Method for extraction of unsaturated fatty acid from oil-containing microalgae and preparation of aviation fuels

A technology of unsaturated fatty acids and aviation fuels, which is applied in the field of comprehensive utilization of oil-containing microalgae, which can solve problems such as poor stability, low calorific value of bio-oil, and industrial application limitations, and achieve high-efficiency utilization

Active Publication Date: 2013-07-31
BEIHANG UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although oleaginous microalgae have multiple uses, currently the use of microalgae is limited to a certain aspect, or only extract unsaturated fatty acids from microalgae as health products, or only extract oil to prepare biofuels, or directly pyrolyze to prepare biofuels
Moreover, although bio-aviation fuel bears the dual responsibilities of energy security and carbon emission reduction, there are still many technical obstacles to the commercialization of microalgae biofuels
The reason, first, is mainly due to the low comprehensive utilization efficiency of algal substances in the actual operation process, which leads to high production costs and other problems
Therefore, it is urgent to provide a new technology for the comprehensive utilization of algal substances to solve the problems in the above existing technologies and industrialization; second, the bio-oil obt

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  • Method for extraction of unsaturated fatty acid from oil-containing microalgae and preparation of aviation fuels

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Effect test

Embodiment 1

[0046] A kind of oil-containing microalgae extracts DHA and EPA coupling and prepares aviation fuel method, such as figure 1 The system shown includes:

[0047] 1. Extract oil, separate and purify EPA and DHA: adopt supercritical extraction system with additional rectification column. Add the microalgae dry powder into the ethyl acetate entrainer at a ratio of 1:0.6-0.8, mix well and carry out CO 2 Supercritical extraction, supercritical extraction pressure 25-35MPa, temperature 35-45°C, CO 2 The consumption is 150-250ml / g, the extracted mixed oil is sent to the rectification column for separation and enrichment, the rectification pressure is controlled at 11.0-15.0MPa, the rectification temperature gradient is 40-80°C, CO 2 Consumption is 200-300mL / g. Under this process condition, the extraction rate of EPA and DHA can reach 80-95%, and the total extraction rate of oil is 70-90%.

[0048] 2. Pyrolysis of algae residue: after oil extraction, algae residue is mixed with MCM-...

Embodiment 2

[0051] A method for extracting unsaturated fatty acid from oil-containing microalgae and preparing aviation fuel. Such as figure 1 , including the following steps:

[0052] 1. Extract oil, separate and purify EPA and DHA: Add ethanol or ethyl acetate entrainer to microalgae dry powder at a ratio of 1:0.5-1.0, mix well and conduct CO 2 Supercritical extraction, supercritical extraction pressure 30-35MPa, temperature 38-42°C, CO 2 The consumption is 170-250ml / g, the extracted mixed oil is sent to the rectification column for separation and enrichment, the rectification pressure is controlled at 11.0-15.0MPa, the rectification temperature gradient is 40-80°C, CO 2 The consumption is 200-300mL / g. Under this process condition, the extraction rate of EPA and DHA can reach 75-95%, and the total extraction rate of oil is 70-90%.

[0053] 2. Pyrolysis of algae residue: after oil extraction, algae residue is mixed with MCM-41 or HZSM-5 at a mass ratio of 2-4:1, in a fluidized bed rea...

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Abstract

The invention provides a method for extraction of unsaturated fatty acid from oil-containing microalgae and preparation of aviation fuels. The method includes: 1) subjecting microalgae to crushing and wall breaking to obtain microalgal powder particles and adding an entrainer, extracting the unsaturated fatty acid in the microalgal powder particles by a supercritical CO2 extraction technique to obtain mixed oil and algal residue; 2) conducting separation and enrichment on the mixed oil extracted in step 1) to obtain unsaturated fatty acid and residual oil; and 3) performing thermal cracking on the algal residue obtained in step 1) to obtain pyrolytic bio-oil, then mixing the pyrolytic bio-oil with the residual oil, and performing a hydrogenation treatment to obtain a kerosene-containing main product and a byproduct containing gasoline and diesel. According to the method, the unsaturated fatty acid extraction rate can reach 80-95%, and the total extraction rate of oil is 70-90%. The obtained kerosene ingredient can reach the standard of aviation kerosene.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of oil-containing microalgae, in particular to the pyrolysis of remaining oil and residual residue after extraction including but not limited to polyunsaturated fatty acids DHA (docosahexaenoic acid) / EPA (eicosapentaenoic acid) A method for producing aviation kerosene through co-hydrogenation and isomerization of bio-oil, and by-product gasoline and diesel. Background technique [0002] Compared with other energy plants, microalgae have become the main biological raw materials for alternative energy due to the characteristics of high photosynthetic efficiency, high oil yield, no occupation of cultivated land, and no collection of food from people. In addition, algae cells also contain a large amount of polyunsaturated fatty acid nutrients that can reduce high blood pressure and heart disease, which lays the foundation for the development of multi-effect utilization of microalgae. [0003]...

Claims

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Application Information

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IPC IPC(8): C11B1/10C11B7/00C11B13/02C10G3/00C07C51/42C07C57/03
CPCY02P20/54Y02P30/20Y02W30/74
Inventor 杨晓奕丁水汀赵兵伟李娅王鑫刘子钰
Owner BEIHANG UNIV
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