SDS与AEP的复配体系下天然气水合物生成分析

Analysis of Natural Gas Hydrate Formation in the Combined System of SDS and AEP

在天然气水合物储运技术的运用中,添加表面活性剂是一种被广泛应用的高效促进水合物形成的方法,其中表面活性剂的复配体系对天然气水合物生成的促进影响也是一个重要的研究方向。针对天然气水合物的大量快速制备,在初始压力7 MPa和2℃恒温条件下采用不同质量浓度的十二烷基硫酸钠(SDS)和脂肪醇聚氧乙烯醚磷酸酯(AEP)进行复配,观察不同质量浓度的复配体系对天然气水合物生成速率以及吸气量的影响。结果表明:在AEP溶液中,最终吸气量随着溶液质量浓度的增加而增加;但是由于壁垒效应的存在,阻碍了气体进一步溶解进入溶液中,延缓了水合物的生成,使得AEP溶液中水合物的生长速率与最终吸气量要低于SDS溶液;在SDS与AEP共同作用下,复配体系下水合物的生成速率与吸气量要大于单一体系下水合物的生成速率与吸气量。

In the application of natural gas hydrate storage and transportation technology,the addition of surfactants is a widely used method to efficiently promote the formation of hydrates.Among them,the influence of the surfactant compound system on the promotion of natural gas hydrate formation is also an important factor.Aiming at the rapid preparation of a large number of natural gas hydrates,different concentrations of sodium dodecyl sulfate(SDS)and fatty alcohol polyoxyethylene ether phosphate(AEP)were used to compound under the initial pressure of 7 MPa and 2℃constant temperature conditions.The effect of different concentrations of the compound system on the formation rate of natural gas hydrate and gas inhalation was investigated.The results showed that,in the AEP solution,the final gas inhalation increased with the increase of the mass concentration of the solution;however,due to the existence of the barrier effect,the gas was prevented from further dissolving into the solution,delaying the formation of hydrates,and making the hydrate growth rate in the AEP solution and final inhalation of SDS were lower than that of SDS solution;under the combined action of SDS and AEP,the formation rate and inhalation of hydrate in the compound system were greater than the rate of formation and inhalation of hydrate in a single system.