Abstract Amine foaming is a well-known incident in the natural gas sweetening unit. In this study, anionic surfactant sodium dodecylbenzenesulfonate (SDBS) and cationic surfactant hexadecyltrimethylammonium bromide (HTAB) were used as model foam creators in industrial lean methyldiethanolamine (MDEA) solution. The surfactant concentrations of 300, 500, 1000, and 3000 mg/L were prepared in lean MDEA solution and stirred to create foam. The final foam volume was found to increase with the increase in both the surfactant concentration and the stirring speed. However, SDBS showed higher foam volume (35 and 55 mL) than HTAB (20 and 25 mL) at low surfactant concentrations (300 and 500 mg/L). Ultrasonic waves were effective in defoaming all tested solutions. The rate of defoaming increased with temperature rise. At a fixed temperature and stirring, foam formation and defoaming obeyed the exponential function. The differences in physical properties, including density, dynamic viscosity, and surface tension before and after sonication, were insignificant. Interestingly, the content of organic acids, known as primary degraded products, remained almost constant. This work demonstrated the promising potential of ultrasonic waves for defoaming amine solutions in the natural gas industry.

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工业用甲基二乙醇胺溶液超声波消泡及其动力学研究

摘要 胺发泡是天然气脱硫装置中众所周知的事故。在本研究中，阴离子表面活性剂十二烷基苯磺酸钠 (SDBS) 和阳离子表面活性剂十六烷基三甲基溴化铵 (HTAB) 被用作工业贫甲基二乙醇胺 (MDEA) 溶液中的模型泡沫产生剂。在贫MDEA溶液中制备浓度为300、500、1000和3000mg/L的表面活性剂并搅拌以产生泡沫。发现最终泡沫体积随着表面活性剂浓度和搅拌速度的增加而增加。然而，在低表面活性剂浓度（300 和 500 毫克/升）下，SDBS 显示出比 HTAB（20 和 25 毫升）更高的泡沫体积（35 和 55 毫升）。超声波可有效消泡所有测试溶液。消泡率随温度升高而增加。在固定温度和搅拌下，泡沫形成和消泡服从指数函数。超声处理前后的物理性质（包括密度、动态粘度和表面张力）差异不显着。有趣的是，被称为初级降解产物的有机酸的含量几乎保持不变。这项工作证明了超声波在天然气工业中消泡胺溶液的潜力。