Sodium sulfate (sulfate of soda , Na2SO4). The largest use is as filler in powdered home laundry detergents. It can also be used to add strength and toughness to paper and to make glass. During the drying process the bed temperature is uniform and the drying takes place at relative low temperatures. The fluidized bed drying is known as a drying method capable of efficiently reducing moisture content of the Sodium Sulfate. This technique is characterized by being applicable to highly moist materials and proper thermal control due to mixing the drying materials.