請用此 Handle URI 來引用此文件:
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/46334
標題: | 不同相對揮發度排序對批次反應性蒸餾系統設計與操作的影響 Effect of Relative Volatility Ranking on the Design and Operation of Batch Reactive Distillation Systems |
作者: | Yu-Lung Kao 高玉龍 |
指導教授: | 吳哲夫(Jeffrey D. Ward) |
關鍵字: | 批次反應蒸餾,相對揮發度排序,程序設計,最適化,一般式批次蒸餾塔,逆轉式批次蒸餾塔,中槽式批次蒸餾塔, batch reactive distillation,relative volatility ranking,process design,optimization,conventional,inverted,middle-vessel, |
出版年 : | 2010 |
學位: | 碩士 |
摘要: | 結合了反應蒸餾系統的優點以及批次蒸餾在操作上的彈性,批次反應蒸餾系統逐漸受到學術界及工業界的重視,成為程序強化中一重要議題。然而,過去多數研究主要探討系統上模式的建構與模擬、可行性分析、程序的設計與控制,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。 一般來說,批次蒸餾塔可依儲槽以及出料位置分為:(1)一般式批次蒸餾塔: 儲槽位於塔底,出料於塔頂;(2)逆轉式批次蒸餾塔: 儲槽位於塔頂,出料於塔底;(3)中槽式批次蒸餾塔: 儲槽置於塔的中央,出料則可於塔底以及塔頂。
Tung 與 Yu (AlChE J.,53, 1278-1297, 2007) 利用一理想反應系統來探討相對揮發度對連續式反應蒸餾系統在架構與設計上之影響,他們考慮一可逆放熱反應 A + B <=> C + D的四成份系統,將原本24 (4!) 個可能相對揮發度排序,歸納出6類。在此研究中,我們將針對這6類相對揮發度排序,探討其對3種基本批次蒸餾塔架構在設計及操作上的影響,我們以生產力因子(CAP)為目標函數,進行設計與操作的最適化,結果發現,當反應系統裡其中一產物為最輕成份時,一般式批次蒸餾塔可達到分離目標,另一方面,當反應系統裡其中一產物為最重成份時,逆轉式批次蒸餾塔可達到分離目標,而利用中槽式批次蒸餾塔,在大多數情況下可獲得更好的結果。 進一步,我們探討一種更一般性的批次蒸餾塔架構,在此架構中,儲存槽可連接於塔的任何位置,不再限制於塔的頂部、塔的中央、或是塔的底部。最後,對於每一個相對揮發度排序種類,提出一最適當的設計架構以及對應的操作策略以達到最高的生產力。 Batch reactive distillation (BREAD) is an attractive process alternative which combines the advantages of reactive distillation and the flexibility of batch processes. There are three basic batch distillation column configurations: (1) Conventional batch distillation column (CBD): Feeds are charged at the bottom and products are taken out at the top. (2) Inverted batch distillation column (IBD): Feeds are charged at the top and products are taken out at the bottom. (3) Middle-vessel column (MVC): Feeds are charged in a middle-vessel of the column and products are withdrawn at the top and the bottom. Tung and Yu (AlChE J., 53, 1278-1297, 2007) used an ideal system to study the effect of relative volatility ranking on the design of column configuration for continuous RD systems. A reversible reaction A+B <=> C+D is considered and constitutes a quaternary system which has 24(4!) possible rankings according to the relativity volatility among reactants and products. They further grouped these 24 possibilities into 6 (24/2!/2!) distinct categories since the two reactants and two products are interchangeable. In this work, these 6 distinct volatility rankings are applied to the 3 basic BREAD column configurations to study the effects of relative volatility ranking on BREAD process design. The process design focuses on the choice of column configuration and the optimal collection policy including when and where to collect products and off-cuts and the corresponding reflux profile. The designs are optimized based on the batch capacity (CAP) defined as the total quantity of products meeting the purity specification produced divided by the total batch time. The results indicate that if one of the reaction products is the lightest key, a CBD column can achieve the separation objective. On the other hand, if one of the reaction products is the heaviest key, an IBD column can achieve the separation objective. Moreover, a MVC with a proper collection policy shows better performances in most of the cases. Furthermore, we investigate a new column configuration: a modified MVC in which the location of the reaction vessel is not exactly in the middle of the column. We consider the general case where the reaction vessel can be connected to the column at any point. If the reaction vessel is connected all the way at the bottom, we recover the CBD process whereas if it is connected all the way at the top, we recover the IBD. Finally, for each relative volatility ranking, we propose the most suitable column configuration and the collection policy with corresponding reflux profile which give the highest CAP. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/46334 |
全文授權: | 有償授權 |
顯示於系所單位: | 化學工程學系 |
文件中的檔案:
檔案 | 大小 | 格式 | |
---|---|---|---|
ntu-99-1.pdf 目前未授權公開取用 | 1.12 MB | Adobe PDF |
系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。