表面活性剂对瓦斯水合物生成诱导时间影响

Effect of surfactant on induction time of gas hydrate formation

为了揭示表面活性剂在瓦斯水合物生成过程的促进作用规律,利用可视化水合物实验设备,研究了5组表面活性剂溶液体系(T40,1.0×10-3 mol·L-1;T80,1.0×10-3 mol·L-1;T40/T80,1.0×10-3 mol·L-1;SDS,10.0×10-3 mol·L-1;SDBS,2.0×10-3 mol·L-1)中瓦斯水合物的生成过程,运用直接观测法测定了水合物生长的广义诱导时间,结合建立的水合物诱导时间模型对实验数据进行了计算和分析。结果表明:表面活性剂的加入降低了溶液的表面张力,促进了烷烃类气体溶解,加快了晶核形成过程,缩短了水合物生成的诱导时间。该成果对运用水合物技术储运瓦斯具有一定理论价值。

To find out the acceleration effect of surfactant on the process of gas hydrate formation, gas hydrate formation processes in five groups of surfactant solution systems （T40, 1.0×10^-3 mol·L^-1; T80, 1.0×10^-3 mol·L^-1; T40FF80, 1.0×10^-3 mol·L^-1; SDS, 10.0×10.0-3 mol·L^-1; SDBS, 2.0×10^-3 mol·L^-1 ） were investigated using the visual hydrate equipment, and the generalized induction time was measured by means of the direct observation method. The experimental data were calculated and analyzed combined with the calculation model of induction time. The results show that the addition of surfactant decreases the surface tension of the solution, which facilitates the gas dissolution, quickens the crystal nucleus formation, and shortens the induction time. The results are of important theoretical value to the mine gas storage and transport based on gas hydrate technique.