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What are the advantages of a laboratory freeze dryer used in a laboratory over conventional methods?
The laboratory freeze dryer uses the physical principle to freeze the moisture in the compressed air to below the dew point, so that it can be precipitated from the air.
The humid and high-temperature compressed air flows into the pre-cooler (for high-temperature type only), and then flows into the heat exchanger to exchange heat with the cold air discharged from the evaporator to reduce the temperature of the compressed air entering the evaporator.
After the heat exchange, the compressed air flows into the evaporator and exchanges heat with the refrigerant through the heat exchange function of the evaporator. The heat in the compressed air is taken away by the refrigerant, and the compressed air is rapidly cooled. The condensed water forms water droplets after condensing. After the unique air-water separator rotates at high speed, the water is separated from the air due to the centrifugal force. After separation, the water is discharged from the automatic drain valve. The dew point of the air pressure after cooling is as low as 2 ° C.
The cooled cold air flows through the air heat exchange to exchange heat with the hot and humid hot air at the inlet. The cold air that has been heat exchanged increases the temperature by absorbing the heat of the inlet air, and the compressed air also passes through the secondary condenser of the refrigeration system. The heat exchange with the high-temperature refrigerant again heats the outlet temperature sufficiently to ensure that the outlet air line does not dew. At the same time, the cold source of the outlet air is fully utilized to ensure the condensation effect of the refrigeration system of the machine and the quality of the air at the machine outlet.
Compared with the conventional method, the laboratory freeze dryer used in the laboratory has the following advantages:
1 Many heat-sensitive substances do not denature or deactivate.
2 When drying at low temperature, some volatile components in the substance are lost very little.
3 During the lyophilization process, the growth of microorganisms and the action of enzymes cannot be performed, so the original properties can be maintained.
4 Because it is dried in a frozen state, the volume is almost unchanged, the original structure is maintained, and no condensation occurs.
5 Because the water in the material exists in the form of ice crystals after pre-freezing, the inorganic salt-soluble substances originally dissolved in water are evenly distributed among the materials. During sublimation, dissolved substances dissolved in water are precipitated, which avoids the phenomenon of surface hardening caused by the precipitation of inorganic salts carried on the surface due to the internal moisture migration of the material to the surface in the general drying method.
6 After drying, the material is loose and porous and sponge-like. After adding water, it dissolves quickly and completely, and the original properties are restored almost immediately.
7 Since the drying is performed under vacuum, there is very little oxygen, so some easily oxidizable substances are protected.
8 Drying can remove more than 95% ~ 99% of moisture, so that the product can be stored for a long time without deterioration.
9 Because the material is frozen and the temperature is very low, the temperature of the heat source for heating is not high. Normal temperature or low temperature heater can meet the requirements. If the freezing chamber and the drying chamber are separated, the drying chamber does not need to be insulated, and there will not be a lot of heat loss, so the use of thermal energy is very economical.
