Synthesis of Rosin Methyl Ester Using SBA-15-HSO3-AMS+HSO4- as Mesoporous Catalyst

SBA-15-HSO3-AMS+HSO4- was prepared by grafting functional ionic liquidsHSO3-AMS+HSO4- with the mesoporous molecular sieve SBA-15. The material was characterized by XRD, IR and Py-IR . The result shows that SBA-15-HSO3-AMS+HSO4- is of the similar long-range structure as SBA-15, and there are many acid centers including B acid and L acid in SBA-15-HSO3-AMS+HSO4-. This catalyst was used for synthesizing rosin methyl ester using rosin and methanol as starting materials. The effects of reaction temperature, reaction time, dosage of catalyst and molar ratio of acid to methanol are researched. The optimum condition is:n(rison):n(methanol)1:30, 200℃, 5 h, m(catalyst):m(rison)6:100. Under the optimum conditions, the esterification yield was 97.2%. Additionally, the catalyst was of excellent reusability.