https://scholars.lib.ntu.edu.tw/handle/123456789/65929
Title: | 溫合條件下液相氫化應用於糠醇轉化至四氫糠醇 Liquid-phase Hydrogenation of Furfuryl Alcohol to Tetrahydrofurfuryl Alcohol under Mild Conditions |
Authors: | 鄭偉安 Zulfan, Rusdy |
Keywords: | 糠醇;四氫糠醇;氫化;硼?化?;?气;FFA;THFA;hydrogenation;NaBH4;H2 | Issue Date: | 2015 | Abstract: | 現今能源與環境議題日益漸增,在許多場合都被頻繁討論,人類毫無節制地使用石化燃料,不僅影響環境生態,更是漸漸將現代社會推向危險邊緣。而由纖維素轉換得到的生質能被科學家宣稱是解決這個問題的良藥,可作為未來替代石化燃料的綠色能源。 我們需要發展更進一步的程序得到木質纖維素的衍生物,氫化反應就是其中之一。經由糠醇 (furfuryl alcohol ,FFA)進行氫化反應可以得到的四氫糠醇 (Tetrahydrofurfuryl alcohol , THFA),被認為是農業上的「綠色溶劑」,也是可作為其他有用的化學物質之前驅物。此氫化反應通常要在高壓且100 °C以上的條件下進行,本研究則是利用硼氫化鈉作為氫氣來源,在液相且溫和的條件下 (室溫, 1 atm) 即可反應。我們已也在氣相進行反應,並且將最適條件下的結果與液相比較。銠金屬(rhodium, Rh) 附載於碳材上的商業觸媒可作為氫氣的載體,促進本氫化反應的進行。 在硼氫化鈉作為氫氣來源的系統下,此反應可在2小時內糠醇 (FFA)轉化率達到100%,並四氫糠醇 (THFA)的產率達到79% 。利用氫氣氣體進行氫化反應則可以於50 °C的條件下,在11小時糠醇(FFA)轉化率達到 94%,四氫糠醇 (THFA)的產率則是達到93%。在液相反應的選擇性相對雖然比較差,在常溫下進行反應仍是優勢,另外儀器設置簡易可以降低工業生產的成本,使此程序更具價值。或許可以成為往後進行其他的氫化反應的另一種選擇。 Nowadays, energy and environmental issues become more intense and prevalent to be discussed in most occasions. Uncontrolled utility of fossil fuel without any awareness to environmental impacts, certainly endangers our modern civilization. Lignocellulosicderived biomass is claimed by scientists as green-based-energy alternative to replace the fossil fuel soon or later. Further processes need to be performed to make chemicals-derived-lignocellulosic ready to be utilized, and hydrogenation is one of them. Tetrahydrofurfuryl alcohol (THFA) is one of hydrogenation’s products originated from furfuryl alcohol (FFA) which has been regarded as ―green‖ solvent in agriculture sector and precursor for another useful chemicals. Hydrogenation usually is performed under high pressure (above 10 bar) and above 100°C. Author initiated to carry on liquid-phase hydrogenation under open system and 30˚C using NaBH4 as hydrogen-generator. Gasphase hydrogenation had also been performed under certain condition, and its optimum results were used to compare to previous optimum results. Commercial catalyst rhodium embedded on carbon was chosen to carry hydrogenation. System using NaBH4 could achieve 100% conversion of FFA and 79% yield towards THFA at 30˚C for 2 hours reaction. System using H2 gas could convert 94% of FFA and 93% yield towards THFA at 50°C for 11 hours reaction. Despite of selectivity factor, NaBH4 system still achieved high yield, and not forget to mention room temperature reaction, and simple apparatus preparation became value-added. Hydrogenation using NaBH4 could become one option to be considered. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/271887 | Rights: | 論文公開時間: 2016/2/15 論文使用權限: 同意無償授權 |
Appears in Collections: | 化學工程學系 |
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ntu-104-R02524100-1.pdf | 23.54 kB | Adobe PDF | View/Open |
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