Effects of Relative Volatility Ranking to the Design of Reactive Distillation: Excess-reactant Design
Date Issued
2007
Date
2007
Author(s)
Lin, Li-Chiang
DOI
zh-TW
Abstract
Multifunctional process unit is an important element in process intensification and reactive distillation is one of the most common examples. For the recent ten years, the progress focus on understanding the feasibility, design, and, in some cases, control of reactive distillation. On the other side, for the design of same or different process, a systematic design procedure which is capable of covering a wide range of system parameters is lacking. The objective of this work is aimed to provide a systematic design procedure to determine the configuration of process. Instead of investigating real chemical systems, ideal chemical reaction systems with different relative volatility rankings will be studied. This provides a gradual transition as the reaction and separation properties change. The reaction considered is a reversible reaction A+B↔C+D, and this constitutes a quaternary system with 24 (4!) possible relative volatility arrangements. These 24 systems can further be grouped into six categories (4! /2! 2!) according to the ranking of relative volatilities of reactants and products. The likely process configurations will be explored and design will be optimized based on the total annual cost (TAC). First, in this work, proposing the configuration of neat design for those six categories, future more, excess design which is used to improve the performance of Neat design also be proposed. In addition to reactive distillation, the conventional reaction/separation system is also considered in order to do a basis of comparison. Finally, extending the application of this work, the equilibrium is changed (0.1~100) to cover almost all reaction, which is taken in real world. The results clearly indicate that the relative volatility rankings play a dominant role in the design and result of both reactive distillation and conventional reaction/separation process. Different relative volatilities ranking needs different configuration and has different timing (equilibrium constant) to use excess design, in the mean time, showing the different total annual cost (TAC). Besides, the result also indicates that the reactive distillation compares to conventional reaction/separation progress process has the lower TAC. The result tells us the important of multifunctional process unit, again.
Subjects
反應蒸餾
過量反應物設計
理想系統
相對揮發度排序
概念性設計
reactive distillation
Excess-reactant Design
ideal system
Relative volatility ranking
conceptual design
Type
thesis
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