羟丙基瓜尔胶超声降解参数优化及降解机理分析

Parameters Optimization and Mechanism Analysis of Ultrasonic Degradation of Hydroxypropyl Guar Gum

王富华 孙泽壮 廖 丽 时 贤 陈 君 冯大强 赵 玉 姜 琪

WANG Fuhua SUN Zezhuang LIAO Li SHI Xian CHEN Jun FENG Daqiang ZHAO Yu JIANG Qi

针对压裂返排液有机污染物降解难度大、处理工艺复杂等问题，采用单因素分析和正交实验研究了压裂返 排液关键污染物羟丙基瓜尔胶的超声降解规律，并探讨了其降解机理。结果表明：羟丙基瓜尔胶超声降解机理 主要以物理剪切断链为主，超声模式和超声功率为羟丙基瓜尔胶降解反应的主控参数，其次是浓度，超声时间、 温度、pH值等因素影响较小。对于一定质量浓度（600 mg/L）的羟丙基瓜尔胶溶液，最优降解参数为：占空比为 40%、超声功率为360 W、超声时间为60 min、温度为25 ℃。鉴于温度和pH值影响较小，超声降解技术可以应用 于较宽的温度范围（5～50 ℃）和酸碱度范围（pH 5～11）。

It is difficult to solve the problem of the degradation of organic pollutants in fracturing flow-back fluid and the treatment process is complex. In this paper，the law and mechanism of ultrasonic degradation of hydroxypropyl guar gum，which is a key contaminant in fracturing flow-back fluid，was analyzed. The results suggested that the mechanism of ultrasonic degradation of hydroxypropyl guar gum was mainly physical shearing，ultrasonic mode and power were the main controlling parameters of hydroxypropyl guar gum degradation reaction，followed by concentration. The ultrasonic time，temperature，pH value and other factors had little influence on hydroxypropyl guar gum degradation reaction. For a certain concentration of hydroxypropyl guar gum solution，the optimal degradation parameters were as follows，the duty ratio was 40%，the ultrasonic power was 360 W，the ultrasonic time was 60 min and the temperature was 25 ℃. Because temperature and pH had little influence on hydroxypropyl guar gum degradation reaction，the ultrasonic degradation technology could be applied to a wide temperature range of 5—50 ℃ and pH range of 5—11.

10.19346/j.cnki.1000-4092.2023.01.021