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Technical characteristics of supercritical CO2 extraction
Release time:
2019/04/11
Extraction can be carried out at close to room temperature (35-40 ℃) and under CO2 gas cover, preventing the oxidation and dissipation of heat-sensitive substances. Therefore, all the components of medicinal plants are maintained in the extract, and the substances with high boiling point, low volatility and easy pyrolysis can be extracted below their boiling point temperature;
Supercritical fluid CO2 extraction and chemical extraction
(1) can be extracted at close to room temperature (35-40 degrees C) and CO2 gas cover, to prevent the oxidation and dissipation of heat-sensitive substances. Therefore, all the components of medicinal plants are maintained in the extract, and the substances with high boiling point, low volatility and easy pyrolysis can be extracted below their boiling point temperature;
(2) The use of SFE is a clean extraction method, because the whole process does not use organic solvents, so the extract is no residual solvent, but also to prevent the extraction process on the human body and environmental pollution;
(3) extraction and separation into one, when the CO2-SCF full of dissolved matter flow through the separator, due to the pressure drop makes CO2 and extract quickly become two-phase (gas-liquid separation) and immediately separated, not only high extraction efficiency and less energy consumption, cost savings;
(4)CO2 is an inactive gas, the extraction process does not occur chemical reaction, and is a non-combustible gas, no smell, no smell, no poison, so the safety is good;
(5)CO2 is cheap, high purity, easy to obtain, and recycled in the production process, thereby reducing costs;
(6) Both pressure and temperature can be parameters for adjusting the extraction process. The extraction is achieved by changing the temperature or pressure. The pressure is fixed, and the material can be separated by changing the temperature; on the other hand, the temperature is fixed, and the pressure is reduced to separate the extract, so the process is simple and easy to master, and the extraction speed is fast.
Characteristics from the nature of supercritical fluids
(1) High extraction speed and liquid extraction, especially suitable for the separation and extraction of solid substances;
(2) Operating under conditions close to room temperature, the energy consumption is lower than that of general distillation, which is suitable for the separation of heat-sensitive substances and easily oxidized substances;
(3) The heat transfer rate is fast and the temperature is easy to control;
(4) Suitable for the separation of volatile substances
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