Streams of Air or Water

Development of a model for predicting the screening performance of a vibrating screen, C1M Bull. 72, 167-171 (Apr. 1979). 

The last of these procedures is in the form of equations suitable for use on a computer. 

Entrainment of particles with streams of air or water is particularly suitable for removal of small particles from mixtures. Complete distribution curves can be development by employing several stages operating at suitable conditions in series. 

---

Method. Take two 20-ml screw-capped glass bottles (McCartney bottles) and to the first add 10 ml of the urine and 3 ml of hydrochloric acid, and to the second add 9 ml of blank urine, 1 ml of the reference solution, and 3 ml of hydrochloric acid. Screw on the caps and heat the bottles in a boiling water-bath for 15 minutes. Cool the solutions, add to each bottle 10 ml of petroleum spirit (b.p. 40°-60°), shake for 5 minutes, and centrifuge. Transfer the solvent layers to 10-ml conical test-tubes, evaporate to dryness under a stream of air or nitrogen, and dissolve die residues in 0.1 ml of methanol. Divide a TLC plate (silica gel G, 250 pm) into two equal columns and apply 50 pi of each exhact to die plate. Develop the plate in a tank containing a 4 1 mixture of chloroform acetone (System TD, p. 168). After development, dry die plate in a stream of cold air. 

Air or water streams — A method of oil containment in which the force of air or water directed as a stream can be used to divert or contain an oil slick. The method can be used to flush oil from beneath docks or to adjust floating booms once they are in place. 

Phthalic anhydride may be separated from the reaction products from the oxidation of naphthalene by a process of sublimation. Water from the reaction and unreacted naphthalene pass over at a lower temperature than the anhydride and may be separated quite completely from it. The anhydride may next be separated from the naphthaquinone and other colored materials which remain in the retort. In this way pure, crystalline phthalic anhydride may be obtained quite readily. The separation by fractionation may also be accomplished by vaporizing the reaction product into a flowing stream of air or cleaned flue gas at a temperature of about 200° C. and then cooling in chambers at successively lower temperatures. 

Magnetic stirrers are available that are either air- or water-driven. They are very simple and rugged. All that is necessary is to connect the inlet to either a stream of air or a water line. Figure 3-20 shows this type. 

Removal of the water by means of a dry stream of air or other gas. The dehydrating action of the various gases is quite specific hydrc en is an especially efficient dehydrating gas [25]. 

---