| C5 fraction was by-product generated in the process of crude oil cracking product ethylene and it was compose of active olefins and dienes, of which dienes especially cyclopentadiene, isoprene and 1,3-pentadiene were valuable raw materials of synthetic rubber industry because of their active chemical properties. Therefore, to study separation processes of C5 fraction has an important industrial value. But most of components in C5 fraction have a close boiling point and form a series of azeotropes, which caused separate process of C5 fraction more complicated. As a result, ordinary distillation can not achieve satisfactory effect for C5 separation. So to complete the separation process must have aid of some special distillation methods, such as extractive distillation.Because vapor liquid equilibrium among the components of C5 fraction are not perfect, in this paper, by using a self-designed vapor-liquid equilibrium apparatus , vapor liquid equilibrium data of four systems that contain cyclopentane-n-pentane, cyclopentene-isoprene, 2-methy-2-butene- cyclopentane, n-pentane- cyclopentene was determined at 250kPa pressure. And both of all the experiment data passed thermodynamic consistency test, correlation of the experiment data with Wilson and NRTL equations obtained quite satisfactory results which provide some model parameter for the next simulation calculation.With isoprene, n-pentane and cyclopentene as target product, the flow sheet of separation process by combining ordinary distillation with extractive distillation was designed. Then the process was simulated and optimized in Aspen Plus. It also discussed emphatically effect of feed stage, number of theoretical plate, reflux ratio and solvent-feed ratio on purity and yield of product. Finally, the purity and yield of isoprene, n-pentane and cyclopentene were respectively 97.84%,95.83%,86.66%,99.74%,99.36%,99.53%.
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