纳米石墨颗粒与SDS复配对CO_2水合物生成诱导时间的影响

Effect of Graphite Nanoparticles and SDS on Induction Time of Gas Hydrate Formation

为得到有效降低气体水合物生成诱导时间的工艺方法,在277.15 K、不同压力（2.5~6.5 MPa）条件下,利用釜式水合物实验装置,开展了0.5%纳米石墨颗粒与表面活性剂SDS复配对水合物生成诱导时间影响的实验研究。结果表明,随压力的升高,水合物生成的诱导时间呈现降低趋势,平均降幅达5.8 min/MPa。277.15 K、4.5 MPa时,纳米石墨颗粒与SDS的引入使得体系较纯水体系中水合物生成的诱导期均呈不同程度的缩短趋势,降幅达20%左右。而二者复配体系的诱导时间较纯水体系显著缩短,如0.5%纳米石墨与0.03%SDS复配体系与相同条件下的纯水体系相比降幅高达61.8%。纳米石墨颗粒与SDS的复配有效加快了水合物成核速率,显著缩短了水合物生成的诱导时间;且其在对水合物生成的诱导时间上的作用效果较对应浓度的单一添加剂体系更好,二者复配型水合物生成促进剂的开发是今后重点研究的方向。

In order to get the process of reducing the induced time of gas hydrate technological effectively,the mixture of 0. 5% graphite nanoparticles and SDS were injected into the hydrate formation reactor and the effect on the hydrate formation induction time were studied while pressure and temperature were maintained at 4. 5 MPa and277. 15 K. The results show that the induction time of gas hydrate formation decreased with increasing pressure,the average drop of 5. 8 min / MPa. The induction time of graphite nanoparticles solution or the SDS solution was a little shorter than that of pure water under 4. 5 MPa and 277. 15 K. Then the induction time was was mostly decreased by61. 8% in the 0. 5% graphite nanoparticles and 0. 03% SDS solution compared with pure water. Thus the introduction of graphite nanoparticles and SDS had a positive effect on hydrate nucleation rate and shortened the induction time significantly. It was better than single additive and the development of the complex matches of hydrate formation promoter is a key research direction in the future.