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首页> 外文期刊>Desalination: The International Journal on the Science and Technology of Desalting and Water Purification >Molecular weight effect on PAA antiscale performance in LT-MED desalination system: Static experiment and MD simulation
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Molecular weight effect on PAA antiscale performance in LT-MED desalination system: Static experiment and MD simulation

机译：LT-MED海水淡化系统中PAA防震性能的分子量效应：静态实验和MD仿真

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Static experiment simulated LT-MED seawater desalination condition was performed to measure antiscale efficiency of polyacrylic acid with a series of molecular weight. Scale inhibition ratio rose along with PAA dosage increased from 0.25 to 5 mg/L. When PAA dosage exceeded 2.25 mg/L, scale inhibition ratios above 95% were obtained. Interestingly, under the same dosage 1.5 mg/L, the scale inhibition ratio was relatively low for PAA samples with larger M-n. All inhibition ratio curves exhibit a turning point when PAA dosage increases: for PAA with lower molecular weight, the turning point comes earlier. Data of inhibition efficiency shows correlation with PAA molarity rather than mass concentration, in other words, number of molecules behave more significance in scale inhibition process than chain length or number of functional groups. Antiscale mechanism was then established through data analysis above, and how molecular weight of PAA influences its lattice distortion ability on CaCO3 scale in LT-MED desalination system was explicitly elucidated. MD simulation was then carried out to demonstrate the proposed theory, by virtue of a new model concerning radius of critical nucleus.
机译：静态实验模拟LT-MED海水淡化条件是为了测量聚丙烯酸与一系列分子量的反念效率。比例抑制率随着PAA剂量增加0.25至5mg / L.当PAA剂量超过2.25mg / L时，获得95％以上的比例抑制比。有趣的是，在相同的剂量下＆ 1.5 mg / L，对于具有较大M-N的PAA样品，抑制率相对较低。当PAA剂量增加时，所有抑制比曲线表现出转折点：对于分子量较低的PAA，转折点提前。抑制效率的数据显示与Paa摩尔性而不是质量浓度的相关性，换句话说，分子数在比例抑制过程中的比例比链长度或官能团的数量在于。然后通过上述数据分析建立反震机制，并且PAA的分子量是明确阐明LT-MED海水淡化系统中CACO3刻度上的晶格变形能力的方式。然后进行MD模拟以借助于临界核的半径的新模型来展示所提出的理论。

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