Synthesis of Phosphono Scale Inhibitor( PMAAAP) and Its Scale Inhibition Mechanism
Author(s): ZHANG Wen-yi, CHEN Ping, LI Wen-yu, DENG Wen, YAO Li-rong, CHENG Han-fei, School of Environmental & Safety Engineering, Changzhou University, Huatian Engineering and Technology Corporation
Pages: 778-783
Year: 2015 Issue: 7
Journal: Fine Chemicals
Keyword: scale inhibitor; cooling water; NMR; SEM; water treatment technology and environmental protection;
Abstract: Phosphono scale inhibitor was synthesized through polymerization reaction using maleic anhydride,acrylic acid and sodium hypophosphite as raw materials. The scale inhibition performance of phosphono maleic anhydride acrylic acid polymer( PMAAAP) under different conditions was investigated. The crystal structure of the calcium precipitation was analyzed by XRD,the morphology features of the calcium precipitation was described by SEM,and the calcium carbonate crystallization process was revealed by conductivity-t dynamic curve. The results show that the maximum calcium carbonate scale inhibition rate is 100% and the maximum calcium phosphate scale inhibition rate is60. 87% under the conditions of dosage of 25 mg / L,p H of 8 and water temperature ranging from 30 ℃to 45 ℃. XRD revealed that the calcite structure in calcium carbonate crystal decreased and the unstable vaterite structure appeared. SEM revealed that the morphology of the calcium carbonate after the addition of PMAAAP is characterized by amorphosity. Determination of the solution conductivity showed that PMAAAP obviously inhibited the formation of calcium carbonate deposits.
Pages: 778-783
Year: 2015 Issue: 7
Journal: Fine Chemicals
Keyword: scale inhibitor; cooling water; NMR; SEM; water treatment technology and environmental protection;
Abstract: Phosphono scale inhibitor was synthesized through polymerization reaction using maleic anhydride,acrylic acid and sodium hypophosphite as raw materials. The scale inhibition performance of phosphono maleic anhydride acrylic acid polymer( PMAAAP) under different conditions was investigated. The crystal structure of the calcium precipitation was analyzed by XRD,the morphology features of the calcium precipitation was described by SEM,and the calcium carbonate crystallization process was revealed by conductivity-t dynamic curve. The results show that the maximum calcium carbonate scale inhibition rate is 100% and the maximum calcium phosphate scale inhibition rate is60. 87% under the conditions of dosage of 25 mg / L,p H of 8 and water temperature ranging from 30 ℃to 45 ℃. XRD revealed that the calcite structure in calcium carbonate crystal decreased and the unstable vaterite structure appeared. SEM revealed that the morphology of the calcium carbonate after the addition of PMAAAP is characterized by amorphosity. Determination of the solution conductivity showed that PMAAAP obviously inhibited the formation of calcium carbonate deposits.
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