT OF SAID HYDROGEN AND SAID HYDROCARBON FRACTION RESULTING IN A NET CONSUMPTION OF HYDROGEN, PASSING SAID HYDROCARBON FRACTION THROUGH THE REACTION ZONE AT A SPACE VELOCITY IN THE RANGE OF ABOUT 0.5 TO 5 LIQUID VOLUMES PER HOUR PER VOLUME OF SAID SILICEOUS CATALYST, MAINTAINING THE PARTIAL PRESSURE OF HYDROGEN IN SAID REACTION ZONE IN THE RANGE OF 50 TO 325 P. S. I., AND RECOVERING FROM THE RESULTING REACTION EFFLUENT A HIGHLY OLEFINIC HYDROCARBON FRACTION WITH A SUBSTANTIALLY DECREASED CONTENT OF GUM-FORMING CONSTITUENTS AND CONTAINING A MAJOR PORTION OF SAID OLEFINS AND HAVING A HIGH OCTANE NUMBER.

Claim 2

A METHOD OF ELIMINATING GUM-FORMING CONSTITUENTS FROM A HIGHLY OLEFINIC HYDROCARBON FRACTION, WHICH COMPRISES BRINGING HYDROGEN AND A HYDROCARBON FRACTION CONTAINING GUM-FORMING CONSTITUENTS AND A VOLUME OF OLEFINS GREATER THAN THE VOLUME OF PARAFFINS AND NAPHTHENES THEREIN, SAID VOLUME OF OLEFINS BEING MORE THAN 20% BY VOLUME OF SAID HYDROCARBON FRACTION AND IMPARTING TO SAID HYDROCARBON FRACTION A HIGH OCTANE NUMBER INTO CONTACT WITH A SILICEOUS CATALYST CONSISTING ESSENTIALLY OF A MAJOR WEIGHT PROPORTION OF SILICA AND A MINOR WEIGHT PROPORTION ZONE MAINTAINED AT A TEMPERATURE IN THE RANGE OF 750 TO 875* F., THE CONTACT OF SAID HYDROGEN AND SAID HYDROCARBON FRACTION RESULTING IN A NET CONSUMPTION OF HYDROGEN, PASSING SAID HYDROCARBON FRACTION THROUGH THE REACTION ZONE AT A SPACE VELOCITY IN THE RANGE OF ABOUT 0.5 TO 5 LIQUID VOLUMES PER HOUR PER VOLUME OF SAID SILICEOUS CATALYST, MAINTAINING THE PARTIAL PRESSURE OF HYDROGEN IN SAID REACTION ZONE IN THE RANGE OF 50 TO 325 P. S. I., AND RECOVERING FROM THE RESULTING REACTION EFFLUENT A HIGHLY OLEFINIC HYDROCARBON FRACTION WITH A SUBSTANTIALLY DECREASED CONTENT OF GUM-FORMING CONSTITUENTS AND CONTAINING A MAJOR PORTION OF SAID OLEFINS AND HAVING A HIGH OCTANE NUMBER.