Filtration aids for removal of calcium solids from aqueous phosphoric acid
AssigneeNalco Chemical Company
InventorsRalph W. Kaesler, Donald G. Robinson, Wayne L. Moss, Brian K. Failon
Life of this patent
Estimating the term…
Abstract
Separation of gypsum from phosphoric acid liquor produced during the production of phosphoric acid from finely ground phosphate rock. These aids are characterized as containing sulfonate and acrylamide.
Claims5
A method for increasing the filtration rate for the removal of gypsum and gangue from phosphoric acid in a phosphoric acid production facility comprising the addition of a sulfonated acrylamide polymer containing at least about 1 mole percent sulfonate and having an RSV of at least 10, sulfonated polymer being selected from the group consisting of 2-acrylamido-2-methlpropanesulfonate/acrylamide, 2-acrylamido-2-methylpropanesulfonate acrylate/acrylamide and 2-acrylamidoethanesulfonate/acrylate/acrylamide.
Dependencies are inferred from the claim text.