Patent ID: 7341657

Claim:
A process for reducing sulfur and olefin contents in gasoline, comprising: a) contacting gasoline feedstock containing 35-70% by volume of olefins and hydrogen with a hydrorefining catalyst under reaction conditions including a hydrogen/gasoline ratio of 200-600 Nm 3 /m 3, a hydrogen partial pressure of 1.0 to 4.0 MPa, a temperature of 200-380° C. and a liquid hourly space velocity of 3.0-5.0 h −1 ; b) contacting the hydrorefined gasoline and hydrogen with a paraffin-modification catalyst under reaction conditions including a hydrogen/gasoline ratio of 200-1000 Nm 3 /m 3 , a hydrogen partial pressure of 1.0-4.0 MPa, a temperature of 300-460° C. and a liquid hourly space velocity of 0.5-4.0 h −1 to provide an effluent, which is separated to obtain the hydrotreated gasoline fraction, wherein the paraffin-modification catalyst comprises one or more noble or non-noble metals from Group VIII and/or Group VIB, supported over a supporter containing at least a ZSM-5 zeolite; and wherein the effluent from the hydrorefining reaction has a nitrogen content of less than 2 ppm and an olefin content of less than 5% by volume.