The use of supercritical carbon dioxide to replace the current organic solvent dyeing technology, for environmental protection, wastewater treatment and manufacturing costs, there are many advantages. Due to the supercritical carbon dioxide fluid, the basic characteristics are closer to the gas, so for the application to replace the organic liquid, polyester fiber dyeing technology process, there will be no waste discharge problems, but also can reduce the amount of water and waste, increase production, reduce energy consumption.

In addition, the following chemical industries have also begun to use supercritical carbon dioxide extraction technology to reduce the production of pollutants in the production process: 1. the removal of petroleum residue oil; 2. the recovery of crude oil and the regeneration of lubricating oil; 3. the separation of hydrocarbons and the extraction of coal liquefied oil; 4. the treatment of waste liquid containing difficult to decompose substances.

Application in the field of food:

In the field of food, supercritical carbon dioxide extraction is mainly used for the extraction of vegetable oils (soybean oil, castor oil, palm oil, cocoa butter, corn oil, rice bran oil, wheat germ oil, etc.); Animal oils (fish oil, liver oil, various aquatic oils) extraction; Degreasing of food raw materials (rice, flour, poultry eggs); Separation and refining of lipid mixtures (glycerides, fatty acids, lecithin, etc.); Decolorization and deodorization and deodorization of oil; supercritical state by enzyme exchange; extraction of plant pigments and natural aroma components; decaffeination of coffee and black tea; extraction of hops; manufacture of soft drinks; concentration of fermented alcohol, etc.

The supercritical carbon dioxide extraction method was used to extract soybean oil successfully, and the quality of the product was greatly improved, and there was no pollution problem. Supercritical carbon dioxide can be used to extract fats and oils from sunflower seeds, safflower seeds, peanuts, wheat germ, palm and cocoa beans, and the proposed fats and oils contain neutral lipids, low phosphorus content, low coloration and no odor. This method has a higher recovery rate than the traditional pressing method, and there is no solvent separation problem of the solvent method.

Application in the field of medicine:

Supercritical carbon dioxide extraction technology to extract natural drugs: the use of supercritical carbon dioxide, with a special alcohol material as an entrainer, extraction of ginkgo flavonoids and ginkgolides. The extraction rate of this method is 3.4, which is 2 times higher than 1% of the solvent method. The process is short, and the operation time of the extraction batch is 11 times shorter than that of the solvent method, thus improving the work efficiency. The quality of the effective components of Ginkgo biloba leaves (28% flavonoids and 7.2 ginkgolides) is higher than the current recognized quality standards, and there is no organic solvent residue and heavy metal residue.

Application in extraction of biologically active substances:

Using SFE-CO2 technology to extract and concentrate EPA and DHA in sardine oil can increase EPA and DHA from 17% and 12% to 58% and 67% respectively.

Egg yolk phosphatide was extracted from dried egg yolk by SFE-CO2. Under certain conditions, 67g yolk phosphatide could be extracted from 100g sample. Compared with the traditional solvent method, the purity and extraction rate are improved, and the product color is good.

β-carotene was extracted from tomato erosion waste, with 5% ethanol as entrainer, and the extraction rate was 50% under certain conditions. Petroleum ether and SFE-CO2 were used to extract β-carotene from Spirulina platensis. The results showed that SFE-CO2 technology had the advantages of high efficiency, fast speed, simple process, pure color and taste.

In other applications:

In addition to the above-mentioned application areas, supercritical carbon dioxide extraction technology has also been applied to many other areas. Such as the cosmetics industry, the preparation of fine particle materials, pesticide residue analysis and precision instrument cleaning. More promising applications are being developed. With the deepening of research on supercritical extraction technology and the continuous improvement of technology, supercritical extraction technology will be more widely used in the future.