Preparation process of edible oil diglyceride

Abstract

The invention relates to a preparation process of edible oil diglyceride. The preparation process comprises the following steps of (1) carrying out saponification reaction by using edible oil as a raw material to obtain liquid soap; (2) adding excessive sulfuric acid or phosphoric acid into the liquid soap, and carrying out acidification reaction to obtain crude fatty acid liquid; (3) adding water into the crude fatty acid liquid for washing, standing after washing, and separating fatty acid on the upper layer from water on the lower layer; (4) performing vacuum drying on fatty acid; (5) uniformly mixing fatty acid and glycerol according to a molar ratio of 1.5: 1 to 2.5: 1 to obtain a first mixed material; then adding the first mixed material into an immobilized enzyme column, and reacting for 2-4 hours under the condition that the temperature is 50-55 DEG C; and (6) carrying out molecular distillation on the reaction product in the step (5) by adopting a molecular distillation device to obtain a heavy component which is the required edible oil diglyceride. The diglyceride is obtained by adopting a direct esterification method, the raw materials are easy to obtain, the production cost is relatively low, the product yield is high, and the product purity is high.

Description

technical field [0001] The invention relates to the technical field of oil modification, in particular to a preparation process of edible oil diglyceride. Background technique [0002] Diacylglycerol (also known as diglyceride) is the esterification product of glycerol and two fatty acids. Diacylglycerol is a natural component of animal and vegetable oils, but its content is generally low. The content of diacylglycerol in different oils is different, usually between 4-8%. Therefore, high-content glycerol is generally obtained by chemical methods or biological enzyme methods diester. Due to its different metabolic pathway from triglyceride, diacylglycerol has special physiological functions, which can reduce fat accumulation, reduce obesity, and reduce postprandial blood lipid content, so as to prevent and treat hyperlipidemia, hypertension, cardiovascular and cerebrovascular diseases, etc. Diacylglycerides can provide the body with the required fatty acids and energy, and ...

AI Technical Summary

Problems solved by technology

[0011] Partial glyceride lipase can catalyze the esterification of fatty acids and glycerol, and the obtained products only contain fatty acids, monoglycerides and diglycerides, and there will be no triglycerides. Ideal catalyst, but partial glyceride lipase is difficult to obtain. At present, most partial glyceride lipases are in the laboratory stage and cannot be commercialized. Only lipase Lipase "Amano" G50 of Amano Enzyme Products Group in Japan has a small amount of supply, which is expensive. caused a substantial increase in production costs