Anionic polymers produced by the copolymerization of acrylamide and acrylic acid work very well as Flocculants.
These can be employed in the thickening of mining sludges, as well as potable water and the clarification of sugar liquors. These polymers tend to have several anionic acrylate groups close together and adhere well to inorganic substrates. The “same” polymer can also be made by producing a polyacrylamide and then hydrolyzing it with sodium hydroxide. These “partially hydrolyzed polyacrylamides” (PHPA) have the charges more evenly spaced along the chain. As such they provide a viscosity which is about 50 per cent higher. PHPAs are also more thermally stable, which is important when injecting into deep wells. Such polymers work very well as pushing fluids to recover oil. The difference between the viscosities of copolymers and hydrolyzed homopolymers is shown in the figure above.
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