| 摘要 |
Provided is a process for obtaining higher fatty acid alkyl esters by subjecting glycerides of fats and oils to transesterification with a monovalent lower aliphatic alcohol, in order to obtain a substitute diesel fuel that can serve as a fuel for diesel engines and the like, and particularly, this process is intended to effectively remove free fatty acids contained in fats and oils. Before raw material fats and oils are supplied to a transesterification reaction, the raw material fats and oils are first treated with a monovalent lower aliphatic alcohol using an alkali metal hydrogen sulfate as a catalyst, free fatty acids are esterified, and then, the resultant is supplied to the transesterification reaction. |
