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Sensitivity and dynamic behavior analysis of an industrial azeotropic distillation column

机译：工业共沸蒸馏塔的灵敏度和动态行为分析

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摘要

Distillation is a process with very low thermodynamic efficiency and it is also responsible for the highest consumption of global energy in industrial plants.The motivation for the study presented in this paper is to evaluate the possible reduction in energy consumption in the process of purification of 1,2-dichloroethane (EDC),which involves an azeotropic distillation column.In particular,the behavior of the column is considered unconventional for the following reasons:(1) the agent responsible for the azeotropic behavior is already in the feed and (2) the feed stream has a high concentration of EDC (more than 99%,w/w) and is far from the azeotropic point.The specific objectives of this work are the evaluation of the steady-state sensitivity of the column and the dynamic implications of its operation with energy reduction.The simulations in this study were conducted using the commercial simulator Aspen? and the results show that the reduction in energy consumption in the reboiler of the column brings about the eventual formation of two liquid phases in some stages within the column.It is therefore important to implement the temperature profile in the upper section of the column.By applying the recommendations in this paper,the engineers in the real plant were able to reduce the heat duty to the reboiler of the distillation column by 21%.
机译：蒸馏是一个热力学效率非常低的过程，它也是导致工厂中全球能源消耗最高的原因。本文提出的研究动机是评估1精制过程中可能减少的能源消耗。 ，2-二氯乙烷（EDC），涉及一个共沸蒸馏塔。特别是，该塔的行为被人们认为是非常规的，原因如下：（1）进料中已经存在引起共沸行为的试剂，（2）进料流中的EDC浓度高（w / w超过99％），并且离共沸点很远。这项工作的具体目标是评估色谱柱的稳态灵敏度以及其动态影响。本研究中的模拟是使用商用模拟器Aspen？进行的。结果表明，塔中再沸器能耗的降低导致塔内某些阶段最终形成两个液相，因此在塔上部实现温度分布非常重要。应用本文中的建议，实际工厂的工程师能够将蒸馏塔再沸器的热负荷降低21％。

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