羧酸聚合物对硫酸盐垢的抑制作用和机理

 采用静态阻垢法评定了膦酰基羧酸调聚物（POCA）、聚丙烯酸(PAA)、丙烯酸(AA)-丙烯酸羟丙酯(HPA)共聚物(T-225)、水解聚马来酸酐(HPMA)、AA与2-丙烯酰胺-2-甲基丙磺酸(AMPS)的共聚物（AA-AMPS）5种羧酸类聚合物阻垢剂对CaSO₄和BaSO₄垢的阻垢性能。采用分子动力学(MD)方法，模拟计算了5种聚合物与CaSO₄晶体的最主要生长面(020)晶面的相互作用结合能、非键作用能等参数。结果表明，随着聚合物阻垢剂用量的增加，其阻垢性能增强；在用量为15mg/L时，POCA、PAA、T-225、HPMA和AA-AMPS对CaSO₄垢的阻垢率分别为100%、80.4%、92.3%、90.1%和95.5%；对BaSO₄垢的阻垢率分别为90.7%、60.9%、82.6%、70.6%和88.6%。五种聚合物按它们与(020)晶面结合能和非键作用能大小的排序为POCA>AA-AMPS >T-225 >HPMA >PAA，这一顺序也代表了它们对CaSO₄垢的阻垢能力大小的排序。理论计算与实验室静态阻垢评定结论一致。

SCALE INHIBITING EFFECT AND MECHANISM OF CARBOXYLIC POLYMERS ON SULFATE SEDIMENTS

The antiscaling performance of phosphono carboxylic acid telomer (POCA)、 polyacrylic acid (PAA) 、acrylic acid- acrylic acid hydroxypropyl acrylate copolymers (T-225)、hydrolyzed polymaleic anhydride(HPMA) and acrylic acid- 2-acrylamido-2-methylpropanesulfonic copolymer (AA-AMPS copolymer)on CaSO4 and BaSO4sediments of oilfield injection water was studied, the results show the more the concentration of scale inhibitors, the stronger the efficiency of scale inhibition; the efficiency of five polymers is 100%，80.4%，92.3%, 90.1%, 95.5%respectively on CaSO4 and 90.7%，60.9%，82.6% ,70.6%， 88.6% on BaSO4 when the concentration of polymers is 15mg/L. The interactions such as binding energies and non-bind energies between five kinds of carboxylic polymer scale inhibitors and the most principal (020) crystal surface of Gypsum had been simulated by molecular dynamics (MD). The orders of binding energies and non-binding energies of five polymers with (020) crystal surface are as follows: POCA>AA-AMPS>T-225 >HPMA >PAA, the bigger the binding energies and non-binding energies, the stronger the binding effect between polymers and crystal surface, this means the scale inhibiting effect on Gypsum crystal is POCA>AA-AMPS>T-225>HPMA>PAA which is correspond with the experiment results. The non-binding effects are mainly provided by coulomb. On the basis of this theory, the copolymer of itaconate- acrylic acid hydroxypropyl acrylate-2-acrylamido-2-methylpropanesulfonic-phosphorous acid (IA-HPA-AMPS- H3PO3)was synthesized , the scale inhibiting ability on sulfate sediments is stronger than POCA and AA-AMPS copolymer.