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US 5,296,006 AGranted
3-acrylamido-3-methylbutanoic acid copolymers as selective coal flocculants
AssigneeNalco Chemical Company
InventorsPeter E. Reed, Ram-Aiyangar Venkatadri, Lawrence J. Connelly
Life of this patent
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Abstract
3-acrylamido-3-methylbutanoic acid copolymers of acrylamide or acrylic acid are selective flocculant for coal present in coal refuse slurries.
Claims4
A process for flocculating a coal refuse slurry with a water soluble polymeric flocculant to separate gangue from the coal, the improvement which comprises using as the flocculant a copolymer containing from 1-40 mole percent of 3-acrylamido-3-methyl butanoic acid with acrylamide or acrylic acid wherein the copolymers have an RSV measured as a 0.045 weight % copolymer solution in a 0.1M sodium nitrate solution of at least 15 dl/g.
Dependencies are inferred from the claim text.