Wei Hong-Mei, Wang Fu-Jie, Yan Hong-Wei, Jiao Wei-Zhou, Wei Wei
Department of Mechanical Engineering, North University of China, No.3 Xueyuan Road, Taiyuan 030051, Shanxi, China.
Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering, North University of China, No.3 Xueyuan Road, Taiyuan 030051, Shanxi, China.
ACS Omega. 2023 Jun 2;8(23):20450-20470. doi: 10.1021/acsomega.3c00656. eCollection 2023 Jun 13.
Process economy and dynamic controllability are critical for DMC/MeOH separation via the PSD process. In this paper, rigorous steady-state and dynamic simulations of atmospheric-pressurized process for DMC/MeOH separation with no, partial, and full heat integration have been carried out with Aspen Plus and Aspen Dynamics. Further investigations have been conducted into the economic design and dynamic controllability of the three neat systems. Simulation results indicated that: the separation process via full and partial heat integration provided TAC savings of 39.2 and 36.2%, respectively, compared to that of no heat integration; the non-heat-integrated system displays good dynamic performance, critical dynamic penalties were demonstrated for both partial and full heat integration processes, while the partial one exhibited a more robust control except for precisely maintaining X(DMC); a PCTC scheme with a CC/TC cascade control was proposed to precisely maintain the product concentration for the fully heat-integrated PSD process. A comparison of the economy between atmospheric-pressurized and pressurized-atmospheric sequences indicated that the former is more energy efficient. Further, a comparison of the economy between atmospheric-pressurized and pressurized-atmospheric sequences indicated that the former is more energy efficient. This study will provide new insights into the energy efficiency and has some implications for design and control of DMC/MeOH separation in the industrialization process.
对于通过压力切换吸附（PSD）过程分离碳酸二甲酯（DMC）/甲醇（MeOH）而言，过程经济性和动态可控性至关重要。本文利用Aspen Plus和Aspen Dynamics对常压下DMC/MeOH分离过程进行了严格的稳态和动态模拟，该过程有无热集成、部分热集成和完全热集成三种情况。进一步研究了这三种纯系统的经济设计和动态可控性。模拟结果表明：与无热集成相比，完全热集成和部分热集成的分离过程分别节省了39.2%和36.2%的总年度成本（TAC）；无热集成系统具有良好的动态性能，部分热集成和完全热集成过程均显示出严重的动态惩罚，而部分热集成系统除了精确维持DMC的摩尔分数（X(DMC)）外，表现出更强的鲁棒控制能力；针对完全热集成的PSD过程，提出了一种采用串级控制（CC）/温度控制（TC）的压力-温度控制（PCTC）方案，以精确维持产品浓度。常压和加压-常压流程的经济性比较表明，前者更节能。此外，常压和加压-常压流程的经济性比较表明，前者更节能。本研究将为能源效率提供新的见解，并对DMC/MeOH分离工业化过程中的设计和控制具有一定的指导意义。
