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
2 Cites 20 Cited by

AI-Extracted 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 cons...
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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.

Application Domain

Fatty-oils/fats production

Technology Topic

IonChemistry +5

Image

  • 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(4)

Example Embodiment

[0024] Example 1
[0025] Take 20g of Chlorella and add it to 80g of 1-butyl-3-methylimidazole chloride ([Bmim]Cl) ionic liquid, raise the temperature to 80℃, and stir it magnetically for 3h. (Sampling is taken and analyzed under a microscope. The cell wall of the algae is completely destroyed and dissolved in the ionic liquid, and the oil is released (see figure 2 )); Add a certain amount of n-hexane to the system to extract grease (the volume ratio of n-hexane to ionic liquid is 1:3), the solution is layered, the n-hexane phase containing grease 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 to remove n-hexane to obtain 6.1g of fat, n-hexane is recycled; a certain amount of distilled water is added to the lower ionic liquid phase, the ionic liquid is dissolved in the water phase, and the microalgae cell wall dissolved in the ionic liquid precipitates Out, the water phase is removed by distillation, and the ionic liquid is regenerated and recycled.

Example Embodiment

[0026] Example 2
[0027] Take 20g of Botryococcus and add it to 80g of 1-butyl-3-methylimidazole chloride ([Bmim]Cl) ionic liquid, raise the temperature to 80℃, and stir it magnetically for 3h. (Sampling is taken under a microscope for analysis. The cell wall is completely destroyed and dissolved in the ionic liquid, and the oil is released (see Figure 4 )); Add a certain amount of n-hexane to the system to extract grease (the volume ratio of n-hexane to ionic liquid is 1:1), the solution is layered, the n-hexane phase containing grease 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 to remove n-hexane to obtain 7.3g of fat, n-hexane is recycled; add a certain amount of distilled water to the lower ionic liquid phase, the ionic liquid is dissolved in the water phase, and the microalgae cell wall dissolved in the ionic liquid precipitates Out, the water phase is removed by distillation, and the ionic liquid is regenerated.

Example Embodiment

[0028] Example 3
[0029] Take 20g of Chlorella and add it to 80g of 1-ethyl-3-methylimidazole acetate ([Emim]CH 3 COO) in the ionic liquid, heat up to 60℃, magnetically stir for 2h; add a certain amount of n-hexane to the system to extract grease (the volume ratio of n-hexane to ionic liquid is 1:3), the solution is layered, and the n-hexane containing grease The ionic liquid phase is in the upper layer and the ionic liquid phase is in the lower layer. Take out the upper layer solution and distill at atmospheric pressure to remove the n-hexane to obtain 6.3 g of grease. , And the microalgae cell walls dissolved in the ionic liquid are precipitated, the water phase is removed by distillation, and the ionic liquid is regenerated and recycled.
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Description & Claims & Application Information

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