Abstract
In this study, a novel environmentally friendly copolymer acrylic acid-itaconic acid-allylpolyethoxy maleic carboxylate was synthesized and used for inhibiting the calcium sulfate dehydrate (gypsum) scale. The properties of the synthesized copolymer were characterized by Fourier-transform infrared, nuclear magnetic resonance spectroscopy and thermal gravity analysis. Also, the structure and morphology changes of scale crystals were studied by scanning electronic microscopy, transmission electron microscopy and X-ray powder diffraction analysis. The copolymer inhibition ability was evaluated by means of static scale inhibition experiments. Results show that the copolymer was effective in inhibiting the scales by changing the size and morphology of the crystals. The maximum inhibition efficiency was 99.8% at a concentration of 2 mg · L–1, far more efficient than most commercial inhibitors.
Kurzfassung
In dieser Untersuchung wurde ein neues, umweltfreundliches Copolymer aus Acrylsäure-Itaconsäure-Allylpolyethoxymaleinsäurecarboxylat synthetisiert und zur Inhibierung von Kesselstein aus Calciumsulfatdehydrat (Gips) eingesetzt. Die Eigenschaften des synthetisierten Copolymers wurden mittels Fourier-Transformations-Infrarot-Spektroskopie, Kernresonanzspektroskopie und der Thermogravimetrie bestimmt. Struktur- und Morphologieänderungen der Kesselsteinkristalle wurden mit der Rasterelektronenmikroskopie, der Transmissions-Elektronenmikroskopie und der Röntgenbeugungsanalyse ermittelt. Die inhibierende Eigenschaft des Copolymers wurde mittels statischer Inhibierungsexperimente beurteilt. Die Ergebnisse machen deutlich, dass das Copolymer die Kesselsteinbildung effektiv inhibiert, indem Größe und Morphologie der Kristalle verändert wurden. Die maximale inhibierende Wirkung betrug 98,8% bei einer Copolymerdosierung von 2 mg L–1. Sie war deutlich effizienter als die der meisten kommerziellen Inhibitoren.
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