Zhu Shijie, Ye Zhongbin, Liu Zhezhi, Chen Zhonghua, Li Jun, Xiang Zuping
Institute of Petroleum and Natural Gas Engineering, Chongqing University of Science and Technology, Chongqing 401331, China.
Chengdu Technological University, Chengdu 610031, China.
Polymers (Basel). 2021 May 28;13(11):1774. doi: 10.3390/polym13111774.
In practical applications, the chemical and physical adsorption of a polymer solution greatly affects its action mode and effect. Understanding the adsorption mechanism and its influencing factors can help to optimize the application mode and ensure application efficiency. Three types of polymer solutions-partially hydrolyzed polyacrylamide (HPAM), hydrophobically associating polymer (AP-P4), and dendrimer hydrophobically associating polymer (DHAP), which are viscoelastic liquids-were used as sorbates to study their adsorption by a sorbent such as quartz sand. The effects of the solution concentration, contact time, particle size of quartz sand, solid-liquid ratio, and fluid movement on the adsorption capacity of the polymer solutions were examined. The results showed that HPAM presents a typical Langmuir monolayer adsorption characteristic, and its adsorption capacity (per unit area) is 1.17-1.62 μg/cm. The association enhances the interactions of the AP-P4 and DHAP solutions, and they present multilayer characteristics of first-order chemical adsorption and secondary physical molecule adsorption. Moreover, the dendrite structure further increases the adsorption thickness of DHAP. Hence, the adsorption thicknesses of AP-P4 and DHAP are four and six times that of HPAM, respectively. The adsorption of the three polymers is consistent with the influence of fluid motion and decreases with increasing fluid velocity. However, the larger the thickness of the adsorption layer, the clearer the influence of the flow, and the higher the decrease in adsorption capacity. Optimizing the injection rate is an effective method to control the applications of a polymer in porous media.
在实际应用中，聚合物溶液的化学和物理吸附极大地影响其作用方式和效果。了解吸附机理及其影响因素有助于优化应用方式并确保应用效率。使用三种聚合物溶液——部分水解聚丙烯酰胺（HPAM）、疏水缔合聚合物（AP-P4）和树枝状疏水缔合聚合物（DHAP），它们均为粘弹性液体，作为被吸附物来研究其在石英砂等吸附剂上的吸附情况。考察了溶液浓度、接触时间、石英砂粒径、固液比以及流体运动对聚合物溶液吸附容量的影响。结果表明，HPAM呈现典型的朗缪尔单层吸附特征，其吸附容量（单位面积）为1.17 - 1.62 μg/cm。缔合作用增强了AP-P4和DHAP溶液的相互作用，它们呈现一级化学吸附和二级物理分子吸附的多层特征。此外，树枝状结构进一步增加了DHAP的吸附厚度。因此，AP-P4和DHAP的吸附厚度分别是HPAM的四倍和六倍。三种聚合物的吸附情况与流体运动的影响一致，且随流体流速增加而降低。然而，吸附层厚度越大，流动的影响越明显，吸附容量的降低幅度越高。优化注入速率是控制聚合物在多孔介质中应用情况的有效方法。
