Water from most natural sources usually contains dissolved minerals and scale forming ions such as Ca2+ and Mg2+ ions. Poly (acrylic acid) (PAA) is one of the scale inhibitor polymers, commonly used in the industrial circulating cooling water system. However, the remaining polymer concentrations of scale inhibitors are facing some level of difficulty for determination. This is mainly due to the fact that there is a similar range of UV adsorption to another organic compound in the cooling water system. For that, the modification of PAA to copolymer of acrylic acid and sodium styrene sulfonate (NaSS) are being thoroughly investigated. Poly (acrylic acid-co-sodium styrene sulfonate)s are synthesized by a free radical polymerization procedure under the water solution technique being performed, together with potassium persulfate as a free radical initiator. The synthesized copolymers are confirmed by 1H-NMR, FTIR and UV-Vis Spectroscopy. As such, the molecular weights of PAA-co-NaSSs are characterized by 1H-NMR and thermal analysis data are also being conducted by a TGA. Concentration of polymer dosages at 10, 20, 30, 40, 50, 60, 80 and 100 ppm are consecutively tested in supersaturated calcium ion (400 ppm) and bicarbonate ion (500 ppm) solutions at a temperature of 70¬∞C for a time period of 24 hours. Most importantly, the performance of PAA-co-NaSS on complexes with Ca2+ and ratio of scale inhibitor are also being studied.
Nut Jianwirak, King Mongkut's University of Technology North Bangkok, Thailand
Siriporn Pranee, Kasetsart University, Thailand
Samitthichai Seeyangnok, King Mongkut's University of Technology North Bangkok, Thailand
Stream: Environmental Sustainability & Environmental Management: Freshwater, Oceans and Seas
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