Process Development, Assessment, and Control of Reactive Dividing-Wall Column with Vapor Recompression for Producing n-Propyl Acetate,Industrial & Engineering Chemistry Research

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Process Development, Assessment, and Control of Reactive Dividing-Wall Column with Vapor Recompression for Producing n-Propyl Acetate
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-12-28 , DOI: 10.1021/acs.iecr.8b05122
Zemin Feng ₁ , Weifeng Shen , G. P. Rangaiah ₁ , Liping Lv ₂ , Lichun Dong ₂

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As a combination of the conventional reactive distillation (RD) and diving-wall column, reactive diving-wall column (RDWC) is the highly thermally integrated process that has the advantages of higher thermodynamic efficiency, lower capital cost, and smaller equipment size. In this study, the conceptual design of four different RD processes, i.e., the conventional RD, RDWC, heat-integrated RDWC (HIRDWC), and vapor recompression heat-pump-assisted RDWC (VRHP-RDWC), was presented for the production of n-propyl acetate via the esterification of n-propanol with acetic acid. The results indicate that compared with that of conventional RD process the total annual cost of RDWC, HIRDWC, and VRHP-RDWC intensified processes is reduced by 10.44, 19.40, and 74.54%, respectively, while their thermodynamic efficiency is 9.96, 15.52, and 25.53%, respectively, which are also significantly higher than that of conventional RD process (9.25%). Subsequently, since the VRHP-RDWC process exhibits the most favorable performance for intensifying the conventional RD process, two alternative control strategies were developed and assessed for the operation of VRHP-RDWC. Control performances demonstrate that the challenging VRHP-RDWC process can be operated smoothly under large disturbances of feed flow rate, water impurity in acetic acid feed, and n-propanol feed as well as for set-point changes in temperature controllers.

中文翻译：

气相减压生产乙酸正丙酯的反应式分隔壁塔的工艺开发，评估和控制

作为传统反应蒸馏（RD）和潜水壁塔的组合，反应潜水壁塔（RDWC）是高度热集成的工艺，具有较高的热力学效率，较低的投资成本和较小的设备尺寸。在这项研究中，提出了四种不同的RD工艺的概念设计，即常规RD，RDWC，热集成RDWC（HIRDWC）和蒸汽再压缩热泵辅助RDWC（VRHP-RDWC），用于生产通过n的酯化反应生成乙酸正丙酯丙醇与乙酸。结果表明，与常规RD工艺相比，RDWC，HIRDWC和VRHP-RDWC强化工艺的年总成本分别降低了10.44、19.40和74.54％，而其热力学效率分别为9.96、15.52和25.53。％，分别也显着高于常规RD工艺（9.25％）。随后，由于VRHP-RDWC工艺在增强常规RD工艺方面表现出最有利的性能，因此针对VRHP-RDWC的运行开发了两种替代控制策略并进行了评估。控制性能证明具有挑战性VRHP-RDWC过程能够顺利下进料流速，在乙酸进料水杂质，和大扰动进行操作Ñ-丙醇进料以及温度控制器的设定点变化。

更新日期：2019-01-01

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