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| Comparison of scale-inhibiting properties of polyaspartic acid, polyacrylic acid and 2-phosphonobutane-1, 2, 4-tricarboxylic acid. |
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Abstract By means of Static Scale-inhibiting method, the scale-inhibiting properties of polyaspartic acid (PASP), polyacrylic acid (PAA) and 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) were determined. Simultaneously, scaling laws under these inhibitors were researched by rotation specimen method. Results showed that these inhibitors had threshold effect as the dosage of inhibitors increasing. The order of scale inhibition effects against CaCO3 of three inhibitors was as follows: PBTCA>PAA>PASP. When pH>7.0, pH had little impact on scale inhibition effects against CaSO4 of these inhibitors. As water-bath temperature increasing and residence time extending, scale inhibition effects against CaSO4 of these inhibitors increased at first, and then decreased. In wet Flue Gas Desulphurization System with Lime, all the scaling mass of hanging on-chip unit area increased at the beginning, and then decreased when the dosage of these scale inhibitors increased. With their dosage of 30mg/L, the scaling mass of hanging on-chip unit area of PASP, PAA and PBTCA was very small.
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Received: 17 March 2010
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