带有中间贮罐塔的混合溶剂间歇萃取精馏

Middle-Vessel Batch Extractive Distillation with Mixed Solvents

采用一个带有中间贮罐的间歇精馏实验塔,对混合溶剂间歇萃取精馏过程进行了实验研究.实验结果表明,带有中间贮罐的间歇萃取精馏过程在很长一段时间内具有塔顶采出产品,同时具有在塔底采出混和溶剂的特点,因而与常规间歇萃取精馏过程相比,带有中间贮罐塔时间精馏技术需要的再沸器体积大大减小.另外,混合溶剂萃取精馏过程与简单溶剂萃取精馏过程相比,克服了简单萃取剂自身选择性与溶解性之间的矛盾,提升了萃取精馏工艺的分离效果及使用范围,并且没有增加原有工艺过程的复杂性.

A batch extractive distillation process with mixed solvents was studied experimentally in a middle- vessel batch distillation column. Experimental results showed that the mixed solvents at the bottom and the product at the top of the column can be removed simultaneously for a long period of time in the middle-vessel batch distillation, and thus it requires a much smaller reboiler compared with a regular column. In addition, the extractive distillation process with mixed solvents have a better performance and a wider use compared with that with single solvent in the same condition, and it can not only overcome conflict of single solvent＇ s selectivity and solubility, but also not increase the complexity of original technology.