隔离壁精馏塔萃取精馏制无水叔丁醇研究

用隔离壁精馏塔萃取精馏制无水叔丁醇,在溶剂比为1.5,回流比为2∶1,叔丁醇原料进料速度为1.7 mL/min时,塔顶叔丁醇的质量分数达到99.6%;塔釜乙二醇的质量分数达到97.7%,可直接作萃取剂循环利用。用AspenPlus对该工艺和二塔萃取精馏工艺对比,结果与实验相一致,塔顶叔丁醇质量分数的相对误差为0.4%,塔釜乙二醇质量分数的相对误差1.3%。结果显示,该工艺比现有工艺省了1个塔、1个再沸器和1个冷凝器,节能27%,降低了能耗和设备投资。

Study of extractive distillation of anhydrous tert-butyl alcohol in divided wall column

A divided wall column was applied in extractive distillation in order to gain anhydrous tert-butyl alcohol.Mass fraction of tert-butyl alcohol in top stream reached 99.6% and mass fraction of ethanediol in bottom stream reached 97.7% which could be recycled as solvent under the condition that feed rate was 1.7 mL/min and the reflux ratio was 2 ∶1 and the ratio of solvent was 1.5.The chemical process software Aspen Plus was applied to simulate the mentioned process and conventional process.The simulation result was accordant with the experiment result.The relative error of the mass fraction of tert-butyl alcohol in top stream was 1.3% and the relative error of the mass fraction of ethanediol in bottom stream was 0.4%.The simulation result indicated that the discussed process could save one column,one condenser and one reboiler,compared with the conventional process,and the energy costs reduced by 27%,which will decrease the equipment investment and consumption of energy resource.