Method for preparing diglyceride through industrial molecular distillation and reducing 3-chloropropanol ester in diglyceride

Abstract

The invention relates to a method for preparing diglyceride through industrial molecular distillation and reducing 3-chloropropanol ester in diglyceride. The method comprises the following main steps: subjecting palm oil, cottonseed oil or vegetable fat to enzymatic glycerolysis so as to obtain diglyceride-rich mixed lipid which is used as a raw material, continuously conveying the raw material to a deaerator via a feed pump and removing air carried by the raw material; heating the degassed raw material to 135 to 160 DEG C, allowing the heated raw material to enter a film evaporator, adjusting the rotating speed of the film evaporator to 150 to 180 r/min and absolute pressure to be 1 mbar or so, and separating out lower-boiling-point components in the raw material; and adjusting the temperature of a heating medium to 230 to 280 DEG C, heating the raw material to 180 to 215 DEG C, uniformly pumping the raw material into a scraped-film type short-path distiller, adjusting the rotating speed of the scraped-film type short-path distiller to 220 to 300 r/min and absolute pressure to be 0.001 to 0.1 mbar or so, and collecting separated light-phase and heavy phase components. In industrial molecular distillation for preparation of a diglyceride product, the flow of the raw material is controlled to be 15 to 25 L/h; and the obtained diglyceride product with purity of 80% or more has to undergo molecular distillation twice.

Description

technical field [0001] The invention belongs to the preparation of diglyceride and the safety of the product in the technical field of functional edible oil production, and specifically relates to the preparation of diglyceride products by industrial molecular distillation and the reduction of 3- methods for potential risk factors such as chloropropanol or glycidyl esters. This method is suitable for the continuous industrial production of high-quality diglyceride products, and removes potential risk factors such as 3-chloropropanol ester or glycidyl ester that may exist in the diglyceride to the limit required by food safety to ensure that the diglyceride All physical and chemical indicators meet the relevant standards, the production method is green and pollution-free, and the process technology is continuous and automatic. Background technique [0002] Due to the continuous improvement of people's quality of life and unhealthy living habits, some rich and noble diseases ...

AI Technical Summary

Problems solved by technology

Chloride ions are not easy to enter the hydrophobic environment of oil by nature, but in the presence of amino acid salts, phosphorus-containing compounds and surface active substances such as monoglycerides and diglycerides, the ability of chloride ions to chlorinate glycerin is greatly enhanced

Since there is a hydroxyl group in the molecular structure of diglycerides, if there are chloride ions in the system during the preparation and processing, the products of diglycerides are more likely to have the risk of producing 3-chloropropanol esters