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首页> 外文期刊>Journal of Applied Polymer Science >Hydrolysis and thermal stability of partially hydrolyzed polyacrylamide in high-salinity environments
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Hydrolysis and thermal stability of partially hydrolyzed polyacrylamide in high-salinity environments

机译：高盐度环境中部分水解的聚丙烯酰胺的水解和热稳定性

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摘要

Partially hydrolyzed polyacrylamide (HPAM) is the water-soluble polymer most often used in flooding applications in the petroleum industry. However, in aqueous solutions at high temperatures, HPAM undergoes hydrolysis of the lateral amide groups, and the presence of salts in the solution can lead to precipitation of this polymer. Therefore, a method was developed to monitor the thermal stability of HPAM solutions in different saline environments and varying temperatures. The proposed test method involved measurements of intrinsic viscosity as a function of time and determination of the degree of hydrolysis of the HPAM by elemental analysis. The results obtained indicated that the presence of divalent cations (Ca+2 and Mg+2) negatively influenced the intrinsic viscosity of the solutions and in some systems led to precocious precipitation of the polymer in environments with higher concentrations of these cations. The hydrolysis reaction of the amide groups to the acrylate groups of the HPAM chain was significantly affected by rising temperature: at 50 degrees C, hydrolysis occurred, but not as significantly as at 70, 85, 90, and 95 degrees C. Hydrolysis up to 84% was observed for solutions processed at 90 degrees C. The results also indicated limits of hardness for the brine at some temperatures: 1353 ppm for 95 degrees C and 2867 ppm for 70 degrees C. For brine containing 13,610 ppm or more of divalent cations, hydrolysis and precipitation of the polymer were not observed at 50 degrees C. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47793.
机译：部分水解的聚丙烯酰胺（HPAM）是最常用于石油工业洪水应用中的水溶性聚合物。然而，在高温下的水溶液，HPAM进行水解横向酰胺基，及其盐的溶液中的存在可以导致该聚合物的沉淀。因此，开发了一种方法以监测不同盐水环境中HPAM溶液的热稳定性和不同的温度。所提出的试验方法涉及根据元素分析作为时间和测定HPAM的水解程度的函数的测量。获得的结果表明，二价阳离子（钙+ 2和Mg + 2）的存在下解的和导致在具有较高浓度的这些阳离子的环境中的聚合物的早熟沉淀一些系统特性粘度负面影响。通过上升温度的温度下显着影响酰胺基对HPAM链丙烯酸酯基团的水解反应：在50℃下，发生水解，但在70,85,90和95摄氏度下不显着。水解在90摄氏度下处理的溶液中观察到84％。结果还表明盐水在一些温度下的硬度限制：95℃的1353ppm和70℃的2867ppm，含有13,610ppm或更多的二价阳离子的盐水在50℃（c）2019 Wiley期刊，Inc.J.Papp中未观察到聚合物的水解和沉淀。聚合物。 SCI。 2019,136,4793。

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