中间再沸式热泵反应精馏生产乙酸异丁酯的设计与控制

Design and Control of Isobutyl Acetate Synthesis by Inter-Reboiler Heat Pump Reactive Distillation

基于传统反应精馏(CRD)合成乙酸异丁酯(IBAC)塔顶塔底温差较大的特点,提出中间再沸式热泵反应精馏(IR-HPRD-1)以及带预热器的中间再沸式热泵反应精馏(IR-HPRD-2)流程。采用Aspen软件对其进行优化,得到最优工艺操作参数。在稳态模拟基础上,采用奇异值分解法(SVD)找出温度灵敏板,对IR-HPRD-2流程设计了可行的控制方案。结果表明:与CRD工艺相比,IR-HPRD-1和IR-HPRD-2的年总能耗(TUC)分别降低44.33%和47.55%,年总费用(TAC)分别降低16.92%和19.13%,IR-HPRD-2在节能与降低TAC方面更优于IR-HPRD-1;在±20%进料流率与5%进料组分扰动下,该可行性控制方案能在短时间内有效控制产品质量。

Often there is a large temperature difference between the top and bottom of the conventional reactive distillation (CRD) for the isobutyl acetate synthesis. Based on this characteristic, we proposed two processes, the inter-reboiler mechanical vapor recompression heat pump reactive distillation without (IR-HPRD-1) and with preheater (IR-HPRD-2). The parameters of those two processes were subsequently optimized by employing Aspen software. Later, the singular value decomposition (SVD) method was used to find the temperature sensitive stages, and a feasible control scheme was designed for the IR-HPRD-2 process. The results show that compared with the conventional CRD process, the TUC of IR-HPRD-1 and IR-HPRD-2 decrease by 44.33% and 47.55%, respectively, and TAC decrease by 16.92% and 19.13%, respectively. Moreover, IR-HPRD-2 shows better performance than IR-HPRD-1 on the energy saving and reducing. Overall, the control scheme can effectively control the quality of the product in a short time under the disturbance of the ±20% feed flow rate and the 5% feed component.