Application of Centrifugal Extraction Machine in the Field of Chinese Medicine Extraction

Traditional Chinese medicine is an indispensable part of China's medical treasure house and has played an important role in the historical process. For a long time, the reasons for the backwardness of production technology, technology and equipment have greatly limited the process of modernization of traditional Chinese medicine. The rapid advancement of science and technology has brought good opportunities for the development of traditional Chinese medicine. The application of modern scientific and technological means to study traditional Chinese medicine is an inevitable way for its development. Improve the quality of traditional Chinese medicine, organically combine traditional Chinese medicine industry and modern medical technology to promote its entry into the international market. The extraction and separation process of active ingredients of traditional Chinese medicine is the key link, and centrifugal extraction machine is one of the important extraction and separation equipment.

Liquid-liquid extraction (solvent extraction) is a rapidly evolving separation technique that selects the appropriate extractant and process for the subject and requirements of the separation. It has been widely used in biological and pharmaceutical engineering, Chinese medicine extraction, pesticides, biology and other industries, replacing the extraction equipment such as extraction tanks, extraction towers and extraction tanks in traditional processes.

The centrifugal extractor is a fast and efficient liquid-liquid extraction (solvent extraction) device that uses centrifugal force to extract and separate liquid-liquid two phases. The device can realize various functions such as liquid-liquid two-phase mixing, mass transfer, reaction, extraction, washing and separation.

Centrifugal extraction machines use the principle of centrifugal sedimentation to separate materials with poor density. Therefore, in the liquid-liquid extraction (solvent extraction) process, the requirements for the raw material liquid are as follows: (1) the two are incompatible with each other; (2) the difference in density between the two phases is at least 0.1 or more; (3) separation The liquid should not contain large solids (allowing a small amount of solid particles to appear).

In the extraction of traditional Chinese medicine, the nature of the raw material liquid, the high-speed agitation of the centrifugal extractor, the temperature change and other factors are solid precipitation and emulsification in the material system, resulting in decreased extraction efficiency, poor separation effect, reduced production, and equipment maintenance. Problems such as increased costs.

According to relevant literature reports, Chinese medicine extraction is still one of the bottlenecks in the modernization of Chinese medicine. At present, the world market of natural botanical medicines has reached 30 billion US dollars, and it is growing at a rate of 20% per year. It is likely to grow rapidly to more than 100 billion US dollars in recent years. In 2003, plant extracts accounted for an increase in the export share of traditional Chinese medicine products. 30.16%, which has surpassed proprietary Chinese medicines, has become the second largest category of Chinese herbal medicine exports. The field of plant extraction has great potential for development and has a promising future. Extraction methods with low investment, low production cost and high safety are more and more important. In the next few years, the variety and quantity of plant extracts will increase greatly. There will be an order of magnitude leap in ten years. It is of unusual significance to explore the use of continuous extraction processes to improve processing capacity and yield and reduce production costs.

As a special equipment for extraction, the centrifugal extractor can accelerate the sedimentation and stratification by using centrifugal force, so that the agitation is intensified to make the droplets finely crush, thereby enhancing the extraction operation. Centrifugal extractors are classified into two types: graded contact and differential contact. The former is equipped with a stirring device in a centrifugal separator to form a single-stage or multi-stage centrifugal extractor, and has a Louis Vesta type and a cylindrical centrifugal extractor. The latter drum is equipped with a multi-layer concentric cylinder, and the wall of the cylinder is opened to make the liquid have a film-like and droplet-like dispersion, such as a Pod Bilne centrifugal extractor. The centrifugal extractor is particularly suitable for systems with low density or easy emulsification of two phases. It is also suitable for the extraction of substances with unstable chemical and physical properties due to the short residence time of the materials in the machine.

The CWL centrifugal extractor developed by our company combines the advantages of various centrifugal extractors. Compared with other centrifugal extractors, the power consumption is greatly reduced, and the corrosion resistance and stability are more reliable. Because it is a sealed design, it gets rid of the problem of large noise and leakage of the centrifugal centrifugal extractor. Under the working condition of the machine, the noise is almost inaudible.

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