中间再沸式MVR热泵精馏回收处理二甲基乙酰胺稀溶液

Recycling of diluted DMAC aqueous solution based on inter-reboiler MVR heat pump distillation

针对DMAC-水溶液的精馏回收工艺中塔顶塔底温差大的特点,提出了中间再沸式热泵精馏工艺。利用Aspen Plus化工流程模拟软件对该工艺多种工况进行模拟,得出了最佳的中间再沸器位置和再沸比参数;通过分析,讨论了压缩机在系统中的控制作用。结果表明,在压缩机压缩比为2.0,再沸器最小传热温差为10.9℃情况下,本工艺相对于常规精馏可节能约85.9%。

Inter-reboiler mechanical vapor recompression （MVR） heat pump distillation is proposed based on the large temperature difference between tower top and tower bottom.The simulations for inter-reboiler MVR heat pump distillation are carried out by Aspen Plus software which includes a variety of condition.The location of inter-reboiler and reflux ratio are obtained.Besides that,the compressor in the system control function is also discussed.The results show that the inter-reboiler MVR heat pump distillation can save energy by 85.9％,compared with conventional distillation under the condition as follows：2.0 of the compressor compression ratio and 10.9℃ of reboiler minimum heat transfer temperature.