丁二酸二异辛酯磺酸钠对甲烷水合物生长动力学特性的影响

通过改变添加量（600mg/L、900mg/L、1200mg/L）、过冷度（3.5℃、5.5℃、7.5℃）以及压力（4.90MPa、6.0MPa、7.31MPa）的方式，考察了在静态体系下绿色促进剂丁二酸二异辛酯磺酸钠（AOT）对甲烷水合物生长动力学特性的影响。实验结果表明，3种浓度下AOT均能够有效缩短诱导时间，并且浓度越大，诱导时间越小（1200mg/L时为0.21h），但储气量随着添加量的增加，先增大后减小，最终确定最佳添加量为900mg/L，水合物储气量为55.76m³/m³；另外，过冷度越大，实验压力越高，水合物成核速度越快，诱导时间越短，耗气速率越高。当过冷度为7.5℃时，诱导时间最小为0.31h，耗气速率最大为0.275mol/h，储气量最大为63.95m³/m³；但压力过大，釜内气液界面会快速生成水合物层，阻碍水合物继续生成，导致水合物储气量减少为46.84m³/m³。所以，在静态体系下，合理选择促进剂的浓度和驱动力的大小，可显著促进水合物生成。

Effect of docusate sodium on growth kinetics of methane hydrate

In this experiment, the green promotion in the static system was investigated by changing the amount of addition (600mg/L, 900mg/L, 1200mg/L), subcooling (3.5℃, 5.5℃, 7.5℃) and pressure (4.90MPa, 6.0MPa, 7.31MPa). The experimental results show that AOT can effectively shorten the induction time under the three concentrations, and the higher the concentration, the smaller the induction time (0.21h at 1200mg/L), but the gas storage increases first and then decreases with the increase of the added amount. Finally, the optimum addition amount is 900mg/L, and the hydrate storage capacity is 55.76m³/m³. In addition, the higher the degree of subcooling and the higher the experimental pressure, the faster the hydrate nucleation rate, the shorter the induction time, and the higher the gas consumption rate. When the degree of subcooling is 7.5℃, the induction time is 0.31h, the gas consumption rate is 0.275mol/h, and the maximum gas storage is 63.95m³/m³. However, if the pressure is too high, hydrate will rapidly be formed at the gas-liquid interface in the kettle. The layer hinders the hydrates from continuing to form, resulting in a reduction of hydrate storage capacity to 46.84 m³/m³. Therefore, under the static system, reasonable selection of the concentration of the promoter and the driving force can significantly promote the formation of hydrate.