Optimization and model-based control of sustainable ethyl-methyl carbonate and diethyl carbonate synthesis through reactive distillation
Optimization and model-based control of sustainable ethyl-methyl carbonate and diethyl carbonate synthesis through reactive distillation
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DOI：
10.1016/j.jclepro.2022.133618
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发表时间：
2022-08
影响因子：
11.1
通讯作者：
Xiaolong Ge;Yicheng Han;P. Liu;Botan Liu;Botong Liu
中科院分区：
文献类型：
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作者：
Xiaolong Ge;Yicheng Han;P. Liu;Botan Liu;Botong Liu
碳酸二甲酯（EMC）和碳酸二乙酯（DEC）是锂离子电解质的优良溶剂，是由碳酸二甲酯（DMC）和乙醇进行酯交换反应合成的。当可持续发展成为一种必要时，过程强化、优化和相应的综合过程控制方案是必不可少的。本文首次提出了用常规反应精馏（RD）和反应分壁塔（RDWC）分别对EMC和DEC生产过程的强化流程进行了优化。与RD工艺相比，RDWC可使EMC和DEC生产工艺的年化总成本分别降低25.3%和8.2%。将RD和分离柱进一步整合到生产DEC和EMC的RDWC布置中，二氧化碳排放量可分别减少29.4%和11.7%。然后以多环PI控制方案为基准，设计线性模型预测控制器来处理持续进给扰动。通过在稳定时间、超调量和平方误差积分（ISE）方面的动态响应比较，特别是对于传统多环PI控制结构下控制性能较差的被控变量，证明了基于模型的控制器在强交互耦合系统中的优越性。综上所述，与PI控制策略相比，MPC的综合控制性能指标ise降低了55.9%-99.1%。
As excellent solvents of lithum-ion electrolyte, ethyl-methyl carbonate (EMC) and diethyl carbonate (DEC) are synthesized through transesterification of dimethly carbonate (DMC) and ethanol. Process intensification, optimization and the corresponding control scheme of the synthesized process are essential when sustainability is becoming a necessity. In the present work, the intensified flowsheet for EMC and DEC production process was firstly proposed and optimized with conventional reactive distillation (RD) and reactive dividing wall column (RDWC), respectively. Compared with RD process, RDWC could achieve 25.3% and 8.2% total annualized cost reduction for EMC and DEC production process, respectively. And carbon dioxide emission could be decreased by 29.4% and 11.7% by further integrating RD and separation column into RDWC arrangement for DEC and EMC production. Then multi-loop PI control schemes were developed as benchmark and linear model predictive controller was designed to handle the persistent feed disturbance. The superiorities of model-based controllers for the strongly interactive and coupled system are demonstrated by the dynamic response comparisons in terms of settling time, overshoot and integral of squared error (ISE), especially for the controlled variables with poor control performance under conventional multi-loop PI control structure. To summarize, the comprehensive control performance index-ISE with MPC is reduced by 55.9%–99.1%, as compared to those under PI control strategy.