Sl. No | Spray drying | Freeze drying |
---|---|---|
Advantages | ||
1 | Rapid drying process | Minimum damages to the product |
2 | Directly convert the dried powder from the liquid feed | Freeze dried powder can be stored in atmospheric conditions |
3 | Easy to change the process variables and improve the product quality | Retain the aroma, flavor and nutritional content |
4 | Products in free-flowing powders | Porous structured powder due to sublimation of water |
5 | High production efficiency | Â |
6 | Less operator requirement | Â |
7 | Scaleup to large production capacity | Â |
Disadvantages | ||
8 | May not suitable for heat sensitive materials | Lengthy drying time [24 – 36 h] |
9 | Complex equipment, and requires more area for installation | Complex equipment and difficult to change the process |
10 | High capital and maintenance cost | High capital and maintenance cost |
11 | Less thermal efficient | Less thermal efficient |