Method and system for extracting and separating natural VE from plant oil deodorizing distillate

Abstract

The invention provides a method and a system for extracting and separating natural VE from plant oil deodorizing distillate. The method comprises the following steps of: carrying out saponification and acidifying reaction to convert glyceride, sterol ester and the like in the deodorizing distillate into free fatty acid, glycerin and sterol; carrying out low temperature crystallization and separation on sterol; carrying out methyl esterification action by taking a strong acid type ion exchange resin as a catalyst; and replacing the molecule distillation and vacuum distillation equipment by using vacuum rectifying tower equipment. The invention has the advantages that the return function of the rectifying section is increased; the effect of multi-stage separation can be achieved by one-pass operation; high-quality fatty acid methyl product and high-concentration purity VE product at the tower bottom can be obtained; and the VE recovering rate in the rectifying process reaches more than 90%.

Description

technical field [0001] The invention proposes a method and system for extracting and separating natural VE from vegetable oil deodorization distillates. Background technique [0002] Natural VE has attracted people's attention due to its antioxidant and physiological functions, and is mainly used in medicine, food, cosmetics, feed and plastics and other industries. Soapstock and deodorized distillates produced in the refining process of vegetable oils are important raw materials for the production of natural VE by domestic and foreign enterprises. [0003] The main components of the deodorized distillate are: free fatty acids, glycerides, sterols and sterol esters, VE, hydrocarbons and a small amount of ketones, aldehydes, carbohydrates, etc. Extraction of natural VE from deodorized distillate usually adopts extraction, molecular distillation, vacuum distillation, adsorption, chromatography and other methods. The application of extraction technology to extract natural VE r...

AI Technical Summary

Problems solved by technology

However, the molecular distillation equipment is expensive, which increases the production cost

[0004] Apply vacuum distillation technology to extract natural VE, first remove fatty acid or fatty acid methyl ester by distillation, then collect fractions of different temperature sections under a certain vacuum, control the appropriate temperature to obtain VE concentrate, due to the difference in system pressure, such temperature The segment is not easy to control, and the yield of the resulting product is not very high

CN1037769C uses alcoholysis reaction to convert neutral oil into fatty acid methyl ester, the primary distillation steams fatty acid methyl ester under 20-40Pa absolute pressure, and the secondary distillation is carried out under 10-20Pa absolute pressure, and it is collected at 240-280°C The intermediate fractions are VE products, but the yield is only 40% to 50%. This is mainly because the multi-stage operation increases the heating time of the components in the high-temperature tower kettle, which leads to the intensification of VE decomposition.

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