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Performance comparison of new "green" scale inhibitor and traditional scale inhibitor in calcium sulfate scaling

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Document pages: 10 pages

Abstract: The relative ability of industrial samples of four phosphorus free polymers (polyaspartate (PASP), polyepoxysuccinate (PESA), polyacrylic acid sodium salt (PAAS), maleic acid and acrylic acid copolymer (MA-AA)) and three phosphonates (Aminotris (methylphosphonic acid), ATMP, 1-hydroxyethane-1,1-bis (phosphonic acid) according to NACE standard, combined with dynamic light scattering (DLS) The inhibition of butane-1,2,4-tricarboxylic acid phosphate (PBTC) on calcium sulfate precipitation was studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD). For the dose of 0.5   mg · DM − 3, the following efficiency ranking was found: ≫. These isolated crystals were identified as gypsum. The SEM images of PESA, PASP, PAAS, HEDP and blank samples showed needle crystal morphologylogy. Surprisingly, the least effective reagent PBTC revealed quite a different behavior, changing the morphology of gypsum crystals to an irregular shape. The DLS experiments exhibited a formation of 300 to 700 nm diameter particles with negative ζ-potential around −2 mV for all reagents. Although such ζ-potential values are not capable of providing colloidal stability, all three phosphonates demonstrate significant gypsum particles stabilization relative to a blank experiment.

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