| Summary: | 碩士 === 大同大學 === 化學工程學系(所) === 99 === The etherification of glycerol with methanol on solid acid catalysts provides a way to transform glycerol into a value added product to be used as an oxygenated additive to diesel fuels. Different types of acidic heterogeneous catalysts, including sulfonic resins, zeolites and sulfonated carbon catalyst are used for the synthesis of mono-, di- and tri- ethers of glycerol using methanol as the alcohol. The study shows that the performances of the catalysts are governed by both the acidity and the polarity of their surface. Among the testing catalysts, the sulfonated carbon catalyst (H-SR) attains a suitable average pore size, acid capacity, and adsorption capability of glycerol due to polarity of the surface forms the H-SR catalyst. With a 4:1 molar ratio of methanol to glycerol, a 1:10 weight ratio of catalysts to glycerol, a reaction temperature of 503 K at the reaction time of 24 hours, the conversion of glycerol (89%) and a combined yield of GDMEs and GTME of 46% are achieved for a batch operation. To achieve the target product of GDMEs and GTME mixture as a new oxygenate additive for diesels, one should improve the capability of the prepared catalyst as well as develop a more efficient green process and separation.
|
|---|
