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Fluidizable particulate materials and methods of making same

United States Patent

5,972,835
October 26, 1999
View the Complete Patent at the US Patent & Trademark Office
The invention provides fluidizable, substantially spherical particulate material of improved attrition resistance having an average particle size from about 100 to about 400 microns useful as sorbents, catalysts, catalytic supports, specialty ceramics or the like. The particles are prepared by spray drying a slurry comprising inorganic starting materials and an organic binder. Exemplary inorganic starting materials include mixtures of zinc oxide with titanium dioxide, or with iron oxide, alumina or the like. Exemplary organic binders include polyvinyl alcohol, hydroxypropylemethyl cellulose, polyvinyl acetate and the like. The spray dried particles are heat treated at a first temperature wherein organic binder material is removed to thereby provide a porous structure to the particles, and thereafter the particles are calcined at a higher temperature to cause reaction of the inorganic starting materials and to thereby form the final inorganic particulate material.
Gupta; Raghubir P. (Durham, NC)
Research Triangle Institute (Research Triangle Park, NC)
08/ 711,877
September 12, 1996
This invention was made with Government Support under Contract No. DE-AC21-88MC25006 awarded by the United States Department of Energy. The Government has certain rights in this invention.