6 Materials in the CO2 extraction process
The n-alkanes with carbon atoms below 12 can all be mutually soluble in supercritical CO2 fluids. If more than 12 carbon atoms, the solubility will decrease sharply. Compared with normal alkanes, isoalkanes have greater solubility
Normal alcohols with less than 6 carbons can dissolve each other in supercritical CO2 fluid. If the carbon number is further increased, the solubility will decrease significantly. Adding side chains to n-alcohols can appropriately increase solubility just like alkanes.
The solubility of phenol is 3%, and the solubility can be increased when methyl is substituted for phenol. Etherified phenolic hydroxyl will significantly increase solubility4. Carboxylic acidAliphatic carboxylic acids with less than 9 carbons are mutually soluble in supercritical CO2 fluids, while dodecanoic acid (laurel has only 1% solubility. The presence of halogens, hydroxyl groups, and aromatic groups will reduce the solubility of aliphatic carboxylic acids
Esterification will significantly increase the solubility of the compound in supercritical CO2 fluid.
Simple aliphatic aldehydes such as acetaldehyde, valeraldehyde, and heptaldehyde, etc., can dissolve aliphatic aldehydes in supercritical CO2 fluids. The unsaturated structure of aliphatic aldehydes has no obvious effect on its solubility. However, phenyl substitution will reduce unsaturated aldehydes. The solubility of supercritical CO2 fluids.
It occupies an important position in plant mucosal oil and is a key component of various natural fragrances. In the process of supercritical CO2 fluid extraction of natural products such as spices and food, the solubility of terpenoids in supercritical CO2 fluid has a very strong influence. Important practical value.
The relative molecular mass of terpenoids has a certain effect on solubility. From monoterpene pinene to sesquiterpene phyllite and diterpene intetraene, the solubility of terpene compounds in supercritical CO2 fluid gradually decreases, and terpene molecules For every 5 more carbon atoms, the solubility drops about 5 times. The reason for this difference may be that as the relative molecular mass increases, the volatility of the compound decreases.