U.S. patent number T980,005 [Application Number 05/850,588] was granted by the patent office on 1979-03-06 for granulation and coating by improved method of heat removal. This patent grant is currently assigned to Tennessee Valley Authority. Invention is credited to Arthur R. Shirley, Jr..

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United States Patent	T980,005
Shirley, Jr.	March 6, 1979

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Granulation and coating by improved method of heat removal

Abstract

an improved process for the granulation or coating of hygroscopic or nonhygroscopic materials where melt is sprayed onto cascading granules of common or uncommon substrate in an enclosed vessel such as a rotary drum preferably with lifting flights which provide maximum mixing of the granules and the atmosphere enclosed in the unit and where heat given off by solidification of the melt is absorbed by evaporation of water which is atomized as an extremely fine mist into areas of the vessel which are not subtended by falling granules. Evaporation is effected without impingement of the mist on the granules or vessel internals. Air for evaporation is pulled through the vessel concurrent with the flow of granules and its moisture content is regulated below the critical humidity of the granules throughout the vessel. Some recycle of undersize granules discharged from the vessel is maintained for size control; however, examples show the recycle rate decreased by 87 percent over recycle cooled processes as 73 percent of the heat evolved is removed by evaporation of water mist. An equation is developed which mathematically represents the thermodynamics of the process and specific values are presented for variables when granulating sulfur or urea.

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Inventors:	Shirley, Jr.; Arthur R. (Florence, AL)
Assignee:	Tennessee Valley Authority (N/A)
Family ID:	25308571
Appl. No.:	05/850,588
Filed:	November 11, 1977

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Current U.S. Class:	264/7; 264/14
Current CPC Class:	B01J 2/006 (20130101); B01J 2/12 (20130101); C05C 9/005 (20130101); C01B 17/0248 (20130101); C01B 17/0237 (20130101)
Current International Class:	B01J 2/12 (20060101); B01J 2/00 (20060101); C05C 9/00 (20060101); C01B 17/00 (20060101); C01B 17/02 (20060101); B01J 002/02 ()

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