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以离子液体1-乙基-3-甲基咪唑磷酸二乙酯盐([EMIM]DEP)为萃取剂精馏分离乙酸甲酯/甲醇共沸物。采用Aspen Plus流程模拟软件,对萃取流程进行设计和优化。通过优化溶剂比、全塔理论塔板数、原料进料位置、萃取剂进料位置和回流比等工艺参数,最终产品乙酸甲酯和甲醇质量分数均超过99.5%。通过与二甲基亚砜(DMSO)作为萃取剂的工艺流程对比,[EMIM]DEP流程萃取剂用量仅为DMSO流程萃取剂用量的17%,能耗仅为DMSO流程的45%。在2个流程均能满足分离要求的前提下,[EMIM]DEP流程的塔板数、回流比、能耗均低于DMSO流程,这也意味着设备投资费用和生产操作费用更低。
The methyl acetate / methanol azeotrope was fractionated using an ionic liquid, 1-ethyl-3-methylimidazolium phosphate diethyl phosphate ([EMIM] DEP) as an extractant. Design and optimize the extraction process using Aspen Plus process simulation software. By optimizing the solvent ratio, the number of theoretical plates in the whole tower, the feed position of the raw material, the feeding position of the extractant and the reflux ratio, the mass fraction of methyl acetate and methanol in the final product all exceeded 99.5%. Comparing with the process of dimethylsulfoxide (DMSO) as extractant, [EMIM] DEP extractant dosage was only 17% of that of DMSO extractant and the energy consumption was only 45% of that of DMSO. With both processes meeting the separation requirements, [EMIM] DEP processes have lower plate counts, reflux ratios, and lower energy consumption than DMSO processes, which means lower equipment investment and operating costs.