A kind of circulation gas stripping distillation method for extracting EPA&DHA from fish oil

Abstract

The invention relates to a circulation gas extractive rectification technology for extracting EPA and DHA from fish oil. The method is characterized in that the fish oil is pre-heat, is introduced into a rectifying tower and rectified under extractive rectification of inert gas circulation gas to obtain a mixture of EPA and DHA. The method employs light component of the inert gas circulation gas, and employs a backflow mode for high purity separating of the components, rectification and gas stripping are fusion during a whole process, the difference of the components volatility in the fish oil can be used, so that multitime partial vaporization and partial condensation can be carried out, the light component of the hot inert gas is used, partial pressure of the light component is reduced, the light component is developed to vaporization, and the light component content in a heavy phase is reduced. In the invention, high vacuum is not required, one time purification can be used for increasing the EPA and DHA content to more than 70%.

Description

Technical field [0001] The present invention relates to the technical field of separation and purification of fish oil, in particular to a method for purifying EPA&DHA in fish oil. Background technique [0002] Fish oil is rich in ω3 series of polyunsaturated fatty acids, and its main component is EPA (eicosapentaenoic acid) & DHA (docosahexaenoic acid). It is not only an essential nutrient for human growth and development, but also has preventive effects. Cardiovascular and cerebrovascular diseases, enhance memory, prevent Alzheimer's disease, anti-inflammatory, inhibit allergic reactions and tumor growth, and promote various physiological functions such as infant retinal development. In recent years, polyunsaturated fatty acids have been widely used in many industries and fields such as medicine, food, and fine chemicals. EPA&DHA and other fish oil derivatives are in short supply. Governments around the world are paying more and more attention to the development of foods rich i...

AI Technical Summary

Problems solved by technology

The low-temperature solvent method requires the use of a large amount of organic solvent, not only the residual organic solvent, but also the recovery of a large amount of organic solvent, and the separation efficiency is not high, so it is not commonly used

The urea inclusion method consumes a large amount of organic solvents, there are problems of solvent recovery and environmental pollution, and it is difficult to separate fatty acids with similar double chain numbers

Chinese patent document CN105713721A (application number: 201610161177.9) discloses a method for concentrating DHA and EPA in fish oil, which belongs to CO 2 Supercritical fluid extraction method; however, supercritical fluid extraction method requires a large investment in equipment, requires high pressure conditions, and can only extract pigments, odorous substances and part of free fatty acids in fish oil, which only serves the purpose of refining fish oil and cannot produce High-purity EPA&DHA

Chinese patent document CN103951556A (application number: 201410192466.6) discloses a deep-sea fish oil as raw material to separate eicosapentaenoic acid (EPA), docosapentaenoic acid (DPA) and docosahexaenoic acid ( The distillation process of DHA) belongs to the molecular distillation method; although the molecular distillation method can obtain high-purity EPA&DHA, it needs high-vacuum equipment, multi-stage distillation, high energy consumption, high equipment maintenance cost, and small production capacity, which is difficult to meet industrial requirements. actual production needs

This patent document uses a variety of methods to obtain high-purity EPA&DHA. However, this method requires a large investment in equipment, low production volume, long production cycle, low product yield, and high cost. It is difficult to meet the needs of actual production.

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