Control of energy-efficient extractive distillation configurations for separating the methanol/toluene azeotrope with intermediate-boiling entrainer
Control of energy-efficient extractive distillation configurations for separating the methanol/toluene azeotrope with intermediate-boiling entrainer
复制标题
使用中沸点共沸剂分离甲醇/甲苯共沸物的节能萃取精馏配置的控制
DOI：
10.1016/j.cep.2020.107862
复制
发表时间：
2020-03-01
影响因子：
4.3
通讯作者：
Du, Jian
中科院分区：
文献类型：
--
作者：
Wang, Chao;Zhuang, Yu;Du, Jian
以中沸三乙胺(Et3N)为溶剂，对常规萃取精馏(CED)、热集成萃取精馏(TID)和萃取隔壁塔(EDWC)三种萃取精馏装置的稳态设计和动态性能进行了研究和比较。结果表明，与CED相比，TIE和EDWC结构分别可节省21.28%和52.70%的能耗，但由于工艺流程较复杂，控制难度较大。为此，通过引入进料吞吐量和成分扰动，建立了两种EDWC控制结构，并对其中一种控制结构和五种控制结构进行了验证。与CED类似，TIE和EDWC结构的控制结构也可以将产品纯度和积分平方误差(ISE)保持在可接受的范围内，以抵抗进料扰动。此外，与CED相比，EDWC配置仍然反映了较高的能效，并在平滑后并列。
The steady-state design and dynamic performances of three extractive distillation configurations including conventional extractive distillation (CED), thermally integrated extractive distillation (TIED) and extractive dividing-wall column (EDWC) are investigated and compared for separating the methanol/toluene azeotrope with intermediate-boiling triethylamine (Et3N) as solvent. The results show that TIED and EDWC configurations can save 21.28 % and 52.70 % energy consumption compared to CED, respectively, but the difficulty of controllability will be increased due to a more complex flowsheet. Towards this end, two control structures for EDWC are established and tested via introducing feed throughput and compositions disturbances as well as one control structure for CED and five control structures for TIED. Similar to CED, the control structures of TIED and EDWC configurations can also maintain products purifies and integral squared error (ISE) within the acceptable range in resisting feed disturbances. Furthermore, EDWC configuration still reflects high energy-efficiency compared to CED and TIED after smoothing.