The special spray dryer for traditional Chinese medicine formula granules is to pass the solution, slurry or suspension through a sprayer to form fine mist droplets and disperse them in the hot air flow, so that the moisture can be quickly vaporized to achieve the purpose of drying. The hot air flow and the material can be contacted by co-current, counter-current or mixed flow.
This drying method does not require mechanical separation of raw materials in advance, and the drying time is very short (usually 5-30s), so it is suitable for drying heat-sensitive materials, such as traditional Chinese medicine extracts. The spray dryer is also faced with a big problem in the aspect of traditional Chinese medicine extract, that is, the phenomenon of sticking to the wall and the dry product easily absorbs moisture during the drying process, and it is difficult to handle the high concentration and high viscosity traditional Chinese medicine extract.
Studies have shown that the softening point of traditional Chinese medicine extract is lower than the inlet air temperature of spray drying is the main reason for the sticking phenomenon. By adding auxiliary materials to improve the softening point of the extract, the sticking phenomenon can be eliminated, but adding auxiliary materials may affect the purity of the product. . In addition, another disadvantage of spray drying is that the product recovery rate is lower than that of drying technology, and the industry and enterprises should pay attention to this.
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