ABSTRACT

The Effect of Heat on the Active Constituents of a Solution. The thermal stability of components of a solution may determine the type of evaporator to be used and the conditions of its operation. Distillation is a process in which a liquid mixture is separated into its component parts by vaporization. General principles of the supply of air in pharmaceutical processes are similar to conventional air conditioning. The control of its quality, however, may be more stringent. Granular beds, fibrous media, and ‘‘absolute filters’’ prepared from cellulose and asbestos are used for high-efficiency air filtration. The term ‘‘fluidization’’ is applied to processes in which a loose, porous bed of solids is converted to a fluid system, having the properties of surface leveling, flow, and pressure-depth relationships, by passing the fluid up through the bed. The theoretical strength of crystalline materials can be calculated from interatomic attractive and repulsive forces.