共聚物PAMA在CaCO_3饱和溶液中的络合性能研究

Complexation Performance of Aspartic Acid/Malic Acid Copolymer in Supersaturated Calcium Carbonate Solution

聚合物的络合性能是决定其是否可用作阻垢剂的关键。为考察新型改性产品天冬氨酸-苹果酸共聚物(PAMA)的络合性能,以其与Ca^(2+)络合量为评价指标,参照静态阻垢法,研究了不同水质和工况条件下PAMA在碳酸钙过饱和溶液中的络合性能。结果表明,单一Ca^(2+)条件下,PAMA投加量为4 mg?L-1时,络合效果最佳,络合量最大,为1632.78mg?g-1;Fe^(3+)、Cu^(2+)及其混合离子的加入均削弱PAMA的络合性能,而Zn^(2+)则提升其性能;Ca^(2+)/Zn^(2+)、Ca^(2+)/Cu^(2+)、Ca^(2+)/Fe^(3+)、Ca^(2+)/Fe^(3+)/Zn^(2+)/Cu^(2+)条件下,PAMA投加量为20 mg?L-1时,其络合效果最佳,络合量最大,分别为1681.00、1460.04、1465.09、和1464.11 mg?g-1。由此可见,PAMA具有良好的络合性能,是碳酸钙的优秀阻垢剂。

Complexation performance is a key factor that determines the applicability of polymers as scale inhibitors. The complexation performance of a modified aspartic acid/malic acid copolymer(PAMA) with Ca^(2+) in supersaturated Ca CO3 solution was studied by a static scale inhibition method under different water quality and conditions. The results show that when only Ca^(2+) is presented in water, 4 mg?L-1 of PAMA exhibits the optimal complexation performance with a maximum capacity of 1632.78 mg?g-1. The capacity decreases with the addition of Fe^(3+), Cu^(2+) or Fe^(3+)/Cu^(2+) mixture, while Zn^(2+) can improve the complexation performance. In the presence of Ca^(2+)/Zn^(2+), Ca^(2+)/Cu^(2+), Ca^(2+)/Fe^(3+) and Ca^(2+)/Fe^(3+)/Zn^(2+)/Cu^(2+), the maximum complexation capacity are achieved with 20 mg?L-1 PAMA, which are 1681.00 mg?g-1, 1460.04 mg?g-1, 1465.09 mg?g-1 and 1464.11 mg?g-1, respectively. Therefore, PAMA exhibits good complexation performance and can be used as a scale inhibitor of calcium carbonate.