Synthesis of Sucrose Ester of Rosin Acid Catalyzed by K2O/Al2O3 and Na3PO4/MgO Solid Base

The sucrose ester of rosin acid was prepared with K2O/Al2O3 and Na3PO4/MgO solid base catalyst in the solvent of 1,2-propanediol. The effects of reaction temperature, catalyst loading amount, reaction time and mass ratio of rosin to sucrose on the synthesis of sucrose ester of rosin acid were discussed with esterification rate as index. The catalyst was characterized by SEM, BET and other methods, and the performances of emulsification, foaming and surface tension of sucrose ester of rosin acid were tested. Tests revealed that the specific surface areas of K2O/Al2O3 and Na3PO4/MgO were 142.52 and 19.38m2/g. In the synthesis reaction of sucrose esters of rosin acid, the activity of catalyst K2O/Al2O3 was higher than that of Na3PO4/MgO. The optimum synthesis conditions of the sucrose ester of rosin acid with K2O/Al2O3 as catalyst were the reaction time 2.5h, reaction temperature 125℃, amount of catalyst K2O/Al2O3 3%, the mass fraction of K2O in K2O/Al2O3 30%, the mass ratio of rosin and sucrose 1:2. The esterified rate mounted to 98% under the above optimum conditions. In the comparative study it was found that the sucrose ester of rosin acid exhibited stronger surface activity than sucrose fatty acid ester.