Patent ID: 8153854

Claim:
A process for producing an alkylate having a low Reid vapor pressure, the process comprising: contacting a C 6+ -containing hydrocarbon stream, wherein the C 6+ -containing hydrocarbon stream comprises at least one of oligomers of C 3 to C 5 olefins and a first dilute alkylate produced by contacting an isoparaffin with at least one of C 3 to C 5 olefins and oligomers of C 3 to C 5 olefins, with a mixture of isopentane and isobutane in the presence of an acid catalyst in an alkylation reactor to form a second dilute alkylate product; fractionating the second dilute alkylate product to form an isobutane-rich fraction, a n-butane-rich fraction, a fraction comprising isopentane, and an alkylate product having a Reid vapor pressure less than 0.35 bar (5 psi); recycling at least a portion of the fraction comprising isopentane to the alkylation reactor.