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Method for extracting wet algae oil

A technology for wet algae and oil, applied in the production of oil/fat and fat production, can solve the problems of complex oil extraction process, high difficulty in oil extraction wastewater treatment, low oil yield, etc., achieving easy recovery and separation, and reducing solvent costs. And the effect of difficult wastewater treatment and high oil extraction rate

Active Publication Date: 2013-12-04
ENN SCI & TECH DEV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems in the prior art that the treatment of oil extraction wastewater is difficult, the yield of oil is low, and the oil extraction process is complicated, the present invention provides a method for extracting wet algae oil. The method comprises the following steps:

Method used

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specific Embodiment approach 1

[0049] A method for extracting wet algal oil, said method comprising the steps of:

[0050] (1'''''') Mix the wet algae mud of oleaginous microalgae with a water-immiscible organic solvent, add the resulting mixture into a pressure-resistant reactor, seal the reactor, and wait until the reaction temperature is reached Then start to react, wherein the reaction temperature is 100~180°C, and the reaction time is 5~60 minutes;

[0051] (2'''''') Discharging after the reaction, collecting the upper mixed oil phase and the lower water slag phase respectively, and removing the solvent from the upper mixed oil phase to obtain crude oil.

[0052] Wherein, the water-immiscible organic solvent is selected from any one or a mixture of at least two of n-hexane, cyclohexane, n-heptane, petroleum ether or diethyl ether.

specific Embodiment approach 2

[0053] A method for extracting wet algal oil, said method comprising the steps of:

[0054] (1') Mix the wet algae mud of oil-producing microalgae with a water-immiscible organic solvent, add the obtained mixture into a pressure-resistant reactor, and pass inert gas into the reactor to replace the air in the reactor , the number of replacements is 2 to 3 times, then seal the reaction kettle, and start the reaction after reaching the reaction temperature, the reaction temperature is above the azeotropic point of the water-immiscible organic solvent and water;

[0055] (2') After the reaction is completed, the materials are discharged, the upper mixed oil phase and the lower water slag phase are collected respectively, and the upper mixed oil phase is evaporated to remove the solvent to obtain crude oil.

[0056] (3') Repeat step (1') and step (2') 1 to 3 times.

specific Embodiment approach 3

[0057] A method for extracting wet algal oil, said method comprising the steps of:

[0058] (1'') Mix the wet algae mud of oil-producing microalgae with a water-immiscible organic solvent, add the resulting mixture into a pressure-resistant reactor, and replace the reactor with an inert gas into the reactor Air, the number of replacements is 2 to 3 times. After the replacement, pass inert gas into the reactor to make the initial pressure of the reactor reach 0-1MPa (gauge pressure), seal the reactor, and start the reaction after reaching the reaction temperature. Above the azeotropic point of water-immiscible organic solvents and water;

[0059] (2'') After the reaction is completed, the materials are discharged, the upper mixed oil phase and the lower water residue phase are collected respectively, and the upper mixed oil phase is evaporated to remove the solvent to obtain crude oil.

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Abstract

The invention discloses a method for extracting wet algae oil. The method includes the following steps: (1), mixing wet algal mud of oil-producing microalgae with an organic solvent unmixable with water, adding a obtained mixture into a pressure-proof reaction kettle, sealing the reaction kettle, and starting reaction after reaching reaction temperature which refers to be above an azeotropic point of the organic solvent and water; (2), discharging after reaction is finished, respectively collecting upper-layer mixed oil phase and lower-layer water slag phase, removing a solvent from the upper-layer mixed oil phase, and obtaining crude oil. By the method, microalgae mud high in water content is directly utilized as a raw material, and algae cell drying and dehydrating are not needed, so that drying energy consumption is saved; a solvent is used in the process of extraction, so that consumption of the extraction solvent is small, easiness in recovery and separation is realized, and recovery and separation cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of microalgae biochemical engineering, and in particular relates to a method for extracting oil from wet algae. Background technique [0002] Microalgae has great potential as a new bioenergy source, but so far there is no way to commercially produce energy products. One of the important reasons is that the current cost of oil production from microalgae is too high. Although there are many technical methods for oil extraction from microalgae, solvent extraction, quantum fracturing and supercritical CO 2 Extraction methods, etc., but considering the process, energy consumption and equipment scale, the solvent extraction method of dry algae powder is the most used. However, the water content in microalgae cells is as high as 80%, and some analyzes have shown that the energy consumption of the drying process alone will make the energy of the energy products produced by microalgae "beyond the means" (Lardon L e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11B1/10
Inventor 杨巧利张雨忠刘敏胜郭荣
Owner ENN SCI & TECH DEV
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