Catalytical Esterification of Carboxylic Acid Over Ti-β Zeolite Catalyst

The catalytic synthesis of both propyl acetateand propyl propionate has been studied using Tiβ zeolite as catalyst.The effects of the activation temperature of the catalysts,reaction time,the molar ratio of carboxylic acid(acetic acid or propionic acid) to npropanol,the amount of the catalyst used,the amount of cyclohexano used,and reaction temperature,on the esterification reactions were investigated.The appropriate reaction conditions for the catalytic synthesis of propyl propionate in the presence of Tiβ zeolite were found to be as follows:a reaction temperature of 110 ℃,the amount of the cat-alyst used=4.0 g/mol propionic acid,the molar ratio of carboxylic acid to alcohol=1:1.1,the amount of cyclohexane used=200 mL/mol propionic acid,and reaction time=3 h.The best conversion of propionic acid obtained under the appropriate reaction conditions was 78.4%.