Effectiveness of Eggshells as Natural Heterogeneous Catalysts for Transesterification of Rapeseed Oil with Methanol

Heterogeneous catalysis has an advantage of easy separation the catalyst after biodiesel is produced. CaO known to be efficient heterogeneous for production. Taking into account that a key component eggshells, effectiveness eggshells as rapeseed oil transesterification with methanol was investigated and optimal conditions production were determined applying RSM methodology. The influence three independent variables on ester content analyzed quadratic model created. It this statistically significant. optimum when are used catalyst, process temperature 64 °C, as: methanol-to-oil molar ratio 10.93:1; amount 6.80 wt%; reaction duration 9.48 h. yield 97.79 wt% obtained under these conditions.