A version of the Sorbex process for separating olefins from paraffins in wideboiling mixtures. It can be used for hydrocarbons in the range C6 — C20. Based on the selective adsorption of olefins in a zeolite and their subsequent recovery by displacement with a liquid at a different boiling point. Mainly used for extracting C11 — C14 olefins from the Pacol process. As of 1990, six plants had been licensed