- 學位論文
研究固態酸性觸媒對甘油與正丁醇之反應合成含氧添加劑
Study of Solid acid catalysts for glycerol reacted with n-butanol to synthesize oxygenated additive
摘要
自從世界對生質柴油產業之可再生能源需求不斷增加，副產物甘油的過量生產正式成為值得關注的問題。甘油和醇經過醚化反應合成甘油烷基醚在學術研究與工業議題上是項活躍的研究領域，尋找潛在的催化劑與最佳工業參數條件的可能性。在本研究中，使用二種催化劑硫酸鋁和三氟甲基磺酸鉍進行甘油醚化反應在批次式反應器下探討，透過使用正丁醇生產含氧添加劑。詳細反應條件研究包括：醚化反應之參數，如催化劑使用量（反應物總量0.01-20wt%），甘油/正丁醇的莫爾比(1：2-1：6)，反應溫度(230-270℃)和反應時間(2-7h)。結果顯示甘油的轉化率(>92%)可以在溫度(230-270℃)的溫度範圍內觀察到。反應在溫和的操作壓力(7-26 kg/cm2)下進行。甘油生產主要產品為單丁基甘油醚(ME)，二丁基甘油醚(DE)，三丁基甘油醚(TE)。在反應後之產物混合物在室溫下透過冷卻過程使其自動分離成油相與水相溶液。並將產物油相透過簡單的熱重分析儀分析汽油與柴油的組成並定為辛烷值添加劑。透過氣相層析儀(GC)與熱重分析法(TG)來分析油相產物的組成。本研究也將討論觸媒的再循環性。
並列摘要
Since the world’s growing demand for renewable energy in biodiesel industry, overproduction of glycerol is becoming an issue of concern. Etherification of glycerol with alcohol to synthesize the alkyl ethers of glycerol is an active research area of academic and industrial issues to explore the possibility to identify the potential catalysts and optimize the process parameter. In this work, the catalytic etherification of glycerol has been investigated with two kinds of catalyst, Aluminum Sulfate and bismuth(III) trifluoromethanesulfonate, in a batch reactor by using n-butanol to produce oxygenated additives. A detailed study of the reaction conditions includes catalyst loading (0.01-20 wt % total amount of reactants), molar ratio of glycerol/n-butanol (1: 2 to 1: 6), reaction temperature (230-270℃), and reaction time (2-7 h). The results indicate that the high conversion (>92%) of glycerol can be observed at the temperature ranges (230-270℃) and operating pressure (7-25atm). The glycerol products towards mono-butyl-glycerol ether (ME), di-butyl-glycerol ether (DE), and tri-butyl-glycerol ether (TE). After the reaction, the product mixture was automatically separated into an organic phase and an aqueous phase through the cooling process at room temperature overnight. Furthermore, the components in the organic phase can be tailored to an octane booster for gasoline and a diesel-like fuel by a simple distillation. The composition of oil phase products are analyzed by gas chromatography (GC) and thermogravimetric (TG) methods. The recyclability of catalyst are also discussed in this work.