Patent ID: 8299311

Claim:
A process for reacting an iso-pentane with an olefinic feedstock comprising one or more iso-olefins, one or more alpha-olefins, or a mixture thereof, comprising: a. partially converting one or more olefins in the olefinic feedstock with an ionic liquid catalyst comprising an alkyl substituted pyridinium chloroaluminate, an alkyl substituted imidazolium chloroaluminate, or a mixture thereof and a halide-containing additive; i. wherein the halide-containing additive is added to change the selectivity of the ionic liquid catalyst to make a converted olefinic feedstock; ii. wherein one or more linear internal olefins in the converted olefinic feedstock remain unconverted; and b. alkylating the converted olefinic feedstock with the iso-pentane to make one or more alkylate products.