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水合物添加剂在一定程度上能够解决纯水体系下水合物分离混合气存在选择性低、水合速率不高和水合物生成条件苛刻等问题,为了系统地研究十二烷基硫酸钠(SDS)及四氢呋喃(THF)对水合物分离特性的影响,采用自行设计的水合物分离实验装置,分别进行了浓度为0、100 mg/kg3、00 mg/kg5、00 mg/kg1、000 mg/kg的SDS溶液及摩尔分数为0、0.5%、1.0%、3.0%的THF溶液体系下,水合物法分离摩尔分数为59%的CO2和摩尔分数为41%的N2混合气的实验。实验结果表明:SDS能够提高水合物的生成速率及储气密度,随着SDS浓度的增大,CO2分离率与N2损失率都呈现先增大后减小的趋势,分离因子呈现先减小后增大的趋势,在初始压力为5.0 MPa、温度为1.4℃的情况下,SDS浓度为0~100 mg/kg时水合物分离效果较佳;THF有效地降低了水合物的相平衡压力,THF本身生成Ⅱ型水合物并占据水合物的大孔穴,CO2优先于N2占据水合物的小孔穴,当初始压力为4.8 MPa、温度为1.4℃时,THF摩尔分数约为1.0%时能够较好地改善水合物的分离效果。
To a certain extent, the hydrate additives can solve the problems of low selectivity, low hydration rate and severe hydrate generation conditions under the pure water system. In order to systematically study the effects of sodium dodecyl sulfate (SDS) and Tetrahydrofuran (THF) was used to separate the hydrate. The self-designed hydrate separation experiment equipment was used and the concentration of SDS was 0,100 mg / kg, 3,00 mg / kg, 5,00 mg / kg and 1,000 mg / kg respectively Under the THF solution system with molar ratio of 0,0.5%, 1.0% and 3.0%, the mixture of 59% mole fraction of CO2 and 41% mole fraction of N2 was separated by hydrate method. The experimental results show that SDS can increase the formation rate of hydrate and the density of gas storage. With the increase of SDS concentration, both the CO2 separation rate and the N2 loss rate first increase and then decrease, and the separation factor first decreases . When the initial pressure is 5.0 MPa and the temperature is 1.4 ℃, the hydrate separation effect is better when the concentration of SDS is 0-100 mg / kg; THF can effectively reduce the phase equilibrium pressure of hydrate, and the THF Hydrate itself is formed and occupies the large hydrate hole, CO2 preferentially occupies small hydrate hole in N2. When the initial pressure is 4.8 MPa and the temperature is 1.4 ℃, the mole fraction of THF is about 1.0% Improve hydrate separation.