Abstract: This paper proposes a new mode of batch extractive distillation with two stills and two solvent inlets. The liquid reflux in the column containing solvent does not flow into the batch reboiler，but into a simple distillation still，from which only vapor phase flows into batch reboiler while the solvent flows back into the column. This separation of ethanol-water azeotrope using glycol as solvent is analyzed. The result shows that when the system is operated twice，the output is the greatest and the consumption is the least. The new operation mode has such advantages as stable still temperature changes，and less fresh solvent consumption.

摘要： 提出了带有塔底回收釜及双溶剂进口的间歇萃取精馏操作方式。在新操作方式中，塔内回流液不流回塔釜，而是流入塔底回收釜，再经简单蒸馏气相返回塔釜，回收后的溶剂返回精馏塔中。以乙二醇作溶剂分离乙醇-水物系的实验结果表明，当间歇操作次数为2时，产品采出率最大，单位产品消耗的新鲜溶剂量最少。新操作方式具有塔釜温度变化平稳，新鲜溶剂用量相对较少等优点。