| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程系 === 105 === Calcium oxide as catalyst derived from eggshell shell is more and more popular in the transesterification of oil with methanol due to its low solubility in methanol, high alkalinity and reusability which conform to environmentally-friendly process. Calcium methoxide and calcium diglyceroxide are produced naturally in the transesterification process by using calcium oxide as the catalyst. This study aimed to understand the relationship of all reactants and products involved, thereby, to provide information to improve the process when calcium oxide is used as the catalyst for biodiesel production. In this study, three periods namely induction period, rapid reaction period, and equilibrium period, were observed in the rate-time curve when CaO was used as catalyst for transesterification of new soybean oil. Furthermore, activation of the CaO catalyst by preheating it with methanol for 15 min could significantly shorten the reaction time from 2.25 h to 1.5 h and resulted in 92.53% of FAME content. It was also found that Ca-G could be partially dissolved in methanol and could act as a homogeneous catalyst to accelerate reaction rate. Several kinds of catalysts were used in the metholysis of waste cooking oil inluding CaO, Ca-G, Ca-M, Ca-soap and spent catalyst collected from the transesterification of new soybean oil. The result showed that Ca-G, Ca-M and spent catalyst could be used as catalyst in the transesterification process of waste cooking oil.
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