水+甲烷系统的气液相边界曲线和临界线

摘要

The isothermal gas-liquid phase boundary lines and critical curve were determined for the water+methane system.Experiments were performed in a high-pressure volume-variable autoclave with a sapphire window and magnetic stirring.The temperature range was from 433.0 to 633.0 K and pressure from 30.00 to 300.00 MPa.Henry coefficients of dilute methane solutions were determined; the results show that these coefficients decrease with increasing temperature in the range from 433.0 to 603.0 K.The equilibrium gas-liquid ratios,partial molar solution enthalpy,and partial molar solution entropy were also calculated.The results show that the difference in the cohesive energy density between methnane and water is very large.%采用带有蓝宝石视窗和磁力搅拌的可变体积高压斧得出了水+甲烷系统的气液相边界曲线和临界曲线.实验温度为433,0-633.0K,实验压力为30.00-300.00 MPa.实验确定了甲烷在富水区的亨利系数,结果显示,在433.0-603.0K的温度范围内,此亨利系数随着温度的升高而下降.本文还研究了甲烷+水系统的气液分配比以及偏摩尔溶解焓和偏摩尔溶解熵数据,结果发现,甲烷和水的内聚能密度差别很大.