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Measurements of total pressure drop and static pressure drop in t h e transport of solid particles through vertical 0.267and 0.532-inch inside diameter glass tubes by an air stream are reported. Closely sized sand (28t o 35-, 35-to48-,48-t060-, and60-to80-meshTyler),and bothground and spherical silica-alumina cracking catalyst were used. Solids circulation rates ranged from 2 to 54 pounds per second per square foot a t various constant air rates fromConverting to inches of water and substituting G8/uI for p d s ,

The commercial possibilities of crystallization of inorganic salts by means of organic precipitante are being investigated. Since solubility cannot be predicted accurately, experimental data are necessary in order to permit technical and economic consideration of such a process.Solubilities and saturated solution densities are reported at intervals of 5°from 25°to 75°C. for potassium and ammonium nitrates in aqueous isopropanol solutions. Separation into two liquid phases occurs over part of the concentration and temperature range in the case of both systems.

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