低磷阻垢剂在低温多效海水淡化过程中的应用

Application of Low Phosphorus Scale Inhibitor in Thermal Desalination

摘要:

以羟基乙叉二膦酸(HEDP)、端羧基超支化聚酯（CHBP）、水解聚马来酸酐(HPMA)、聚丙烯酸(PAA)为原料，研制出一种具有环保功能的低磷复配高效阻垢剂，利用傅里叶红外光谱（FTIR）对CHBP的分子结构进行了表征，通过静态阻垢实验和模拟低温多效蒸馏海水淡化体系下的铜管垢样生长实验考察了低磷阻垢剂的阻垢性能。采用扫描电镜（SEM）和X射线衍射（XRD）分析了垢样的形貌和晶体结构。结果表明，该低磷阻垢剂的最佳配方质量比为m(HEDP): m(CHBP): m(HPMA): m( PAA) = 1:9:80:10，在其投加量为15 mg /L时，碳酸钙阻垢率为87.5%。阻垢剂中的羧基是阻止碳酸钙垢形成的主要因素。CHBP的引入降低了配方中的总磷含量。在加入该阻垢剂后，铜管上垢样的形貌发生了改变，易在水相中悬浮而随水流走，从而难以沉积生长在换热器的表面

Abstract:

Low phosphorus scale inhibitor was synthesized with hydrolyses polymaleic anhydride (HPMA), 1-hydroxy ethylidene-1, 1-diphosphonic acid (HEDP) and polyacrylic acid (PAA), and carboxyl-terminated hyperbranched polyester (CHBP) as the main components, and then, its scale inhibiting performance was evaluated by calcium carbonate deposition method and deposition test of copper tube. The molecular structure of CHBP was proved by FTIR. The morphology and crystal structure of scale samples was proved by SEM and XRD. The results shows that the optimum composition of low phosphorus scale inhibitor is the above 4 components with mass ratios of m(HEDP): m(CHBP): m(HPMA): m( PAA) = 1:9:80:10. The scale-inhibiting rate of the composed reagent reached 87.5% when the dosage was 15 mg/L. The carboxyl groups of scale inhibitor prevent the formation of calcium carbonate scale. The introduction of CHBP can obviously reduce the content of total phosphorus, and the changed morphology of scale sample could stable in the water and flow easily, resulting in scale could not grow and aggregate in the surface of the heat exchanger.