Application of spray dryer in pharmaceutical industry

For many TCM, drying is an essential process and has a good effect on the efficacy of TCM. Spray dryer is used to disperse into small liquid droplets, which are fully in contact with hot air to complete constant temperature drying and obtain powder products, which can prevent materials from coking, caking or sticking to the wall.

Spray dryer can directly obtain drying products from the material liquid, eliminating unit operations such as evaporation, crystallization, separation and crushing, continuous automatic production, stable operation. Using this drying method, the dryer gas-solid two phase contact surface area is large, the drying time is short, the general drying time is 5-30s, suitable for heat sensitive materials drying. After drying, the product is of good quality, and particles of 30-50μm can be obtained. The product has good fluidity and instantaneous solubility.

Advantages of spray dryer:
1, fast drying speed, with instantaneous drying characteristics.
2. In the drying process, the droplet temperature is relatively low, which is especially suitable for the drying of heat-sensitive substances and can keep the color, fragrance and taste of materials.
3, the spray dryer has a special structure to prevent the drying tower from sticking to the wall, which can effectively prevent the product from sticking to the wall.
4. In order to protect the material from pollution and extend the service life of the equipment, all parts in contact with the material should be made of stainless steel. For easy operation, the control system adopts integrated operation.
5, because the drying process is completed in an instant, the product particles basically keep the spherical droplet, with good dispersion, fluidity and solubility.
6, dryer speed, atomized material liquid specific surface area greatly increased, in the process of contact with hot air, 95%-98% of the water can evaporate instantly, drying time is only a few seconds, especially suitable for the drying of thermal sensitive materials.
7, spray dryer has good uniformity, fluidity and solubility.
8, simple production process, easy operation and control, water content of 40-60% of the liquid, can be dried into powder products, dry without grinding and screening, reduce the production process, improve the purity of the product.

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