Patent ID: 7838712

Claim:
A method for steam-cracking naphtha comprising passing a feedstock of hydrocarbons through a steam cracker, in the presence of steam; wherein said feedstock of hydrocarbons comprises about 60% to about 80% by weight of a paraffinic naphtha, and about 40% to about 20% by weight of a mixture of a first component, that is, a gasoline produced by a fluidized bed catalytic cracking (FCC) unit and a second component including at least one hydrocarbon refinery gas and at least a feedstock rich in paraffins, the paraffinic naphtha having from 10 to 60% by weight of n-paraffins, from 10 to 60% by weight of isoparaffins, from 0 to 35% by weight of naphthenes, from 0 to 1% by weight of olefins, and from 0 to 20% by weight of aromatics, the FCC gasoline being an unhydrogenated gasoline having from 0 to 30% by weight of n-paraffins, from 10 to 60% by weight of isoparaffins, from 0 to 80% by weight of naphthenes, from 5 to 80% by weight of olefins and from 0 to 60% by weight of aromatics, the refinery gas having from 0 to 5% by weight of hydrogen, from 0 to 40% by weight of methane, from 0 to 50% by weight of ethylene, from 0 to 80% by weight of ethane, from 0 to 50% by weight of propylene, from 0 to 80% by weight of propane and from 0 to 30% by weight of butanes, and the feedstock rich in paraffins containing at least 50% by weight of saturated hydrocarbons, said feedstock containing at least propane or butane.