First of all, the process of vacuum drying, double cone rotary vacuum dryer cylinder pressure is lower than the atmospheric pressure, less number of gas molecules, low density, low oxygen content, thus drying easy oxidation of drugs, reduce material contamination opportunity. Secondly, because the water in the vaporization process temperature and steam pressure is proportional to, so the vacuum drying, the moisture content of materials at low temperature vaporization can, achieve low-temperature drying, especially suitable for heat sensitive materials and drug production.
Furthermore, vacuum drying can eliminate surface hardening phenomenon caused by the atmospheric pressure hot air drying, this is because the material of vacuum drying and surface pressure, the pressure gradient effect, water quickly move to the surface, no surface hardening.
Finally, because the vacuum drying, the material between the internal and external temperature gradient is small, the reverse osmosis the solvent alone could move and collection, overcome the phenomenon of hot air drying solvent separated from. To sum up, double cone rotary vacuum dryer is a kind of pressure vessel, in the process of vacuum drying, the drying chamber double cone rotary vacuum dryer is negative pressure. Want a little content today I bring can be useful to you. |
