| abstract |
(57) [Problem] To provide a solid acid catalyst for carboxylic acid esterification which can be easily esterified simply by adding it to a carboxylic acid and an alcohol, can be recovered after the esterification and can be used repeatedly, and The present invention provides a heterogeneous carboxylic acid esterification method with a high yield. The solid acid catalyst for carboxylic acid esterification is obtained by exchanging metal cations existing between layers of montmorillonite having a layer structure with Ti 4+ . In the heterogeneous carboxylic esterification method, the solid acid catalyst for carboxylic acid esterification, carboxylic acid and alcohol are mixed and stirred, and then the acid catalyst is filtered off. |