基于MVR热泵的三元混合烷烃热耦精馏

Thermally coupled distillation for separating ternary mixed alkane based on the MVR heat-pump

以正己烷、环己烷、异辛烷三元混合烷烃的分离为研究对象,利用Aspen Plus软件,选用RK-SOAVE方程,以年总费用(TAC)最低为目标函数,考察了中间组分分配比对热偶精馏的能耗及TAC等方面的影响,得到最佳分配比为0.47。在此基础上,把蒸汽再压缩(MVR)热泵技术应用于热偶精馏,提出了MVR热偶精馏工艺,研究了压缩比对MVR热偶精馏的影响,得到了相关的工艺参数和设备参数。研究结果表明,MVR热耦精馏与常规热耦精馏相比,可节能约38%,节省年总费用约48%。

The thermal coupled distillation is applied to separate ternary mixture alkane of n-hexane,cyclohexane and isooctane. By using the lowest total annual cost（ TAC） as objective function,the influence of the middle component split ratio on energy consumption and TAC is performed by Aspen Plus software with the RK-SOAVE equation. The optimum split ratio is 0. 47. Moreover,mechanical vapor recompression（ MVR） heat pump technology is also applied into thermally coupled distillation and the MVR thermal coupled distillation is put forward. The influence of compression ratio on the MVR thermal coupled distillation is performed. The process and equipment parameters are determined. The simulation results show that the MVR thermally coupled distillation can save energy by 38% and TAC by 48%,respectively,compared with the conventional thermal coupling distillation.