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The Study of Optimal Operating Parameters to Purify Anhydrous Ethanol with Molecular Sieves
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因應全球性能源發展趨勢及溫室氣體效應，生質能源的應用逐漸被重視，而酒精汽油為其中一種替代能源，需將酒精濃度99.3 wt%以上之無水酒精摻入油品中作為車用燃料可降低空氣汙染。因此本研究建立一套生質酒精生產系統，以3-A型分子篩做為吸附劑將酒精脫水，當分子篩吸附酒精中的水分達飽合後，需利用高溫氮氣持續加熱進行再生還原，分子篩方可重複再利用。研究過程中，亦利用反應曲面法探討分子篩還原之最佳操作模式，以供大型工廠量產時之參考依據。本研究中以糖蜜做為酒精原料，經發酵後再經蒸餾塔進行蒸餾，經冷凝器冷凝後並配製95.08 wt% 之酒精濃度，以此樣本濃度進行分子篩再生還原後的測試，經實驗最佳化分析結果顯示，當分子篩還原溫度設定在193℃並持續加熱7小時40分下，其分子篩還原所需成本最低 (單位能源產率為0.283 (L/ kW-hr))，可產出60公升之無水酒精，而用電量為212.1 kW-hr。
In response to the global energy development trend and greenhouse effects, bio-energy applications gradually are being taken seriously. Gasohol is one of the alternative energy. The mixture of anhydrous ethanol which purity was 99.3 wt% or higher blended with gasoline is served as a car fuel that reduces air pollution. Therefore, a system was constructed for bio-ethanol production in this study, and 3A-type molecular sieves were used as adsorbent on ethanol dehydration. When particles in molecular sieves adsorb the water from ethanol samples until they are saturated, regeneration is performed using continuous heating with high-temperature nitrogen. Furthermore, molecular sieves can be reused in every regeneration cycle.
During the study, we also applied a response surface methodology to determine an optimized operational model for molecular sieves regeneration. In this study the molasses is used as a raw material for ethanol production. The molasses was fermented and then distilled using the distillation tower. Through the distillation tower, it can produce up to 95.08 wt% of the ethanol concentration in its mixture. This sample was further concentrated using molecular sieves. The results of optimization analysis indicated that the cost of molecular sieves regeneration (the unit energy yield was 0.283 L/ kW-hr) was the lowest at a temperature of 193 �C and a heating time of 7 hr and 40 min. The results also demonstrated that to yield 60 L of anhydrous ethanol did have an energy consumption of 212.1 kW-hr.
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