Conceptual process design of extractive distillation processes for ethylbenzene/styrene separation

摘要: In the current styrene production process distillation of close-boiling ethylbenzene/styrene mixture to obtain an ethylbenzene impurity level 100 ppm in accounts for 75–80% energy requirements. The future target is reach a 1–10 ppm, which will increase requirements even further. Extractive well-known technology separate mixtures up high purities. objective this study was investigate whether extractive using ionic liquids (ILs) promising alternative purity styrene. Three ILs were studied: [3-mebupy][B(CN)4], [4-mebupy][BF4], and [EMIM][SCN]. with sulfolane conventional used as benchmark processes. IL [4-mebupy][BF4] expected outperform other two 11.5% lower operational expenditures are found be 43.2% than 5% distillations. However, capital about 23% those process. Finally, conclusion can drawn from total annual costs that all studied processes styrene, but evaluated not perform better