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Biodiesel (Biodiesel) refers to oil crops, wild oil plants and other aquatic plants and engineering microalgae oils and animal fats , food waste oil as raw oil , made ??by the transesterification process can replace fossil diesel renewable diesel fuel . Biodiesel as an alternative to diesel fuel quality , is environment-friendly green fuel , has far-reaching economic and social benefits . Based on the comprehensive literature based on the use of soybean oil as biodiesel feedstock , emphasis on the solid catalyst for biodiesel yield and the separation process. Firstly, the research at the normal temperature and pressure conditions, the nine kinds of catalysts ( sodium hydroxide, potassium hydroxide, sodium hydroxide, calcium oxide , magnesium oxide, attapulgite , dolomite , egg shells ) of ester exchange biodiesel catalysis . And selecting two kinds of homogeneous catalysts ( sodium hydroxide, potassium hydroxide) , and better catalytic heterogeneous catalyst ( calcium hydroxide , dolomite ) comprehensive study of methanol to oil molar ratio, reaction time, reaction temperature, catalyst dosage and catalyst particle size on biodiesel yield and the yield of glycerol . Secondly, the study of high temperature and pressure , the seven kinds of catalyst ( calcium hydroxide , calcium oxide , magnesium oxide, attapulgite A, attapulgite C, attapulgite D, dolomite ) for biodiesel transesterification catalyst . The results show that , compared with and without catalyst , seven kinds of biodiesel catalysts showed some catalyst. Finally, the study of the combustion characteristics of biodiesel , calculate the kinetic parameters of the combustion process ( activation energy and pre-exponential factor ) as well as different temperature ranges mechanism functions . Through the two homogeneous catalyst ( sodium hydroxide, potassium hydroxide ) and two types of heterogeneous catalysts ( calcium hydroxide , dolomite ) biodiesel production process of each factor influencing the design of the orthogonal test synthesis process , the results showed that the catalysts of the best yield of biodiesel obtained were : 90.1% , 92.5% , 70.21% , 77.36% ; purification separation of two homogeneous catalyst yield of biodiesel obtained were: 77.3% , 76.1% .
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