The vacuum freeze dryer is suitable for the drying of high-grade raw materials, Chinese herbal medicines, biological, dehydrated vegetables, chemicals, pharmaceutical intermediates and other materials. It can be seen that it is widely used in the pharmaceutical industry. The advantage of vacuum freeze-drying is that it can reduce the possibility of oxidative deterioration of the material, eliminate the bacteria in the material, and ensure the quality; the original shape of the material can be well retained.
After the vacuum freeze-drying equipment is turned on, the materials are put into the material box for freezing. The freezing process of the materials. On the one hand, the vacuum system carries out vacuum to remove a part of the water; on the other hand, when the material is frozen, the moisture in some molecules is discharged to the surface of the material to freeze. After the freezing requirement is reached, the heating system heats the material. Drying, the water contained in the material is brought to the freezing trap box by vacuuming to achieve the requirement of freeze-drying of the material.
When the equipment is lyophilized, it is necessary to maintain the excellent quality of the product and to achieve a faster drying rate. The latent heat required for sublimation must be transferred from the heat source to the surface of the material to be dried through an external heat transfer process, and then transferred to the actual occurrence of ice sublimation in the material through an internal heat transfer process. The water vapor produced must pass through the internal mass transfer process to the surface of the material and then transferred to the steam trap (cold trap) by an external mass transfer process.
Any process or processes together can become a "bottleneck" in the drying process, depending on the design of the lyophilization equipment, the operating conditions, and the characteristics of the material being dried. Only by simultaneously increasing heat transfer, mass transfer efficiency, and increasing the surface area per unit volume of lyophilized material can a faster drying rate be achieved.
After the vacuum freeze-drying equipment is turned on, the materials are put into the material box for freezing. The freezing process of the materials. On the one hand, the vacuum system carries out vacuum to remove a part of the water; on the other hand, when the material is frozen, the moisture in some molecules is discharged to the surface of the material to freeze. After the freezing requirement is reached, the heating system heats the material. Drying, the water contained in the material is brought to the freezing trap box by vacuuming to achieve the requirement of freeze-drying of the material.
When the equipment is lyophilized, it is necessary to maintain the excellent quality of the product and to achieve a faster drying rate. The latent heat required for sublimation must be transferred from the heat source to the surface of the material to be dried through an external heat transfer process, and then transferred to the actual occurrence of ice sublimation in the material through an internal heat transfer process. The water vapor produced must pass through the internal mass transfer process to the surface of the material and then transferred to the steam trap (cold trap) by an external mass transfer process.
Any process or processes together can become a "bottleneck" in the drying process, depending on the design of the lyophilization equipment, the operating conditions, and the characteristics of the material being dried. Only by simultaneously increasing heat transfer, mass transfer efficiency, and increasing the surface area per unit volume of lyophilized material can a faster drying rate be achieved.
Zhejiang Industrial Group Co., Ltd. , https://www.xingyeseafood.com