| 摘要 |
PROBLEM TO BE SOLVED: To very efficiently produce a high-quality ester from a fatty acid and an alcohol by preparing a heterogeneous system catalyst which contains aluminum orthophosphate, and has a specified volume of pores of a specified diameter and a specific amount of an acid. SOLUTION: This heterogeneous system catalyst which is used for esterification reaction of a fatty acid and an alcohol is prepared in such a way that aluminum orthophosphate is contained and that a pore is 6-100 nm in diameter and 0.46 ml or more in volume and that acid volume is 0.40 mmol/g or more. A method for preparing the catalyst is preferably sedimentation which is performed by dropping an alkali such as an ammonia solution to an aqueous solution of aluminum salt mixed with orthophosphoric acid, and the desired catalyst is obtained in such a manner that the resulting sediment is treated by filtering, washing with wafer, drying, baking, and the like thereof. The composition of the catalyst is preferably within a range of 1:3-1:0.1 of the atomic ratio of aluminum atom to phosphorus atom. |
