Cephalexin is a commonly used antibiotic drug, which needs to be dried during the production process to remove water and ensure product quality and stability. Disc dryer is a kind of equipment suitable for drying a variety of materials, and its working principle and characteristics are as follows:
The wet material is continuously added to the first layer of drying plate in the dryer through the feeder, and the material is subjected to the turning effect of the rake blade in rotary motion on the drying plate.
The material flows along the exponential spiral across the surface of the drying tray, and the material on the small drying tray is transferred to the outer edge and falls from the outer edge into the outer edge of the large drying tray below.
On the large drying plate, the material moves inward and falls into the next layer of small drying tray from the middle blanking port, and the large and small drying trays are arranged alternately up and down, so that the material can flow continuously through the entire dryer.
Heating medium, such as saturated steam, hot water or heat transfer oil, is introduced into the drying tray to heat and dry the material. The heating medium enters from one end of the drying tray and exits from the other end.
The dried material falls from the last drying tray to the bottom layer of the shell, and is finally transferred to the discharge port by the rake blades.
The moisture escapes from the material and is discharged through the moisture exhaust port, and the moisture from the vacuum disc dryer is extracted from the vacuum pump port.
By adding fin heater, solvent condenser, bag filter, dry material backmixing mechanism, induced draft fan and other auxiliary equipment, its drying production capacity can be improved, solvent can be easily improved, and pyrolysis and reaction operations can be carried out.
In summary, cephalexin can be dried using a disc dryer, which is suitable for large-scale production with high production efficiency and low energy consumption. In addition, the drying process can be further optimized and the production capacity can be increased by adding auxiliaries.