多组分间歇精馏塔的收率及控制持液量操作过程的研究

Multicomponent Batch Distillation Yield and Controlled Holdup Operation

通过讨论间歇精馏塔理论板数对产品收率的影响,提出了极限收率的概念,并建立了理论板数与极限收率的关系,能用以评价现有塔设备的合理性,指导间歇精馏塔理论板数的确定.在极限收率概念的基础上,本文提出了在适当时刻移出塔身持液做为中间馏分的新操作方法,减弱了浓度拖尾现象,明显地提高了生产效率.对于变参数控制持液量操作进行了数学模拟及实验验证,结果表明,该操作方法切实可行,实验和计算结果吻合较好.

A concept of limiting yield is proposed in light of the dependence ofbatch distillation yield on the number of theoretical plates. The number of theoretical plates corresponding to the limiting yield may be used as the criterion in designing a batch distillation column and evaluating an existing column. On the basis of limiting yield, the authors develope a new operation mode by controlling the column holdup in such a way that in a predetermined moment, some of the holdup is withdrawn from the column as an intermediate fraction in order to reduce the tailing effect and to increase the separating efficiency. Experimental work was carried out with success in confirming the proposed controlled holdup operation. Method of simulation is also reported and the theoretical computation agrees satisfactorily with the experimental result.