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Advantages of freeze drying technology for laboratory freeze dryers

Technical Knowledge 2019-04-18 10:09:52
Drying methods are various, such as drying, boiling, drying, spray drying, and vacuum drying, but ordinary drying methods are usually carried out at temperatures above 0 ° C or higher. The products obtained by drying generally have problems of shrinking size and hardening of the texture. Most of the volatile components are lost, some heat-sensitive substances are denatured and deactivated, and some substances are even oxidized. Therefore, the dried product has a large difference in properties compared with that before drying. The freeze drying technology of the laboratory freeze dryer has the following advantages over the advantages of ordinary drying technology:

1. Many heat sensitive substances do not degenerate or inactivate.

2. When drying at low temperatures, some of the volatile components in the material are lost.

3. During the lyophilization process, the growth of microorganisms and the action of the enzyme cannot be carried out, so that the original trait can be maintained.

4. Since the drying is carried out in a frozen state, the volume is almost constant, the original structure is maintained, and concentration does not occur.

5. Since the moisture in the material exists in the form of ice crystals after pre-freezing, the inorganic salt-soluble substances originally dissolved in the water are evenly distributed in the material. When sublimation, the dissolved substances dissolved in water are precipitated, which avoids the phenomenon that the inorganic salt carried by the internal moisture migration to the surface in the general drying method is precipitated on the surface to cause surface hardening.

6. After drying, the material is porous and spongy. After adding water, the solution dissolves quickly and completely, and the original trait is almost immediately restored.

7. Since drying is carried out under vacuum, there is very little oxygen, so some easily oxidizable substances are protected.

8. Drying can exclude 95%~99% of water, so that the dried product can be preserved for a long time without deterioration.

9. Because the material is in a frozen state, the temperature is very low, so the temperature of the heat source for heating is not high, and the heater with normal temperature or low temperature 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 is not much heat loss, so the utilization of heat energy is economical.

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