双溶剂进口的双釜间歇萃取精馏

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。

Study on dual-still batch extractive distillation with two solvent inlets

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 consumptio...