Application of double cone rotary vacuum dryer

The double cone rotary vacuum dryer is a new type of dryer that combines mixing and drying. The condenser, the vacuum pump and the dryer are matched to form a vacuum drying device. (If the solvent is not needed, the condenser can be used.) The machine is advanced in design, simple in internal structure, easy to clean, all materials can be discharged, easy to operate, and can reduce labor intensity and improve working environment. At the same time, because the material rotates when the container itself rotates, but the material does not accumulate on the wall, the heat transfer coefficient is high and the drying rate is large, which not only saves energy, but also the material is dry and uniform, and the quality is good. Can be widely used in the drying of materials in the pharmaceutical, chemical, food, dye and other industries. Meet the "GMP" requirements.

Generally speaking, in the production of APIs, most of the materials after crystallization need to be separated, dried and mixed. This process is commonly used in the production of APIs. The solid phase material is first separated from the suspension by filtration, and the next process will continue to be refined in the form of vacuum or heat drying. The classic equipment used for this process is a double cone rotary vacuum dryer. Mixing, vacuum drying in one, and being used as a classic device with simplicity, convenience and double-effect characteristics, it is difficult to replace other equipment in terms of its practicability and economy. To this end, the author reviews the structure, principle and characteristics of the double-cone rotary vacuum dryer, and briefly discusses its application in the drug substance and common problems.

The double cone rotary vacuum dryer is mainly used for drying wet materials of powdery, granular and fibrous materials in the pharmaceutical, chemical, food and other industries, and materials similar to biological products requiring low temperature drying. It is more suitable for drying materials required in the following aspects:

(1) Materials requiring extremely low residual volatiles;

(2) Materials requiring recovery of solvents and toxic gases;

(3) Strongly irritating and toxic materials;

(4) heat sensitive materials that cannot withstand high temperatures;

(5) Materials that are easily oxidized and hazardous;

(6) Materials requiring crystal shape.

In the actual application process, due to the different characteristics of the raw materials produced by various manufacturers, the process flow is also different. At present, according to the heating method and solvent recovery status, there are two typical processes: (1) steam heating, no need to recycle solvent process; (2) hot water heating, solvent recovery process

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