Comparative optimal design and effective control of different pressure extractive distillation for separating acetone - methanol
Comparative optimal design and effective control of different pressure extractive distillation for separating acetone - methanol
复制标题
DOI：
10.1016/j.seppur.2022.121936
复制
发表时间：
2022-08
影响因子：
8.6
通讯作者：
Jiyan Liu;Mengru Dong;Junyao Ren;Yang Wu;Jie Kong;G. Wan;Lanyi Sun
中科院分区：
文献类型：
--
作者：
Jiyan Liu;Mengru Dong;Junyao Ren;Yang Wu;Jie Kong;G. Wan;Lanyi Sun
丙酮和甲醇是重要的工业原料以及有机溶剂。以往对变压萃取精馏分离低沸共沸丙酮-甲醇的研究表明，变压萃取精馏在节能和节约成本方面具有优势。然而，变压配置不可避免地需要高档热蒸汽。为了突破这一限制，本文提出了一种新的异压萃取精馏策略。从热力学角度出发，进行了不同压力萃取精馏配置的概念设计，确定了夹带物/进料流量比和回流比的可行范围。采用改进的非支配排序遗传算法对设计参数进行优化。与传统萃取精馏工艺相比，该工艺的年总成本（TAC）和二氧化碳排放量分别降低22.17%和48.14%。通过改变进料热条件，获得了带进料预热的异压萃取精馏替代工艺，与传统萃取精馏工艺相比，TAC降低24.08%，co2排放量降低48.33%。与现有热集成变压萃取精馏工艺相比，新工艺的TAC和co2排放量分别降低2.90%和22.36%。随后，通过计算稳态设计阶段的可控性指标，提出了两种控制方案。结果表明，采用多前馈控制回路的改进控制方案具有最佳的鲁棒性。
Acetone and methanol are critical industrial feedstocks as well as organic solvents. Previous studies on the separation of the minimum-boiling azeotrope acetone-methanol by pressure-swing extractive distillation have shown superiority in terms of energy and cost savings. However, the pressure-varying configuration inevitably requires high-grade heat steam. To surpass the limitation, a novel different pressure extractive distillation strategy is proposed in this paper. The conceptual design of the different pressure extractive distillation configuration is carried out from thermodynamic insights, and the feasible ranges of entrainer/feed flow rate ratio and reflux ratio are determined. The design parameters are optimized by an improved non-dominated sorting genetic algorithm. Compared with the conventional extractive distillation process, the total annual cost (TAC) and CO2emissions of the proposed process are reduced by 22.17% and 48.14%, respectively. An alternative different pressure extractive distillation process with feed preheating is then obtained by changing feed thermal condition, which has a 24.08% reduction in TAC and a 48.33% reduction in CO2emissions in comparison with the conventional extractive distillation process. Compared with the existing heat-integrated pressure-swing extractive distillation process, the new process has a 2.90% and 22.36% reduction in TAC and CO2emissions, respectively. Subsequently, two control schemes are presented by calculating controllability indicators in the steady-state design stage. The results illustrate that the improved control scheme with multiple feedforward control loops performs the best robustness.