Middle-vessel batch extractive distillation with mixed solvents

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.