Production of reformulated gasoline

A process combination for producing a gasoline component from a naphtha feedstock comprising the steps of:

• (a) contacting the naphtha feedstock in a reforming zone at reforming conditions with a reforming catalyst comprising a Group VIII metal on a refractory support to produce a reformate and a hydrogen-rich gas;
• (b) separating the reformate, in a first separation zone, in to a light hydrocarbon product and a heavy reformate;
• (c) separating the heavy reformate, in a second separation zone, into a low-octane paraffin fraction and an aromatic-rich fraction;
• (d) contacting the low-octane paraffin fraction substantially within the range of C.sub.7 to C.sub.10 in a paraffin-isomerization zone at primary isomerization conditions with a paraffin-isomerizing catalyst at a substoichiometric hydrogen ratio which is 90% or less of the stoichiometric ratio to produce an isomerized heavy-paraffin product;
• and,
• (e) combining at least a portion of each of the aromatic-rich fraction and the isomerized heavy-paraffin product to produce the gasoline component.

A process combination for producing a gasoline component from a naphtha feedstock comprising the steps of:

• (a) contacting the naphtha feedstock in a reforming zone at reforming conditions with a reforming catalyst comprising a Group VIII metal on a refractory support to produce a reformate and a hydrogen-rich gas;
• (b) separating the reformate, in a first separation zone, into a normally gaseous fraction, a light naphtha fraction and a heavy reformate;
• (c) contacting the light naphtha fraction in a light-naphtha isomerization zone at secondary isomerization conditions with a light-naphtha isomerization catalyst to produce an isomerized light product.
• (d) separating the heavy reformate, in a paraffin-adsorption zone, into a low-octane paraffin fraction and an aromatic-rich fraction;
• (e) contacting the low-octane paraffin fraction substantially within the range of C.sub.7 to C.sub.10 in a paraffin-isomerization zone at primary isomerization conditions with a paraffin-isomerizing catalyst at a substoichiometric hydrogen ratio which is 90% or less of the stoichiometric ratio to produce an isomerized heavy-paraffin product;
• and,
• (f) combining at least a portion of each of the aromatic-rich fraction, the isomerized light product and the isomerized heavy-paraffin product to produce the gasoline component.