3A及4A吸附劑對水和乙醇吸附之實驗及吸附塔貫流行為之模擬; Adsorption experiment for water and ethanol on 3A and 4A zeolite and simulation of breakthrough performance in the bed

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Title:	3A及4A吸附劑對水和乙醇吸附之實驗及吸附塔貫流行為之模擬;Adsorption experiment for water and ethanol on 3A and 4A zeolite and simulation of breakthrough performance in the bed
Authors:	陳義杰;Yi-jie Chen
Contributors:	化學工程與材料工程研究所
Keywords:	酒精;乙醇;水;貫流;ethanol;water;breakthrough;dehydration
Date:	2010-07-12
Issue Date:	2010-12-08 13:36:02 (UTC+8)
Publisher:	國立中央大學
Abstract:	在酒精和水的分離技術當中，由於一大氣壓下，酒精和水組成為95.6wt％乙醇時，在78.2℃會產生共沸點，而吸附分離相較於傳統共沸蒸餾或萃取蒸餾為一種較節能的程序，因此被廣泛注意將其運用在酒精脫水。本論文先利用實驗方式，藉由對純水和純酒精飽和吸附量的測量，使用3A和4A分子篩當作吸附劑，得到不同的吸附平衡數據。再藉由Langmuir等溫線吸附平衡關係式利用數學分析的方式，取得等溫吸附平衡曲線圖及其參數。最後利用模擬方式得到不同的貫流曲線，進料組成為18.2mol％水蒸汽和81.8mol％酒精蒸氣的混合氣體，使用3A和4A分子篩當作吸附劑，在單一吸附塔中進行模擬。研究中藉由改變不同的操作條件（如塔內壓力、塔內溫度及吸附塔塔長），探討各種變因對貫流行為的影響。結果發現當塔內溫度增加時，貫流時間會減少。而當塔內壓力、吸附塔塔長增加時，貫流時間則會增加。 In the distillation separation of ethanol vapor and water vapor, it can form an azeotrope at 78.2℃, at which there are 95.6wt% ethanol and 4.4wt% water. Traditional azeotropic distillation and extractive distillation to obtain anhydrous ethanol need more energy than adsorption. Adsorption as a low energy consumption process has attracted attention to apply in ethanol dehydration. This study obtained single component adsorption equilibrium data by the adsorption experiment for water and ethanol on 3A and 4A zeolite. Then this study obtained the isotherm curve and the parameters by numerical method. The adsorption is expressed by the Langmuir isotherm. The isotherm is applied to analyze the effect of the variables such as bed pressure, bed temperature, and bed length on the breakthrough performance. The simulation results show that the breakthrough time decreased with increasing bed temperature, and the breakthrough time increased with increasing bed length and bed pressure.
Appears in Collections:	[National Central University Department of Chemical & Materials Engineering] Electronic Thesis & Dissertation

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