Abstract
Novel homopolymer and copolymer scale inhibitors with iminodiacetic acid chelating units were synthesized for inhibiting calcium carbonate and calcium sulfate precipitation. Static scale inhibition tests of SI-1 demonstrated excellent performance, with inhibition performance of 83 % at a concentration of 30 mg/L for CaCO3 and >99 % at a concentration of 8 mg/L for CaSO4. These novel inhibitors surpassed the performance of a commercially available industrial scale inhibitor, 2-phosphonobutane-1,2,4-tricarboxylic acid. The homopolymer significantly altered CaCO3 and CaSO4 crystal structures and reduced crystal size at low concentrations. The primary mechanism of inhibition appears to be a two-fold effect: strong and specific complexation between the iminodiacetic acid chelating units and free Ca2+ ions, coupled with the adsorption of the polymers on the crystal surfaces. These promising scale inhibitors offer a potential replacement for phosphorus-containing compounds currently used in industrial applications.
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