| In order to prepare oil rich in 1, 3-diacylglycerols (1,3-DAG) , using soybean oil and glycerol as raw materials, 1,3-DAG was prepared by low-temperature chemical glycerolysis. The effects of solvent type, solvent dosage, catalyst type, catalyst dosage, reaction time and reaction temperature on product composition were investigated by single factor experiment to optimize the process conditions. The scale-up experiment was conducted under the optimal conditions. The results showed that the optimal conditions of preparing 1,3-DAG by low-temperature chemical glycerolysis were obtained as follows: with acetone as solvent, mass ratio of solvent to reactant 2∶ 1 , with sodium methoxide as catalyst, catalyst dosage 0.6%(based on reactant mass), reaction temperature 50 ℃, and reaction time 3 h. Under these conditions, the content of TAG in the product was 44.03%, and the content of DAG was 43.97%, with the content of 1,2-DAG 13.53%, and the content of 1,3-DAG 30.44%. Increasing the dosage of reactants by 10 times, the TAG content was 46.35% and the 1,3-DAG content was 29.13%. In conclusion, with soybean oil as raw material, diglyceride oil rich in 1,3-DAG can be obtained by low-temperature chemical glycerolysis, and this method has the potential to be applied to large-scale production of 1,3-DAG. |
