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898,092. Contacting a liquid with a fluid of less density. ALUMINIUM LABORATORIES Ltd. July 20, 1959 [July 29, 1958], No. 24884/59. Class 55 (2). In a method of contacting a liquid with a fluid of less density and not wholly miscible therewith, the fluid is passed upwardly in a vessel 10 from an inlet 17 to an outlet 22 through a bed of floating buoyant elements 27 arranged between grids 13 and 16 and wetted by liquid from pipe 20. The vessel 10 may contain more than one bed of buoyant elements and the buoyant elements are preferably spherical or spheroidal and may suitably be table-tennis balls, balls of foamed plastics with an impervious external surface or hollow metal spheres. The spheres used may be between “ inch and 3 inches in diameter, preferably between 1 inch and 2¢ inches, and preferably have a density of 1¢ to 11 pounds per cubic foot. In an example of washing a gas with a liquid, the gas velocity was 600 foot per minute and the buoyant elements were spheres of 1¢ inches diameter weighing about 5.5 gms. apiece.
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