P13 CaO触媒を用いたバイオディーゼル燃料の合成における超音波の応用

抄録

In recent years, many countries around the world have the energy and environmental problems such as the depletion of fossil fuels and the increase of green house gas including CO_2. To settle the problems, the use of biodiesel fuel that is one of biofuels should be useful, since the biodiesel fuel has features of carbon neutral and renewable energy, etc. Generally, fatty acid methyl ester (FAME) that is constituents of the biodiesel fuel is synthesized by using alkali hydroxide that is a homogeneous catalyst. However, it costs a lot of money to removal of the catalyst and to wash the product in this method. The use of a heterogeneous catalyst such as CaO for synthesis of FAME can solve the problems because it is easier to separate it from the solution after reaction. However, the synthesis rate of FAME using a heterogeneous catalyst decreases compared with that using a homogeneous catalyst. In this study, an attempt was made to synthesize the biodiesel fuel using a CaO catalyst under the ultrasonic irradiation. We compared the formation behavior of the biodiesel fuel under sonication with that under the mechanical stirring. In addition, the effect of the ultrasonic power on the reaction rate was investigated.