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標題: | 不同相對揮發度排序在反應性蒸餾系統設計的影響:過量反應物設計 Effects of Relative Volatility Ranking to the Design of Reactive Distillation: Excess-reactant Design |
作者: | Li-Chiang Lin 林立強 |
指導教授: | 余政靖(Cheng-Ching Yu) |
關鍵字: | 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, |
出版年 : | 2007 |
學位: | 碩士 |
摘要: | 多功程序在程序強化中是相當重要之一環,而多功程序中最主要例子為反應性蒸餾。過去10年的研究主要強調可行性分析、設計或控制方式探討,但針對相同或不同系統,在程序設計上,缺乏一系統化的整體概念性設計。在此研究中,礙於真實系統的複雜性,我們改而對一理想系統作探討,我們考慮一四成分的可逆放熱反應(A+B↔C+D),並且忽略產物與反應物間個別的相對揮發度排列,最後歸列出6種可能的不同相對揮發度排列(4!/2!2!)。針對這些不同的相對揮發度排列,我們以年總成本(TAC)做為比較基準來找出最佳架構。在設計上,我們先以無回流反應性蒸餾系統(Neat)當作主軸,提出一系列的設計,並且針對其架構做更進一步設計,提出過量反應物(Excess-reactant)的設計步驟以及成果,此外,除了反應性蒸餾系統外,傳統反應/分離系統(Conventional)也將被探討,最後延伸其應用面,改變平衡常數(0.1~100)來涵蓋大部份反應系統的發生。結果顯示,相對揮發度排序不論在反應性蒸餾系統與傳統反應/分離系統設計與結果上皆扮演一個非常重要的角色,不同的相對揮發度排序表現出不同的設計架構,並且展現出不同的時機(平衡常數)採用過量反應物設計,同時也得到相差甚遠的年總成本,此外從結果也得知,針對所有可能之排序,反應性蒸餾系統的年總成本會較傳統反應/分離系統來的低廉,此結果也再次顯示出此種多功程序的重要性。 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. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/27592 |
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顯示於系所單位: | 化學工程學系 |
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