| Summary: | 碩士 === 大同大學 === 化學工程學系(所) === 98 === This is the age that the amount of oil contains gradually reducing. Because the effect of carbon dioxide for the greenhouse effect. How to find biofuel to replace oil is currently an important issue. Agricultural waste can be used as a raw material, which will not compete with foods. The experiment is based on different acids (sulfuric acid, carbonic acid and phosphoric acid) reacts with the sugar molecules have greater activity in the methylation reagents, with different reagents (DMS, DMC, TMP) to facilitate the generation of ether reaction, the glycerol and sugars transfer to the hydrophobic compounds, and different mass (1-time to 5-times) and reaction time (1 hour, 2 hours, 4 hours, 8 hours, 12 hours) to find optimum results.
According to Haworth’s methods, we set the reaction conditions of 90℃, the glycerol can be converted to 3ME1 (3-Methoxy-1,2-propanediol; 2-Methoxy-1,3-propanediol), 3ME2 (2,3-Dimethoxy-1-propanol; 1,3-Dimethoxy-2-propanol), 3ME3 (1,2,3-Trimethoxypropane) and analysis by GC. DMS as methylation reagent to react in an hour the selectivity and yield rate had become better and greater. However, TMP reagent need to increase the reaction time to 4 hours will had the 30% yield. DMC as the reagent had better react with glycerol to formation the ring structure.
Glucose as raw material, DMS had the better yield and conversion rate to formation 6ME1 (Mono-O-Methylglucose), 6ME2 (Di-O-methylglucose), 6ME3 (Tri-O-methylglucose), 6ME4 (Tetra-O-methylglucose) and 6ME5 (Penta-O-methylglucose), and TMP second, DMC less. But DMC is an organic compounds, it would not damage the engine even if DMC was not reacting completely.
According to the historical literatures, if we use the Me-Glu (6ME1) as reactants, it will make the etherification reaction better then glucose.
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