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Method for extracting oil from microalgae by utilizing ionic liquid

An ionic liquid and oil extraction technology, which is applied in the direction of fat oil/fat production and fat generation, can solve the problems of high cost, low extraction rate, and low extraction efficiency, and achieve the effect of easy separation and improved extraction rate

Inactive Publication Date: 2012-07-18
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the cell wall of most oil-bearing microalgae is thick and there is a polar hydration layer on the outer wall of the cell, the direct use of organic solvents to extract oil takes a long time and the extraction efficiency is low
The pressing method has the problems of low extraction rate and high energy consumption
Although some auxiliary means to improve the extraction rate of oil, such as chemical methods, ultrasonic methods, enzymatic methods or supercritical methods, have certain effects, but there are problems such as long time-consuming, high cost, high energy consumption, and high requirements for equipment.

Method used

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  • Method for extracting oil from microalgae by utilizing ionic liquid
  • Method for extracting oil from microalgae by utilizing ionic liquid
  • Method for extracting oil from microalgae by utilizing ionic liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Get 20g of Chlorella and add it to 80g of 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) ionic liquid, heat up to 80°C, and stir magnetically for 3 hours, (sampling is taken under a microscope for photographic analysis, the pellets The cell walls of the algae are completely disrupted and dissolved in the ionic liquid, while the lipids are released (see figure 2 )); adding a certain amount of n-hexane to extract the oil (the volume ratio of n-hexane and ionic liquid is 1:3), the solution is layered, the n-hexane phase containing oil is on the upper layer, the ionic liquid phase is on the lower layer, and the upper layer solution is taken out , Normal pressure distillation removes normal hexane, obtains grease 6.1g, and normal hexane is recycled; Add a certain amount of distilled water in the ionic liquid phase of the lower layer, ionic liquid is dissolved in the water phase, and the components such as cell wall of the microalgae that dissolves in ionic liquid precipitat...

Embodiment 2

[0027] Get 20g botrytis and join in 80g chlorinated 1-butyl-3-methylimidazole ([Bmim]Cl) ionic liquid, heat up to 80 ℃, after magnetic stirring 3h, (sampling is under microscope photographic analysis, botrytis The cell wall is completely disrupted and dissolved in the ionic liquid, while the lipids are released (see Figure 4 )); adding a certain amount of n-hexane to extract the oil (n-hexane and ionic liquid volume ratio is 1:1), the solution is layered, the n-hexane phase containing oil is in the upper layer, the ionic liquid phase is in the lower layer, and the upper layer solution is taken out , Normal pressure distillation removes normal hexane, obtains oil 7.3g, and normal hexane is recycled; Add a certain amount of distilled water in the ionic liquid phase of the lower layer, ionic liquid dissolves in the water phase, and the composition precipitation such as the cell wall of the microalgae that dissolves in ionic liquid out, the aqueous phase is removed by distillatio...

Embodiment 3

[0029] Get 20g chlorella and join in 80g1-ethyl-3-methylimidazole acetate ([Emim]CH 3 COO) in the ionic liquid, warming up to 60°C, after magnetic stirring for 2 hours; adding a certain amount of n-hexane to the system to extract the oil (the volume ratio of n-hexane and ionic liquid is 1:3), the solution is layered, and the n-hexane containing oil The phase is in the upper layer, and the ionic liquid phase is in the lower layer. The upper layer solution is taken out, and n-hexane is removed by normal pressure distillation to obtain 6.3 g of oil, and the n-hexane is recycled; a certain amount of distilled water is added to the lower ionic liquid phase, and the ionic liquid is dissolved in the water phase. , and the microalgae cell wall and other components dissolved in the ionic liquid are precipitated, and the water phase is removed by distillation, and the ionic liquid is regenerated and recycled.

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Abstract

The invention relates to a method for extracting oil from microalgae by utilizing ionic liquid, which comprises the following steps of: 1) preparing functionalized ionic liquid; 2) adding a certain quantity of microalgae into the ionic liquid and magnetically agitating through heating to dissolve the microalgae; 3) extracting oil in an ionic liquid mixture by using an organic solvent; and 4) adding a certain quantity of water into an ionic liquid phase after the oil is extracted, removing a water phase through evaporation, realizing the regeneration of the ionic liquid and reusing the ionic liquid. According to the method, the ionic liquid is utilized to dissolve the microalgae so as to extract the oil, almost has no vapor pressure and has the characteristics of greenness, environment friendliness and the designability; the cell wall of a microalgae can be remarkably damaged to release oil in a microalgae cell or on the cell wall; the oil is easily separated from the ionic liquid, so that the extraction rate of the oil can be remarkably improved; and the ionic liquid can be recycled through a water dilution method. The method can become a new process for microalgae oil extraction.

Description

technical field [0001] The invention relates to a method for extracting oil from microalgae, in particular to a method for using ionic liquid to extract oil from microalgae. Background technique [0002] With the rapid development of global economic integration, energy shortages and the greenhouse effect caused by carbon dioxide emissions have become a major threat to the sustainable development of mankind. If there is a technology that can reduce carbon dioxide and increase the supply of renewable energy, it must be welcomed. Algae produce biodiesel and biogas by "eating" carbon dioxide. In recent years, biodiesel, as an alternative fuel to fossil energy, has become the fastest growing and most widely used environmentally friendly renewable energy in the world. [0003] Biodiesel is a long-chain fatty acid methyl ester obtained by decomposing and esterifying biological oils as raw materials. It is an environmentally friendly and renewable energy that can replace ordinary ...

Claims

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Application Information

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IPC IPC(8): C11B1/10C11B1/04
Inventor 郭晨高红帅王锋刘春朝
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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