The principle of supercritical carbon dioxide extraction and separation process is to use supercritical carbon dioxide with special dissolving effect on some special natural products, and use the relation between the solubility of supercritical carbon dioxide and its density, that is, the influence of pressure and temperature on the solubility of supercritical carbon dioxide.

The principle of supercritical carbon dioxide extraction and separation process is to use supercritical carbon dioxide with special dissolving effect on some special natural products, and use the relation between the solubility of supercritical carbon dioxide and its density, that is, the influence of pressure and temperature on the solubility of supercritical carbon dioxide. In the supercritical state, supercritical carbon dioxide is contacted with the substance to be separated, so that it can selectively extract the components with different polarity, boiling point and molecular weight. Corresponding to various pressure range, of course, the resulting extracts are not single, but can get the best proportion of mixture composition control condition, and then with the help of decompression, heating method of supercritical fluid into normal gas, by extraction substance is full or basic precipitation, so as to achieve the purpose of the separation and purification, so co2 supercritical fluid extraction process is made up by extraction and separation. Supercritical extraction devices can be divided into two types. One is research and analysis type, which is mainly used for the analysis of small quantities of substances, or to provide data for production. The second is the production type, which is mainly used in batch or mass production.

The supercritical extraction plant can be divided into eight parts in terms of function: extractant supply system, cryogenic system, high-pressure system, extraction system, separation system, modifier supply system, circulation system and computer control system. It includes carbon dioxide injection pump, extractor, separator, compressor, carbon dioxide storage tank, water chiller and other equipment. Because the extraction process is under high pressure, the pressure resistance of the equipment and the entire pipeline system is required to be high. The automatic monitoring of the production process by microcomputer can greatly improve the safety and reliability of the system and reduce the operation cost. Articles come from the Internet

Carbon dioxide extraction