A circulating gas stripping distillation system for extracting EPA&DHA from fish oil

Abstract

The invention relates to a circulating gas stripping rectification system for extracting EPA and DHA from fish oil. The system comprises a gas stripping rectification tower, wherein the top of the gas stripping rectification tower is connected with the top of a heat exchange tower; the bottom of the gas stripping rectification tower is connected with a gas stripping tower kettle storage tank through a gas stripping tower kettle extraction pump; the gas stripping rectification tower is also connected with a raw material preheater and a nitrogen heater; the top of the gas stripping rectification tower is also connected with a washing tower; the top of the washing tower is connected with a fan buffer tank; the fan buffer tank is connected with a vacuum buffer tank through a gas compressor; the vacuum buffer tank is also connected with a vacuum pump and the heat exchange tower separately; the heat exchange tower is also connected with the nitrogen heater; the bottom of the washing tower is connected with a washing tower kettle storage tank through a washing tower kettle extraction pump; the bottom of the washing tower is also connected with a circulating cooler through a washing tower circulating pump, and the circulating cooler is connected with the upper part of the washing tower. The circulating gas stripping rectification system of the invention does not need high vacuum, and the content of the EPA and the DHA can be improved to above 70% by one-time purification.

Description

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

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 reaction device is mainly suitable for subcritical reaction process, and cannot effectively realize the extraction of EPA&DHA

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