Development of poly (aspartic acid-co-malic acid) composites for calcium carbonate and sulphate scale inhibition
Kumar, N. Mithil
Gupta, Sanjay Kumar
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Polyaspartic acid (PSI) is suitable for the inhibition of inorganic scale deposition. To enhance its scale inhibition eﬃciency, PSI was modiﬁed by reacting aspartic acid with malic acid (MA) using thermal polycondensation polymerization. This reaction resulted in poly(aspartic acid-co-malic acid) (PSI-co-MA) dual polymer. The structural, chemical and thermal prop-erties of the dual polymers were analysed by using scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diﬀraction, diﬀerential scanning calorimetry and gel permeation chromatography. The eﬀectiveness of six diﬀerent molar ratios of PSI-co-MA dual polymer for calcium carbonate and calcium sulphate scale inhibition at laboratory scale batch experiments was evaluated with synthetic brine solution at selected doses of polymer at 65–70°C by the static scale test method. The performance of PSI-co-MA dual polymer for the inhibition of calcium carbonate and calcium sulphate precipitation was compared with that of a PSI single polymer. The PSI-co-MA exhibited excellent ability to control inor-ganic minerals, with approximately 85.36% calcium carbonate inhibition and 100% calcium sulphate inhibition at a level of 10 mg/L PSI-co-MA, respectively. Therefore, it may be reasonably concluded that PSI-co-MA is a highly eﬀective scale inhibitor for cooling water treatment applications.
Kumar, N. M. 2014. Development of poly (aspartic acid-co-malic acid) composites for calcium carbonate and sulphate scale inhibition. Environmental Technology : DOI: 10.1080/09593330.2014.984773.