In general, the extract contains a considerable amount of plant waxes, pigments, etc. At room temperature, the extracts are in the form of waxy solids, sometimes with the precipitation of crystalline substances, and are not completely soluble in ethanol. Among the many extract products, the market and demand of traditional Chinese medicine extracts are gradually expanding and improving.
The so-called Chinese medicine extract is a Chinese herbal ingredient that has been steamed, boiled or formed into an extract. However, with the rising demand for extracts of traditional Chinese medicine, its drying problems have also become complicated and become a major problem for the equipment industry. It is reported that in the past drying of traditional Chinese medicine extracts used vacuum drying equipment and microwave dryer, the relevant experts said that the two types of equipment, small output, long drying time, and the dry products formed are cake-like, but also need to crush, sieve Such processes are cumbersome and require a lot of manpower and resources.
However, in order to better dry the Chinese herbal extracts, some dry pharmaceutical equipment companies have made equipment improvements, and developed and produced centrifugal spray dryers for herbal extracts. It is reported that the special centrifugal spray dryer has changed in the process operation, and there has been significant reform in the host structure.
Before using a special centrifugal spray dryer for Chinese herbal extracts, the author learned that the sticky wall of the material often appears during the drying process of Chinese herbal extracts, and the rate of powder collection is low; the material stays on the wall for a long time, resulting in coking and deterioration of the material. There is also a situation where it is difficult to clean and the output is low. However, some pharmaceutical equipment companies upgraded the process and performance of centrifugal spray dryers through process improvements and upgrades.
According to a company that develops and manufactures centrifugal spray dryers, they pass the dehumidified cold air to the tower body in the lower part of the equipment cone, and make a counter flow to the material, so that the dried hot material exchanges heat with cold air. And the temperature of the material is reduced below the softening point of the material to avoid the softening and stickiness of the material. The dried material will be discharged from the bottom of the tower. The exhaust gas will be evenly discharged around the cylinder and cone joint of the main tower. A small amount of material entrained in the exhaust gas will be collected and discharged by the cyclone separator.
There are also equipment companies in accordance with the material properties of Chinese herbal extracts and technological requirements to ease the difficulties of Chinese herbal extract dryer, dried material color is good, not bad, greatly improving the economic efficiency of pharmaceutical companies. The person in charge of the relevant company stated: "The Chinese Herbal Extract Centrifugal Spray Dryer, which was developed by us, adopts three-stage air purification to achieve an inlet air requirement of 300,000 grades; it also uses a cold wall device to allow the inner wall temperature to reach 80°C and the material is in the wall. Stay on the coke."
The responsible person also stated that the Chinese medicine extract centrifugal spray dryer also has a flushing device, which is suitable for the production requirements of many varieties. The wet dust removal system will make the dust free from going out and meet the environmental protection requirements. In addition, the equipment is equipped with an air-sweeping device, which can also be sealed and sealed with dry air.
In addition to the process, there are also equipment companies that innovate from the structure. For example, increase the diameter of the upper end of the cone, insert the cylinder into the cone, and connect the ring with the screw. The improved equipment has evenly distributed four exhaust outlets, which can make the distribution of exhaust and pressure in the tower more uniform; the wind speed at the upper end of the cone is reduced, which facilitates the settlement of the material, reduces the material in the exhaust gas, and improves the cyclone. Separation efficiency of the separator; the elimination of the exhaust duct in the cone reduces the possibility of material accumulation and gives a reliable guarantee of product quality.
Whether it is a process or a structure, pharmaceutical equipment companies are striving to make breakthroughs in solving the Chinese herbal extract problem. The process and structural improvement of the centrifugal spray dryer is a good proof. The equipment provides a good choice for the drying of extracts in Chinese medicine preparations, and also lays a solid foundation for the subsequent development of Chinese herbal extracts and equipment.
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