Preparation of Fe3O4@SiO2–ZnO catalyst and its catalytic synthesis of rosin glycol ester

In order to solve the problems of low recovery, low availability, and high cost in the synthesis of rosin glycol ester, a series of supported ZnO magnetic catalysts were prepared with Fe as the magnetic center, and their structures and compositions were characterized by TEM, XRD, and XPS. Through screening, the results show that Fe @SiO –ZnO has the best catalytic effect, far better than other catalysts, and has good stability. At the same time, the effects of zinc source and its load and different reaction conditions on the synthesis of rosin glycol ester were also investigated. The results showed that: When zinc chloride was used as zinc source, theoretical loading of zinc source was 0.45 g, reaction temperature was 270°C, reaction time was 5 h, and catalyst dosage was 0.2 g, the esterification rate of rosin-glyceryl ester was 87.2% and acid value was 26.5 mg KOH g In our paper, the optimal process conditions for rosin glyceride were obtained as follows: zinc acetate is the zinc source, the theoretical load of zinc source is 0.25 g, the reaction temperature is 240°C, the reaction time is 5 h, and the amount of catalyst is 0.2 g. The esterification rate was 81.5%, and the acid value was 38.2 mg KOH g . The catalytic activity of the catalyst remained basically unchanged after 5 times use, indicating that it has good stability, and an available catalyst was added for the rosin esterification reaction.