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C5 fraction of petroleum hydrocarbon pyrolysis of Ethylene process byproduct containing isoprene and other ingredients , they are an important raw material for synthetic rubber industry has important practical significance to study the process of separation of isoprene from C5 fraction . C5 fraction containing the multiple close-boiling substances , and the formation of a variety of azeotrope , is difficult to separate with a method of the normal distillation , extractive distillation is an effective separation means . In this paper, the principle of extractive distillation and the process of extracting agent , selected on the basis and method . For C5 in the various components , the N - methyl-2 - pyrrolidone (NMP) as the extraction agent, the use of QY-2 - type vapor - liquid equilibrium data for the analyzer is preferable that the two-step experiments mixed extractant . To optimize mixed extractant continuous extractive distillation experimental study investigated the reflux ratio and the dosage ratio effect of separation , the initial realization of the intended purpose of isoprene . QY-2 VLE data analyzer measured atmospheric isoprene - NMP n-pentane - NMP, 2 - methyl-2 - butene - NMP , cyclopentane - NMP , cyclopentyl ene -NMP, isoprene -1,4-dioxane and n-pentane -1,4-dioxane seven binary VLE data , the experimental data and the vapor-liquid equilibrium thermodynamic consistency check , respectively Wilson, NRTL and UNIQUAC model associated experimental data , the results are more satisfied . The results of this study provide a the C5 hydrocarbon - N - methyl-2 - of pyrrolidone and C5 hydrocarbon -1 ,4 -dioxane binary VLE data , can provide the basic data for the actual process of development .
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