甲烷在烃类混合溶剂中高压溶解度的测定

Determination on the Solubility of Methane in Hydrocarbon Mixtures Under High Pressures

为了促进天然气汽车的发展和普及,选择环己烷-苯、正庚烷-环己烷和苯-正庚烷混合溶液作为溶剂,利用 自建的循环法测定气体高压溶解度实验装置,测定了甲烷在上述溶剂中的高压溶解度数据(288．15-318．15 K, 2．00-12．0MPa)．利用Peng-Robinson状态方程计算实验数据,发现对于非极性的混合溶剂,甲烷的逸度与其溶 解度成非常好的线性关系;考察了用文献中二元数据和用实验得出的三元数据计算交互作用参数对计算结果的影 响,结果表明,对于非极性体系,可以用二元的气液平衡(GLE)数据估算三元GLE数据,估算结果与实验值能很 好地吻合．

In order to find ideal solvents for natural gas vehicles （ NGVs）, data on the high-pressure solubility of methane in benzene-cyclehexane, n-heptane-benzene, n-heptane-cyclehexane at temperatures from 288.15 K to. 318.15 K and pressures from 2.00 MPa to 12.00 MPa were collected with a self-established apparatus that measured the solubility in a circular way. Calculation of fugacity coefficient of methane in gas phase with the Peng-Robinson cubic equation of state showed that the methane fugacity and the solubility satisfied the linear equation well. The equations represented the experimental data well over the complete temperature and pressure ranges, in which the ternary data of experiments correlated with the calculation from the binary data in literature. The study indicated that the ternary gas-liquid equilibrium （GLE） data can be estimated based on binary GLE data in literature.