| With the aggravation of the energy crisis, biodiesel has been attracting more attention from the world as an environmental friendly alternative fuel. Biodiesel was produced from methanol and oil catalyzed by acid/base or lipase, but mass transfer was one of the key problems due to the insolubility of methanol and oil. Generally the production of biodiesel was carried out in a stirred reactor through a batch mode and the productivity was relatively low. Microcapillary reactor was a new type of rector with enhanced mass transfer and heat transfer, and has been applied in the study of biodiesel synthesis. In this thesis the microcapillary reactor with a combination of micromixer and microreactor was studied in continuous production of biodiesel.In the article, we first analyzed the properties of soybean oil and determined the analysis method using GC. Then we compared the capacity of traditional homogeneous catalysts and heterogeneous catalysts in producing biodiesel in batch reactor, results showed that transesterification yield could reach 90.67%using KOH at appropriate conditions.Next, we adopted PTFE microcapillary (l=1.5m,(?)=0.75mm) as reactor, T-type micro mixer was used to mix soybean oil and methanol. Respectively, in micro reaction system we investigated the effects of residence time, reaction temperature, molar ratio and catalyst concentration on biodiesel yields. And designed RSM experiments to investigate the interaction among different factors, optimized the reaction conditions. The rsult showed that the optimal yield was 94.21%.Finally, we prepared and characterized three kinds of acid ionic liquids and two kinds of basic ionic liquids, testing the catalystical capacity in biodiesel production from soybean oil. The results showed that the imidazole ionic liquids [C4SO3Hmim]HSO4 and the basic ionic [mim]2C4Im2 performed best as catalysts, the transesterification yields reached 68.32% and 21.06% respectively. But they did not make good performancel in microcapillar y. |
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