What are the characteristics of Supercritical carbon dioxide extraction?
The principle of supercritical carbon dioxide extraction and separation process is to use supercritical carbon dioxide to have a special dissolving effect on some special natural products, and the relationship between the solubility and density of supercritical carbon dioxide is used, that is, the influence of pressure and temperature on the solubility of supercritical carbon dioxide.
What is the technical principle of supercritical CO2 extraction?
The principle of supercritical carbon dioxide extraction and separation process is to use supercritical carbon dioxide to have a special dissolution effect on some special natural products, and use the relationship between the solubility and density of supercritical carbon dioxide, that is, the influence of pressure and temperature on the solubility of supercritical carbon dioxide. In the supercritical state, components with different polarity, boiling point and molecular weight are selectively extracted in contact with the substance to be separated from the supercritical carbon dioxide. Of course, the extracts corresponding to each pressure range cannot be single, but the optimal ratio of mixed ingredients can be adjusted. Then the supercritical fluid becomes an ordinary gas by reducing pressure and heating, and the extracted substances are completely or basically precipitated to achieve the purpose of separation and purification, so the supercritical fluid carbon dioxide extraction process is composed of a combination of extraction and separation.
What is a supercritical CO2 extraction device?
Supercritical extraction units can be divided into two types. One is the research analysis type, which is mainly used for the analysis of small quantities of substances or to provide data for production. The second is the preparation production type, which is mainly suitable for large-scale or large-scale production.
The supercritical extraction device can be roughly divided into 8 parts in terms of function: extractant supply system, low temperature system, high pressure system, extraction system, separation system, modifier supply system, circulation system and computer control system. Specifically, it includes carbon dioxide injection pumps, extractors, separators, compressors, carbon dioxide storage tanks, chillers and other equipment. The extraction process is carried out under high pressure, so the pressure resistance performance of the equipment and the entire pipeline system is very demanding, and the automatic monitoring of the microcomputer in the production process can greatly improve the safety and reliability of the system and reduce the operating cost.
What are the characteristics of supercritical CO2 extraction?
1) Supercritical fluid carbon dioxide extraction and chemical extraction
(1) It can be extracted from a place close to room temperature (35-40) and CO2 gas to effectively prevent the oxidation and divergence of heat-sensing substances. Therefore, all the components of medicinal plants can be retained in the extract, extracting substances with high boiling point, low volatility and easy thermal decomposition below the boiling point temperature.
(2) The use of SFE is a clean extraction method, no organic solvents are used in the whole process, so there is no residual solvent in the extract at all, and it prevents poisoning and environmental pollution to the human body during the extraction process, and is 100% natural.
(3) Extraction and separation are combined into one, when the CO2-SCF filled with dissolved substance passes through the separator, due to the pressure drop, CO2 and the extract quickly become two-phase (gas-liquid separation) and are immediately separated. High extraction efficiency and low energy consumption can reduce costs. (4) CO2 is an inactive gas, no chemical reaction occurs during the extraction process, it is a non-combustible gas, odorless, non-toxic, non-toxic, and has good safety.
(5) CO2 is cheap, pure, easy to obtain, and recycled during production, reducing costs.
(6) Both pressure and temperature can be parameters to regulate the extraction process. The extraction purpose is achieved by changing the temperature or pressure. The pressure is fixed and the substance can be separated by changing the temperature. On the contrary, the temperature is fixed, the pressure is reduced, the extract is separated, the process is easy to master, and the extraction speed is fast.
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