Method for extracting microalgal oil by supercritical CO2 isothermal transformation technology

A microalgae oil and supercritical technology, which is applied in the direction of fat oil/fat production and fat production, can solve the problems of uneven extraction effect and solvent residue, and achieve the effects of excellent product quality, prevention of poisoning, and high oil yield

Inactive Publication Date: 2012-08-22
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the extraction methods of microalgae oil at home and abroad are different, and the extraction effect is uneven. For example, if the organic solvent extraction method is used to extract microalgae oil, there is a problem of solvent residue.

Method used

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  • Method for extracting microalgal oil by supercritical CO2 isothermal transformation technology
  • Method for extracting microalgal oil by supercritical CO2 isothermal transformation technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Raw material pretreatment

[0031] The dried microalgae raw materials are removed from impurities, pulverized and ground, passed through a 150-mesh sieve (particle size 106 μm), and the under-sieve is removed for supercritical extraction.

[0032] 2. Microalgae filling

[0033] Put the pulverized microalgae fine dry powder into the extraction kettle 6, the filling factor is 80%, and cover the sealing cover of the extraction kettle after filling.

[0034] 3. Extraction

[0035] will CO 2 CO in tank 1 2 After being compressed by the high-pressure compressor 2 and cooled by the cooler 3 to reach a supercritical state, it is injected into the extraction kettle 6 for extraction. The pressure in the extraction kettle was kept at 18MPa, the extraction temperature was kept at 38°C, and the extraction time was controlled at 150min.

[0036] 4. Oil separation

[0037] After the extraction operation was completed, the extraction residue in the extraction kettle 6 was disc...

Embodiment 2

[0040]1. Raw material pretreatment

[0041] The dried microalgae raw materials are removed from impurities, pulverized and ground, passed through a 200-mesh sieve (75 μm in particle size), and the under-sieve is removed for supercritical extraction.

[0042] 2. Microalgae filling

[0043] Put the pulverized microalgae fine dry powder into the extraction kettle 6, the filling factor is 85%, and cover the sealing cover of the extraction kettle after filling.

[0044] 3. Extraction

[0045] will CO 2 CO in tank 1 2 After being compressed by the high-pressure compressor 2 and cooled by the cooler 3 to reach a supercritical state, it is injected into the extraction kettle 6 for extraction. The pressure in the extraction kettle was kept at 20MPa, the extraction temperature was kept at 42°C, and the extraction time was controlled at 160min.

[0046] 4. Oil separation

[0047] After the extraction operation was completed, the extraction residue in the extraction kettle 6 was dis...

Embodiment 3

[0050] 1. Raw material pretreatment

[0051] The dry raw material of microalgae is impurity-removed, crushed and ground, passed through a 250-mesh sieve (particle size 58 μm), and the under-sieve is removed for supercritical extraction.

[0052] 2. Microalgae filling

[0053] Put the pulverized microalgae fine dry powder into the extraction kettle 6, the filling coefficient is 83%, and cover the sealing cover of the extraction kettle after filling.

[0054] 3. Extraction

[0055] will CO 2 CO in tank 1 2 After being compressed by the high-pressure compressor 2 and cooled by the cooler 3 to reach a supercritical state, it is injected into the extraction kettle 6 for extraction. The pressure in the extraction kettle was kept at 25MPa, the extraction temperature was kept at 34°C, and the extraction time was controlled at 180min.

[0056] 4. Oil separation

[0057] After the extraction operation was completed, the extraction residue in the extraction kettle 6 was discharged ...

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Abstract

The invention relates to a method for extracting microalgal oil by supercritical CO2 isothermal transformation technology. The method comprises the steps of: removing impurities in dried microalgae, and then crushing and grinding; putting the ground microalgae dry powder into an extraction kettle, filling supercritical CO2 into the extraction kettle, and extracting under the conditions that the pressure is 12-25MPa, the temperature is 34-42 DEG C and the time is 150-180min; carrying out isothermal decompression separation on the supercritical CO2 containing solute successively by two stages of separators; and collecting fatty acid oil extract separated out from the bottoms of the two stages of separators to obtain the product. According to the method, organic solvent is not needed in the whole process, so that no residual solvent exits in the extract, and oxidation and thermal cracking are not caused in the extraction process; the oil is high in yield and purity; the product is excellent in quality; the whole set of technology is simple in operation and does not have corresponding post-processing requirement. Meanwhile, the method prevents the microalgal oil from poisoning the human body and polluting the environment in the extracting process.

Description

technical field [0001] The invention relates to the extraction of fatty acid oil from microalgae, in particular to a method using supercritical CO 2 A method for extracting oil from microalgae by isothermal pressure swing technology. Background technique [0002] With the development of the global economy and population growth, the relationship between oil and human beings is getting closer and closer. Whether it is used as a raw material for biodiesel or processed into health food, oil plays a vital role. At present, the main source of oil is still plant and animal fat, but this traditional oil source can no longer fully meet the various needs of people's food, industry and other life. However, many microalgae have extremely high oil content. According to conservative estimates, microalgae can produce 30,000-50,000L of oil per hectare per year, while oil-rich plants, such as palms and jatropha, can only produce 1300-2400L of oil per hectare per year. [0003] Microalgae h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11B1/10C11B1/04
Inventor 黄福川卢朝霞莫宇飞梁景卢誉远李宏君谢云果杨茂立唐兴中粟满荣田宗义蓝明新
Owner GUANGXI UNIV
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