As a natural component of oil, diglyceride is also an intermediate product of oil metabolism. It has the advantages of safety, nutrition, good processability and high human compatibility. It is a multifunctional additive, widely used in food, medicine, chemical industry (cosmetics) and other industries.
The diglyceride oil with nutrition and health care function made from ordinary oil has recently become one of the main directions of oil development and the focus of development of major oil companies. The relevant domestic departments have listed diglyceride as a new product recommended for key development.
Industrial production factors of continuous and efficient DAG;
The industrialized production of DAG needs continuous and effective production methods. Among them, the most important factors mainly include three aspects:
1) The choice of immobilized lipase is the key factor to determine the production efficiency of DAG. Immobilized lipase can be reused, reducing the cost of lipase; The enzyme concentration in the reaction system is high, the reaction speed is fast and the period is short; The specificity of the enzyme is strong, the side effect is small, and the purification cost is reduced.
2) Immobilized enzyme reactor: In order to realize the industrial production of DAG, the intermittent stirring reactor is not suitable, because the immobilized enzyme can not be loaded into this reactor at high density, and the shear force generated by stirring is easy to denature and inactivate the enzyme protein shedding carrier. Packed bed (fixed bed) reactor is suitable for long-term continuous industrial operation and can realize the maximum utilization of immobilized enzyme.
3) Separation and extraction methods: There are four reported purification methods of glyceride: solvent crystallization separation, column chromatography separation and supercritical CO2? Extraction, molecular distillation. Through analysis and comparison, molecular distillation can provide an efficient purification method for industrial production of DAG.