Among several supercritical fluid (abbreviated SCF) technologies, the earliest developed, most researched and industrialized product technology is undoubtedly the supercritical fluid extraction (abbreviated SFE) technology.
Supercritical fluid extraction (SFE) is the process of separating one component (the extractant) from another (the matrix) using supercritical fluids as the extracting solvent.
What is supercritical CO2 fluid extraction used for? Can supercritical CO2 extraction help you run for president of the United States? Does CO2 extraction remove pesticides? What is supercritical …
Why is carbon dioxide used as a supercritical fluid? Is supercritical CO2 extraction safe? Is supercritical CO2 corrosive? What can supercritical CO2 extract？What are the advantages and disadvantages …
What is the best raw material processing method? What is the best CO2 extraction pressure? What is the best CO2 extraction temperature? What are the best supercritical CO2 extraction parameters?
Pressure reduction method, variable temperature method and constant temperature and constant pressure adsorption method. The answer has been provided, I guess you will understand it after reading it.
What are the advantages of supercritical CO2 extraction？What are the featuress of supercritical CO2 extraction?How does supercritical fluid extraction work?
What is the entrainer of supercritical CO2 extraction? What are the the use method and selection criteria of entrainer (cosolvent)? What should be considered when choosing an entrainer?
What is the effect of multi-stage extraction of supercritical CO2 extraction ? Why does supercritical extraction require multi-stage separation?
7 kinds of fine separation and extraction technologies combined with supercritical extraction technology have expanded the application range of CO2 extraction.
Supercritical CO2 extraction (SCFE) is used particularly in the food, beverage, cosmetics and pharmaceutical industry for extracting natural substances, aromas, fats, oils, waxes, polymers, enzymes and colourants in their supercritical physical state.
CO2 is a natural and environmentally-friendly solvent which has advantages over synthetic and harmful media such as n-hexane when it comes to sustainability.
Supercritical extraction uses a supercritical fluid as the separation medium (extractant), and uses the fluid to have a highly enhanced dissolving ability in a supercritical state to achieve effective extraction of certain components (solutes) in the raw material, and then pass the temperature and The continuous adjustment of the pressure can reduce the density of the extractant, that is, reduce its solubility to the solute, so as to achieve high-efficiency separation of specific components in the raw material.
Because supercritical fluid has excellent mass transfer characteristics of gas and solvation ability equivalent to liquid solvents, supercritical extraction using it as a separation medium is considered to integrate the two unit operations of distillation and liquid-liquid extraction to a certain extent. The advantages of this form a unique separation technology.
The basis of the theory is the phase equilibrium relationship of the fluid mixture in the supercritical state, which operates in the mass transfer process.
The most commonly used supercritical fluid in the supercritical extraction process is SC-CO2, and the products obtained by supercritical CO2 are mostly a mixture of volatile oils, greases, alcohols, ethers, esters, resins and other lipophilic chemical components;
For substances with greater polarity (such as flavonoids, saponins, alkaloids, etc.), a small amount of polar entrainer (or co-solvent, modifier, co-solvent) is often added to increase the CO2 polarity. The ability to dissolve sexual substances.
The addition of a small amount of co-solvents (such as water, methanol, ethanol, acetone, ethyl acetate, etc.) can not only increase the density of the supercritical fluid, but more importantly, it can form a new strong intermolecular force with some solute molecules , Thereby improving the selectivity of the process.