2.2. Materials and apparatus
SASTEC Freeze Dryer was used in the experiment and it was operated at -65ÛC at a vacuum pressure of 1.0
Pascal. The freeze-drying process lasted for 120 hours. Sample are freeze and put into the dryer for about 16 hours.
Spray dryer (Basic Lab Plant)was used in the experiment. The inlet temperature was set up to 170ÛC .There were
two manipulated values for speed of the feed pump which were (2 and 10).The powder produced were collected and
weighed