Selection and Preparation of Basic Catalysts for Biodiesel Production

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　　Biodiesel is produced in the laboratory by carrying out an esterification reaction between vegetable oil and methanol under the catalysis of a base, resulting in methyl fatty acid esters and glycerol. The process sounds simple, and it is indeed simple in practice. The catalysts used are sodium hydroxide and potassium hydroxide. According to the available information and data collected, both bases are suitable. But in our actual experiments. It was found that when sodium hydroxide was used as a catalyst, the resulting methyl ester was relatively cloudy, with white substances present in it. Using potassium hydroxide as a catalyst, it is possible to obtain a methyl ester that is completely transparent like water. 　　I’ve tried many experiments, but I still can’t figure out what the problem is; I’m seeking advice from everyone.