The double cone rotary vacuum dryer is a drying device that integrates mixing and vacuum drying. The process of vacuum drying is to place the material to be dried in a sealed cylinder, and vacuum the vacuum system to continuously heat the material to be dried, so that the moisture inside the material diffuses to the surface through pressure difference or concentration difference, water molecules (or other The non-condensable gas) obtains sufficient kinetic energy on the surface of the material, diffuses into the low pressure space of the vacuum chamber after overcoming the mutual attraction between the molecules, and is evacuated by the vacuum pump to complete the separation from the solid. Therefore, the double cone rotary vacuum dryer exhibits the following characteristics:
(1) During the vacuum drying process, the pressure in the cylinder is always lower than the atmospheric pressure, the number of gas molecules is small, the density is low, and the oxygen content is low, so that the medicine which is easy to oxidize can be dried, and the chance of contamination of the material is reduced.
(2) Since the moisture content is proportional to the steam pressure during the vaporization process, the moisture content in the material can be vaporized at a low temperature during vacuum drying to achieve low temperature drying, and is particularly suitable for the production of a drug having heat sensitive materials.
(3) Vacuum drying can eliminate the surface hardening phenomenon easily caused by atmospheric hot air drying. This is because the pressure difference between the vacuum drying material and the surface is large. Under the pressure gradient, the moisture quickly moves to the surface without surface. hardening.
(4) Due to the small temperature gradient between the inside and outside of the material during vacuum drying, the moisture can be moved and collected by itself due to the reverse osmosis, effectively overcoming the dispersion caused by hot air drying.
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