Ma Chao, Chen Yan, Ren Wen Dong, Liu Xing Yu, Gu Wen, Zhou Hui Li
School of Petroleum Engineering, Yangtze University, Wuhan 434100, China.
Key Laboratory of Oil and Gas Drilling and Production Engineering, Wuhan 434100, China.
ACS Omega. 2022 Apr 7;7(15):13075-13082. doi: 10.1021/acsomega.2c00452. eCollection 2022 Apr 19.
The conventional ferrocyanide complex ([Fe(CN)]) has been widely used as a scale inhibitor under mild conditions, but its oxidation at high temperature compromises the subsequent wastewater treatment processes. To conquer the inadequacies of Fe(CN)], aminotriacetamide (NTA) was synthesized using chloroacetic acid as an initial material and its molecular structure was characterized using FT-IR spectroscopy, H-NMR, and TGA. NTA was exploited in combination with polyaspartic acid (PASP) and sodium dodecyl benzene sulfonate (SDBS) to prepare a high-performance antisalt composite, and the scaling inhibitor performance was evaluated. The results revealed that as the concentration of the antisalt composite increased from 0.5 to 1.2 wt %, the solubility and inhibition rate increased by 95.6 and 12.33%, respectively, at 100 °C. The results from molecular simulation evidenced that the order of binding energy between a unit mass of the salt inhibitor and sodium chloride crystal increased in the following order; SDBS > NTA > PASP. The deformation strength between the salt inhibitor and sodium chloride crystal increased as follows: NTA > PASP > SDBS. In addition, the antisalt composite mainly hampered salt precipitation through strong adsorptions arising from both the nitrogen atom of NTA and oxygen atom of SDBS with the sodium atom of sodium chloride crystals, and as a result, it not only altered the crystalline form of sodium chloride but also reduced the adsorption of sodium atoms and eventually improved the salt solubility.
传统的亚铁氰化物络合物（[Fe(CN)]）在温和条件下已被广泛用作阻垢剂，但它在高温下的氧化会影响后续的废水处理过程。为克服[Fe(CN)]的不足，以氯乙酸为原料合成了氨基三乙酸（NTA），并通过傅里叶变换红外光谱、氢核磁共振和热重分析对其分子结构进行了表征。将NTA与聚天冬氨酸（PASP）和十二烷基苯磺酸钠（SDBS）联合使用制备了一种高性能抗盐复合材料，并对其阻垢性能进行了评估。结果表明，在100℃下，随着抗盐复合材料浓度从0.5 wt%增加到1.2 wt%，溶解度和抑制率分别提高了95.6%和12.33%。分子模拟结果表明，单位质量的阻盐剂与氯化钠晶体之间的结合能顺序为：SDBS > NTA > PASP。阻盐剂与氯化钠晶体之间的变形强度顺序为：NTA > PASP > SDBS。此外，抗盐复合材料主要通过NTA的氮原子和SDBS的氧原子与氯化钠晶体的钠原子产生的强吸附作用来阻碍盐的沉淀，结果，它不仅改变了氯化钠的晶型，还减少了钠原子的吸附，最终提高了盐的溶解度。
