天冬氨酸-衣康酸共聚物对碳酸钙阻垢性能研究

Calcium carbonate scale inhibition performance in the presence of poly(aspartic acid-itaconic acid)

为提高聚天冬氨酸(PASP)抑制碳酸钙结垢的性能,改性合成了新型产品天冬氨酸-衣康酸共聚物(PAI)。采用静态阻垢法,考察不同水质条件对PAI阻垢性能的影响,并与改性产品天冬氨酸-赖氨酸共聚物(PAL)和市售PASP进行了对比;初步从动力学角度,考察了PAI、有机膦系阻垢剂PBTCA和PASP在特定条件下阻垢效果的差异。结果表明,相同实验条件下,PAI的阻垢率最高可达90.12%,略优于PAL,明显高于PASP;碳酸钙结晶生长速率常数分别为k(PBTCA)=30.39<k(PAI)=34.806<k(PASP)=40.557。表明PAI是阻垢性能优异的新型改性产物,适用于水质条件不稳定和水力停留时间较长的用水系统。

In order to enhance the inhibition performance on CaCO3, polyaspartic acid （PASP） has been modified into a new product poly（aspartic acid itaconic acid） （PAl） . Static scale method was employed to study the effect of different water quality conditions on PAI scale-inhibiting performance, which was compared with another modified product aspartic acid - lysine copolymer （PAL） and commercial PASP. From the perspective of the crystallization kinetics, the difference on inhibition performance of PAI, organic phosphine inhibitor PBTCA and PASP was investigated difference under a certain condition. The results show that , under the same experi- mental condition, the inhibition rate of PAI can reach up to the peak of 90.12%, which is slightly better than PAL while significantly higher than the PASP. Crystal growth rate constants of calcium carbonate are k （PBT- CA） =30.39〈k （PAl）=34.806〈k （PASP）=40.557. The data above shows that PAl is a new modified product with excellent scale-inhibiting property, which is suitable for the water system with unstable water quality con- ditions and longer HRT.