水合物法分离甲烷-乙烷体系相关相平衡的研究  

Study on the Phase Equilibrium Related to the Separation of Methane-Ethane Through Forming Hydrates

作　　者：丁艳明 陈光进 孙长宇 张凌伟 王秀林 

机构地区：[1]中国石油大学高压流体相态与物性研究室,北京102249

出　　处：《石油学报（石油加工）》2005年第6期75-79,共5页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金(90210020);高等学校全国优秀博士学位论文作者专项资金(200447)资助项目

摘　　要：开发了一种水合物法分离甲烷-乙烷混合气体的新技术,考察了在阴离子表面活性剂十二烷基硫酸钠(SDS,C12H25OSO3Na)存在下,甲烷-乙烷体系的气-水合物相平衡。在一定范围内改变体系的初始压力、温度和气/液体积比,得到了乙烷在气-水合物两相的摩尔分率和分配系数,以及体系达到平衡时的压力。结果表明,在初始压力为4.0 MPa、温度为274.15 K、气/液体积比为185.1的条件下,甲、乙烷分离效果达到最佳。还考察了甲烷-乙烷体系水合物生成速率与SDS质量浓度的关系。实验发现SDS的质量浓度为300 mg/l时,水合物能快速生成。在SDS存在下,采用水合物分离技术,能成功地使甲烷、乙烷气体分离。A new methane-ethane separation technology through forming hydrates was developed, and the vapor-hydrate equilibria in methane-ethane system with the presence of surfactant SDS （C12H25OSO3Na） were studied. The tool fractions of ethane in vapor and hydrate phases, the equilibrium pressure of system, and the partition coefficients of ethane between vapor and hydrate phases were gained at different initial pressures, temperatures and gas-liquid volume ratios. The results demonstrated that high separation capacity could be attained when the initial pressure was 4.0 MPa, temperature was 274.15 K and the gas-liquid volume ratio was 185.1. The influence of SDS mass concentration on the hydrate formation rate was also investigated. The experimental data showed that hydrate could form very rapidly when the mass concentration of SDS was 300mg/l. The methane-ethane could then be successfully separated through forming hydrates with the presence of SDS.

关 键 词：水合物 分配系数 乙烷 表面活性剂 相平衡 

分 类 号：TQ028[化学工程]