合成氣觸媒反應生成生質甲醇製程最適化研究

Optimum Study on the process of Biomass Methanol production from Syngas Catalytic Reaction

藍禹捷(Yu-Chieh Lan)

指導教授 ： 鍾財王

中原大學/工學院/化學工程研究所/碩士(2021年)

https://doi.org/10.6840/cycu202100372

摘要

現今科技發展對於能源的需求逐漸提高，故尋找替代能源成為發展關鍵，而為了達到環保訴求，氫能及生質能十分受到關注，但氫能由於儲存及運輸問題而發展受限，生質能也因為有溫室氣體排放疑慮，造成發展受阻。而本研究是將生質燃料氣化或熱裂解後的合成氣為原料，透過商業觸媒Cu/ZnO/Al2O3催化成生質甲醇，除了可以解決氫能面對的問題，也可以降低生質能製造時溫室氣體的排放量。由於催化過程除了觸媒種類會影響反應效果，操作參數亦攸關經濟成本、能源消耗、產率表現，故在此研究主要針對操作參數進行最佳化探討。分為四個部分，分別為單一變數討論、回應取面(Response Surface Methodology, RSM)最佳化探討、反應氣體成分調整、壓力參數影響，藉由以上逐一討論。
以單一變數討論得知反應溫度及H2/CO體積流量比影響顯著，且透過RSM發現反應溫度為215℃及H2/CO體積流量比為2.5時，有最佳甲醇產量，再由調整H2/CO/CO2比例，觀察到Cu/ZnO/Al2O3較適合氫化一氧化碳，但於反應氣體加入部分二氧化碳具有產量提升的效果，最後藉由增加反應壓力，使得甲醇產量明顯提高7-8倍，並且再加壓狀態下，氫氣在合成氣比例對於產量影響變小，可作為日後是否裝設加氫設備之依據。

關鍵字

商業觸媒Cu/ZnO/Al2O3 ； 生質甲醇

並列摘要

Since the demand of energy in the development of Science and technology is gradually increasing, developing alternative energy has become the key. To meet environmental protection requirements, hydrogen energy and biomass energy have attracted attention, but the development of hydrogen energy is limited due to storage and transportation problems. Besides, biomass energy has been hindered because of greenhouse gas emissions. In this study, the syngas from gasification or pyrolysis of biomass is used for synthesizing biomethanol by commercial catalyst Cu/ZnO/Al2O3. Not only do solve the problems faced by hydrogen energy, but it reduces greenhouse gas emission. The category of catalyst will affect the reaction, the operating parameter is also related to ecomomic costs, energy consumption and catalysis performance. Therefore, this study mainly focuses on the optimization of operating parameters. It’s divided into four parts: single variable discussion, Response Surface Methodology(RSM) analyze, reactant composition adjustment and the affect of pressure.
Using single variable discussion, it was found the reaction temperature and volumn flow ratio of H2/CO were significant factors. The greatest methanol yield was obtained by RSM when the reaction temperature was 215℃and volumn flow ratio of H2/CO was 2.5. Then, by adjusting volumn flow ratio of H2/CO/CO2, it was observed Cu/ZnO/Al2O3 is more suitable for hydrogenation of carbon monoxide, but adding carbon dioxide to the reactant has increased the yield. Finally, by increasing the reaction pressure, the methanol yield is obviously increased by 7-8 times. The effect of H2 volumn flow ratio becomes less in the yield at higher pressure condition. It will be used to consider to set hydrogenation equipment in the future.

並列關鍵字

commerial catalyst Cu/ZnO/Al2O3 ； biomethanol

參考文獻

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