乙二醇反應蒸餾塔視窗程式設計

Windows Programming of Ethylene Glycol Reactive Distillation Column

林誌賢(Zin-Xian Lin)

指導教授 ： 林顯聖

國立臺北科技大學/工程學院/化學工程研究所/碩士(2010年)

摘要

本論文為開發一座乙二醇反應蒸餾塔模擬程式，提供教學訓練與學習之應用。乙二醇為一重要的化工原料，其製程為環氧乙烷加水反應而得。近年來反應蒸餾為生產乙二醇之新技術，反應蒸餾是將化學反應與蒸餾集合在同一操作單元，有別於傳統先反應再蒸餾之操作。反應蒸餾方式的優點是當反應有平衡限制時，反應蒸餾塔持續移除產物以打破化學平衡增加轉化率。反應蒸餾減少製程單元以增加經濟效益，也能增加熱效益。
　　本研究利用Microsoft Visual Basic 2005程式語言作為撰寫視窗程式之工具。本反應蒸餾塔模擬程式建構在質量平衡、能量平衡、相平衡上，並建立數個副程式模組。在本模擬中，原料可以從塔頂五個板進行各種不同比率的進料，使用者可以藉此了解進料分佈對產品濃度的影響。
　　從模擬結果可知，其穩態數據與文獻相近且動態應答也相當合理。根據穩態的討論結果，進料的分佈及比例為影響產品濃度的最主要因素，水過少時副產物會增加，水過多時產品濃度會下降。因此本模擬程式可幫助了解乙二醇反應蒸餾塔之特性以及控制策略研究之用。

關鍵字

反應蒸餾 ； 動態模擬 ； 視窗程式設計

並列摘要

The research expects to develop an ethylene glycol reactive distillation simulation provides for training and learning use. Ethylene glycol is an important industrial chemical, it produced from ethylene oxide hydration process. In recent years, reactive distillation is a new technology for ethylene glycol production. Reactive distillation is the process of simultaneous reaction and distillation in a single unit, offers numerous advantages over conventional configurations of reactors followed by separators. When reactions are equilibrium limited, reactive distillation continuously removes products, which dramatically in creases the overall conversion. The technique may prove economically attractive by reducing the number of processing units and providing direct heat integration between reaction and separation.
In this simulation program, Microsoft Visual Basic 2005 was used as a developing tool. The reactive distillation program develop with solving the mass balance, energy balance and phase equilibrium equations and then construct them to be a series of subroutine models. In this study, feed can be fed into not only one tray but also some different trays, the user can learn the influence of feed distribution and feed ratio. Windows interface was used to make user has the feeling like operating in a real factory.
From simulation results, the steady-state data is similar to references and the dynamic response is reasonable. According to the discussion of steady-state, feed ratios and feed distribution will significant affect reactive distillation. Therefore, this simulation program can helps understanding ethylene glycol reactive distillation characteristics and research of control strategy.

並列關鍵字

Reactive Distillation Column ； Dynamic simulation ； Windows programming

參考文獻

[1] D.L. Terrill, L.F. Sylvestre, M.F. Doherty, “Separation of closely boiling mixtures by reactive distillation. 1. Theory,” Industrial and Engineering Chemistry Process Design and Development, Vol. 24(4), pp. 1062-1071 (1985)

[2] W. Cleary, M.F. Doherty, “Separation of closely boiling mixtures by reactive distillation. 2. Experiments,” Industrial and Engineering Chemistry Process Design and Development, Vol. 24(4), pp. 1071-1073 (1985)

[5] R. Baur, R. Taylor and R. Krishna, “Dynamic behaviour of reactive distillation columns described by a nonequilibrium stage model,” Chemical Engineering Science, Vol. 56(6), pp. 2085-2102 (2001)

[6] R. Baur, R. Taylor and R. Krishna, “Dynamic behaviour of reactive distillation tray columns described with a nonequilibrium cell model,” Chemical Engineering Science, Vol. 56(4), pp. 1721-1729 (2001)

[7] A. R. Ciric and D. Gu, “Synthesis of nonequilibrium reactive distillation by MINLP optimization,” A.I.Ch.E.J., Vol. 40, pp. 1479 – 1487 (1994)