Dewatering, drying (in chemistry) - removal of gases, liquids and solids contained in water. Dehydration substances leads to changes in their physical-chemical properties.
Dehydration of gases produced by skipping through concentrated sulfuric acid, absorbing water vapor, or through solid sorbents (calcined chloride calcium, calcium oxide, caustic soda, phosphoric anhydride), pieces of which are filled with special speakers or U-shaped tube. Liquid dehydrate, introducing pieces of fused calcium chloride, calcium oxide, the water-free copper sulfate and other solid substances that bind water.
Dehydration solids reach, and they heat up in the oven, vacuum drying and vacuum executor, exposing infrared rays or soaking in executor over the concentrated sulfuric acid, sodium hydroxide and phosphoric anhydride and other
Dehydration substances undergoing even with moderate heating of irreversible change and decay, produced by the method of lyophilization, which is the removal of water from quickly frozen object in a vacuum. Lyophilization is widely used to obtain capable of long-term storage of blood plasma (dry plasma) and its fractions, immune sera, vaccines, antibiotics, hormones, tissue grafts, dry milk, cream and other Dry preparations obtained by lyophilization, not undergo chemical change and do not lose their inherent properties during long-term storage.