十二烷基硫酸钠(SDS)对甲烷水合物膜生长动力学的影响

Influence of Sodium Dodecyl Sulfate(SDS) on Film Growth Kinetics of Methane Hydrate

采用水中悬浮单个气泡法测定了不同温度(273.4～279.4K)和压力(3.60～11.90MPa)下甲烷在含SDS水溶液中的水合物膜生长动力学数据,并应用Chen-Guo模型中的无因次Gibbs自由能差作为推动力(-△G/(RT))对实验数据进行关联,得到了一个较为简单的数学模型。由实验数据回归出不同SDS浓度下的甲烷水合物膜生长动力学的反应级数,并根据模型回归的参数和Arrhenius方程计算出甲烷水合物膜生长表观活化能及指前因子,同时也讨论了SDS对甲烷水合物膜生长速率的影响。

Film growth kinetic data of methane hydrate in aqueous solution with different sodium dodecyl sulfate（SDS） concentrations were measured over the temperature and pressure ranges of 273.4～279.4 K and 3.60～11.90 MPa,respectively by single suspended bubble method.The dimensionless Gibbs free energy difference of Chen-Guo model（-ΔG/（RT）） was used as the driving force to correlate the experimental data,and a simple hydrate film growth kinetic model was proposed.The reaction orders of methane hydrate film growth in aqueous solution with different SDS concentrations were regressed by the experimental data.Moreover,the apparent activation energies and pre-exponential factors of methane hydrate film growth kinetic were calculated by the regressed parameters of the kinetic model proposed and the equation of Arrihenius.In the mean time,the influence of SDS upon the film growth rate of methane hydrate was also discussed.