Patent ID: 7699962

Claim:
A method for separating components of a mixture, the method comprising contacting an extractive agent with an azeotrope-like mixture, the mixture comprising at least one dissolved C 4 -C 7 isoolefin monomer and a diluent comprising one or more hydrofluorocarbon(s), to form a stream of hydrofluorocarbon that is essentially free of the at least one dissolved monomer, wherein the ratio of the extractive agent to the diluent is from about 0.5:1 to about 1.0:0.2 on a molar basis, wherein the extractive agent comprises at least one hydrocarbon, wherein the at least one hydrocarbon comprises butane, pentane, methycyclopentane, isohexane, 2-methylpentane, 3-methylpentane, 2-methylbutane, 2,2-dimethylbutane, 2,3-dimethylbutane, 2-methylhexane, 3-methylhexane, 3-ethykentane, 2,2-dimethylpentane, 2,3-dimethylpentane, 2,4-dimethylpentane, 3,3-dimethylpentane, 2-methylheptane, 3-ethylhexane, 2,5-dimethylhexane, 2,2,4,-trimethylpentane, octane, heptane, , nonane, decane, dodecane, undecane, hexane, cyclopropane, cyclobutane, cyclopentane, , 1,1-dimethylcyclopentane, cis 1,2-dimethylcyclopentane, trans-1,2-dimethylcyclopentane, trans-1,3-dimethylcyclopentane, ethylcyclopentane, cyclohexane, methylcyclohexane, or mixtures thereof and wherein the hydrofluorocarbon(s) is represented by the formula: C X H y F z wherein x is an integer from 1 to 6 and y and z are integers of one or more.