Supercritical Co2 extraction method and process:
First introduce the supercritical state. Matter is divided into three states: gas state, liquid state, and solid state. The fourth state of matter is the supercritical state, that is, the state above the critical temperature and critical pressure. In this state, the gas-liquid interface Disappearance is neither a gas nor a liquid, but a fluid state, so it is called a supercritical fluid.
Supercritical CO2 extraction is a process of extracting and separating the mixture in a supercritical fluid (temperature 31.3°C, pressure 7.15MPa) with carbon dioxide as the solvent and the high permeability and high solubility of the fluid. The carbon dioxide fluid in the supercritical state not only has the density and dissolving ability equivalent to the liquid, but also the diffusion and permeation ability equivalent to the gas, which leads to an increase in the solubility of the solute. The solubility of supercritical carbon dioxide fluid is closely related to pressure and temperature. Near the critical point, small changes in temperature and pressure will cause a sudden change in its solubility. In the separation operation, the density of the solvent can be reduced by reducing the pressure or increasing the temperature. , Causing a decrease in its ability to dissolve substances, which can separate the extract from the solvent. Compared with general liquid extraction, the speed and range of supercritical carbon dioxide extraction are more expanded. The extraction process is achieved by adjusting the temperature and pressure to control the affinity with the solute to achieve separation.
Basic Flow :
Co2 is the most commonly used solvent in supercritical fluid technology and has many advantages:
1. The critical temperature of CO2 is 31.1℃ and the critical pressure is 7.2MPa. The critical conditions are easy to reach. Suitable for extracting thermally unstable compounds;
2. The chemical nature of CO2 is inactive, to avoid oxidation of the product, and does not affect the effective components of the extract;
3. The extraction speed is fast, colorless, odorless, non-toxic, safe, and does not pollute the environment;
4. The price is cheap, the purity is high, and it is easy to obtain;
5. No solvent residues, no nitrates and heavy metal ions.
Customer site operation video of supercritical Co2 extraction device：
If you have any needs, please feel free to contact us:
Phone/WhatsApp/Wechat: +86 18192820519
Email: salesj@toptionlab.com