FREEZE DRYING PROCESS: A REVIEW

Among the various methods of drying, this article has mentioned only one most important method, Freeze drying. This method is mainly used for the drying of thermo labile materials. This method works on the principle of sublimation. This method is divided into 3 steps for its better understanding; these are Freezing, Primary drying, and secondary drying. There are many advantages and disadvantages of this method, but still this is the most useful drying method nowadays.