Method for extracting oil from diatom through low-temperature continuous phase transition

A low-temperature continuous phase change and extraction technology, which is applied in the production of fat/fat and fat production, can solve the problems of solvent residue, low extraction rate and difficult process, and achieve no solvent residue, shorten extraction and separation time, and process flow. simple effect

Inactive Publication Date: 2016-12-07
东莞市民益生物科技有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, diatom oil extraction techniques include Soxhlet extraction, organic solvent extraction, ultrasonic extraction, osmotic pressure breaking extraction, mechanical breaking extraction, supercritical carbon dioxide extraction, etc. At present, these methods are difficult to be industrialized due to the tedious process and low extraction rate.
The low-temperature continuous phase change extraction of diatoms is also used in the extraction of microalgae oils. Butane, propane, liquefied petroleum gas, etc. are often used as extraction agents, and it is easy to cause a series of problems such as solvent residues in the product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 2kg of diatom dry powder into a 10L extraction kettle, extract at a temperature of 50°C, and an extraction pressure of 0.7MPa, compress ethanol into a liquid, flow through the extraction kettle countercurrently at a flow rate of 120L / h, and extract continuously for 75min. After the extractant enters the desorption kettle, the desorption temperature is 65°C, the desorption pressure is 0.4MPa, and the extractant ethanol is transformed into a gas to release the extract. After the ethanol gas is cooled and pressurized, it is extracted again. After 75 minutes the product was obtained 408g. Crude oil extract accounted for 20.4% of the dry matter.

Embodiment 2

[0020] Take 2kg of wet diatoms (moisture content about 73%) and add them to a 10L extraction kettle. The extraction temperature is 55°C and the extraction pressure is 0.9MPa. Compress the ethanol into a liquid, and flow through the extraction kettle countercurrently at a flow rate of 100L / h for continuous extraction. 90min. After the extractant enters the desorption kettle, the desorption temperature is 65°C, the desorption pressure is 0.4MPa, and the extractant ethanol is transformed into a gas to release the extract. After the ethanol gas is cooled and pressurized, it is extracted again. After 90 minutes 128 g of product were obtained. Crude oil extract accounted for 23.7% of the dry matter.

Embodiment 3

[0022] Add 2kg of diatom dry powder into a 10L extraction kettle, extract at a temperature of 45°C, and extract at a pressure of 0.5MPa. Compress ethanol into a liquid, flow through the extraction kettle countercurrently at a flow rate of 150L / h, and extract continuously for 120 minutes. After the extractant enters the analysis kettle, the analysis temperature is 60°C, the analysis pressure is 0.3MPa, and the extraction agent ethanol is converted into gas to release the extract. After the ethanol gas is cooled and pressurized, it is extracted again. After 120 minutes 384 g of product were obtained. Crude oil extract accounted for 19.2% of the dry matter.

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Abstract

The invention belongs to the field of oil extraction, and provides a method for extracting oil from diatom by a low-temperature continuous phase transition technique and by using ethanol as an extraction agent. The method comprises the specific steps of loading diatom dry powder or diatom ooze to an extraction kettle, under the condition that the pressure is lower than the critical pressure of the extraction agent and the temperature is lower than the critical temperature of the extraction agent, enabling the extraction agent namely the ethanol which is compressed into liquid to pass through the extraction kettle at a certain flow rate in a countercurrent manner for extraction, after extraction is completed, enabling the extraction agent namely the ethanol to enter a separation kettle, performing heating and performing decompressing so that the ethanol is turned into gas, and an extract is released. The ethanol gas is compressed into liquid, then the liquid enters the extraction kettle for extraction, and circulation is performed. The method disclosed by the invention has the advantages of being low in extraction and separation pressure and extraction and separation temperature, large in treating capacity, low in cost, and high in extraction rate, and products are free from solvent residues.

Description

technical field [0001] The invention relates to the field of oil extraction, in particular to a method for extracting diatom oil by continuous phase change at low temperature. Background technique [0002] Diatoms are a type of single-celled plants, often composed of several or many individual cells connected into various groups. Diatoms are the main components of marine organisms and play an extremely important role in the material and energy cycles of marine ecosystems. Different from most algae, diatom assimilation products are mainly oil or polysaccharides, in which the oil is stored in the cells in the form of oil droplets, and the content can account for 40-60%, so it is considered to be one of the most suitable biodiesel raw materials. [0003] At present, diatom oil extraction techniques include Soxhlet extraction, organic solvent extraction, ultrasonic extraction, osmotic pressure wall breaking extraction, mechanical wall breaking extraction, supercritical carbon d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11B1/04C11B1/10
CPCC11B1/04C11B1/10
Inventor 何智慧刘文富
Owner 东莞市民益生物科技有限公司
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