利用不同選擇比之吸附劑分離純化發酵液中正丁醇

Separation and Purification of n-Butanol from the Fermentation Broth by using adsorbent with different Selectivity

洪國勛(Guo-Xun Hong)

指導教授 ： 鍾財王

中原大學/工學院/化學工程研究所/碩士(2017年)

https://doi.org/10.6840/cycu201700165

摘要

自從工業革命以來，人類使用大量化石燃料，隨著化石燃料儲存量減少，二氧化碳排放量增加，全球暖化日益嚴重，發展生質能是現今能源發展重要的課題，以利達到地球永續發展。近年來，隨著近無碳損纖維素生質丁醇生產技術日益成熟，生質丁醇勢必成為良好的生質能源，生質丁醇比生質酒精能多產25%的能量且丁醇與水不互溶可減少油品相分離等問題，性質上比酒精更接近汽油，可添加更多比例進入汽油。然而，發酵液中丁醇產率過低，且傳統蒸餾分離純化技術十分耗能，突顯出分離純化技術的重要。本研究利用節能的多段吸附分離純化技術且吸附劑可以重複利用，是個有潛力的分離技術。本實驗先利用不同矽鋁比的沸石ZSM-5(Zeolite Socony Mobil-5)從發酵液中吸附丁醇，實驗結果可以知道高矽鋁比ZSM-5沸石具有高的丁醇吸附量，但由於ZSM-5不只會吸附丁醇也會吸附少量的乙醇和丙酮。因此，實驗最後利用SAPO-34吸附劑具有可吸附乙醇與丙酮，不太吸附丁醇的特性來提高丁醇純度。本研究發現SAPO-34吸附劑在操作時間3小時吸附乙醇與丙酮具有最高的選擇比。本研究提出的多段吸附方法，產物中正丁醇的純度可高達99.52wt%。

關鍵字

丁醇 ； 吸附 ； 沸石 ； ZSM-5 ； SAPO-34 ； 選擇比 ； 純度

並列摘要

Since the industrial revolution, human beings have consumed a lot of fossil fuels. Along with the reduction of fossil fuel storage and the surge of carbon dioxide emissions, global warming is worsening. Therefore, developing the biomass energy is an important issue for energy development in order to reach the sustainable development of the planet. In recent years, with the maturity in Carbon Neutral Cellulosic Butanol Production Technology, bio-butanol is bound to be a good biomass energy. Compared to bio-ethanol, bio-butanol can generate more than 25% of energy. Furthermore, bio-butanol and water is immiscible thanks to the character of bio-butanol being closer to oil and allowing more addition into oil, contributing to the decrease the problem of oil skimming. However, the low production rate of butanol in fermentation and the extremely energy-consuming skill in the traditional distillation separation purity, highlight the importance of distillation separation purity technology. This research used the energy-saving technology of adsorption separation to purity and adsorbent can reusable, which is a high potential of separation technology. In this experiment the zeolite called ZSM-5(Zeolite Socony Mobil-5) is used. ZSM-5 of different silica-aluminum ratio is used to adsorb butanol in fermentation broth. The result showed that ZSM-5 with high silica-aluminum ratio can adsorb more butanol. However, since ZSM-5 not only adsorbs butanol, but also adsorbs a little amount of ethanol and acetone. As a result, the experiment takes the advantage of the characters of the SAPO-34 adsorbent to adsorb ethanol and acetone to increase the purity of butanol. The research discovered that SAPO-34 created the highest selectivity of ethanol and acetone in the operation time of three hours. Through the method used in the research, the purity of n-butanol in the production can reach up to 98.52wt%.

並列關鍵字

Butanol ； Adsorption ； Zeolite ； ZSM-5 ； SAPO-34 ； Selectivity ； Purity

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