The vacuum dryer is to heat and dry the silica gel desiccant material under vacuum conditions. Use a vacuum pump for dehumidification. The drying rate of the material becomes faster, and energy is also saved. Vacuum drying equipment is divided into static dryer and dynamic dryer.
The boiling point of the material solvent in the vacuum state is reduced, so it is suitable for drying unstable or heat-sensitive materials; the vacuum dryer has good sealing performance, so it is also suitable for drying materials that need to be recovered and contain strong irritating and toxic gases. Vacuum drying equipment has been widely used in pharmaceuticals, chemical food, dyes and other industries, and the air meets the requirements of the "GMP" of the drug management standard.
The vacuum dryer has many advantages: the oxygen content is low when drying at low pressure, which can prevent the oxidative deterioration of the dried material, and can dry flammable and explosive dangerous goods; it can vaporize the moisture in the material at low temperature, which is easy to dry heat-sensitive materials ; Can recover precious and useful components in the dried material; can prevent the discharge of toxic and harmful substances in the dried material, and can become an environmentally friendly type of "green" drying. Through these advantages, it can be seen that the application of vacuum drying equipment will become more and more extensive.
The main disadvantage of the vacuum dryer is that it needs a vacuum system that can pump water vapor, which makes the equipment investment and operation cost high; the equipment production efficiency is low and the output is small. Due to these shortcomings, more people with lofty ideals will strive to innovate and improve the vacuum dryer to gradually reduce its shortcomings.
The drop of vapor pressure makes the water (solvent) on the surface of the material reach a saturated state and evaporate, and is discharged and recovered by the vacuum pump in time. The moisture (solvent) inside the material penetrates, evaporates and discharges to the surface from time to time, and the material is in a vacuum state. The three processes are carried out from time to time, and the material achieves the physical and chemical properties of the drying target material in a very short time.
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