提出了采用萃取精馏隔壁塔精制含水乙腈的新工艺，并与传统的双塔萃取精馏工艺进行了对比。以乙二醇为萃取剂，采用Aspen Plus中的RadFrac模型对新工艺进行了严格稳态模拟，并分析了溶剂比、主塔回流比、原料进料位置、分配比和互联位置对乙腈质量分数和全塔热负荷的影响。结果表明，隔壁萃取精馏塔的最佳工艺条件为：溶剂比为0.9，主塔回流比为22，原料进料位置为9~13块，分配比为4：1，互联位置为21块板。完成相同的分离任务，比传统的双塔萃取精馏工艺节能62%，同时减少了设备的数目和投资。

A new technology for refining water containing acetonitrile by using an extractive distillation dividing wall column is presented and compared with the traditional dual extractive distillation columns process.With ethylene glycol as extraction agent,the rigorous steady-state simulations for the new technology are implemented by means of the RadFrac model in commercial software Aspen Plus.The sensitivity analysis module is used to analyze the effects of solvent ratio,reflux ratio,feed position,vapor split ratio and connect position on the mass fraction of acetonitrile product and the whole columns heat load.The simulation results reveal the best conditions for the extractive distillation dividing wall column as follows:the solvent ratio is 0.9,the reflux ratio is 22,the feed position is at the 12th plate,the vapor split ratio is 4:1 and the connect position is at the 21st plate.Compared with the conventional extractive distillation dual columns technology,the extractive distillation dividing wall column technology saves energy by 62% and reduces numbers of equipment and investment.

赵云鹏(1996-),男,本科生