1. purpose and significance
Supercritical fluid extraction technology is one of the most advanced separation and extraction technology in the world. In recent decades, it has aroused great interest of researchers all over the world. In the fields of medicine, chemical industry, food, petroleum, environmental protection, cosmetics and other fields, a number of valuable topics have been completed, and a new industry has been formed all over the world. The development and utilization of supercritical fluid extraction technology to achieve large-scale industrial production is a major breakthrough for the majority of Chinese researchers to transform dozens or hundreds of scientific research results that have been developed in the laboratory into productivity and economic benefits.
Overview of 2. Development at Home and Abroad

Supercritical fluids have special dissolving power that was not discovered by Americans in the 19th century. It was not until the 1970 s that the German people applied to industrial applications such as wine processing to extract wine. In the 1980 s, China and Japan started at the same time, and now Japan's industrial application has led the world. China started in the 1980 s, and many scientific research institutes have made active efforts to explore and practice, and have achieved many results. For example: capsicum red pigment, angelicae angelicae oil, garlic oil, shikuson red pigment, pepper oil, lecithin and so on no less than a few hundred kinds, but mostly in the laboratory results. At present, there are several domestic manufacturers that can produce supercritical equipment (from one to two hundred liters), which can only be satisfied with the extraction of laboratories and some more expensive products, and from the current domestic research results and needs, It is far from meeting the needs of large-scale industrial production.
3. Why China Should Industrialize in the Field of Supercritical Extraction
my country is a country rich in natural resources of animals and plants. Many resource varieties and quantities rank among the top in the world. Natural pigments, flavors, and cosmetics are all precious watch resources for human survival and prosperity. Due to the backwardness of China's deep processing technology, especially in some economically underdeveloped areas, many valuable natural resources are wasted or exported cheaply as raw materials, and then sold back to China at a high price after deep processing by foreign countries, such as wine industry, tea industry, pigment flavor, etc. The comprehensive utilization of various wastes such as peels and kernels, the westernization of herbal medicines and the integration of the international herbal medicine market are in urgent need of large-scale supercritical extraction equipment, which will turn cheap natural resources in poor areas into high value-added green products.
Four. Obstacles to industrialization At present, due to the difficult processing technology of large-scale extraction kettles in China, the volume of supercritical extraction equipment produced is relatively small, and the extraction of some relatively light substances has disadvantages such as high cost, high cost, and no processing capacity. From the research results, domestic equipment cannot meet the industrial production needs of many industries, while domestic enterprises that need large-scale industrial extraction equipment should be more than 100, the introduction of such large equipment, its price is very expensive. This hinders the wide application of supercritical extraction technology in our country. At the same time, the standardization of equipment and the safety of supporting equipment are all issues that need to be solved urgently at present. After one year's efforts, we have finally successfully developed a large-scale supercritical extraction equipment of 100 liters to 2,000 liters, which can meet the requirements of extraction technology in terms of pressure, temperature and flow rate, and the cost of this equipment only needs 30% of imported equipment. It has reasonable structure, superior performance, and conforms to the sanitary conditions of the food industry. At the same time, it is superior to similar equipment at home and abroad in temperature sensing, fatigue dynamic strength, sealing performance, safety factor and other technical indicators. After more than two years of testing, the equipment runs well. The products produced are: Angelicae sinensis oil, Duhuo oil, Arnebiae red pigment, Changbai mountain forest frog seed oil, sea rainbow oil, ginseng oil, Schisandra oil, safflower oil, hop oil, garlic oil, ginger oil, aloin, Kunming pyrethrum and other dozens of varieties, but also from ginseng powder to remove 80% of pesticide residues.