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建立了一套测定高压下气体在液体中溶解度的装置,该装置具有以下特点：气液相可充分混合,平衡釜通过底部活塞加压,最高测定压力可达40．0 MPa,液相在体系循环状态下取样可避免物系的二次平衡,体系死体积较小,装置恒温槽的控温精度较高(±0．1℃)．利用此装置测定了温度为298．15 K、303．15 K和压力2．0～12．0 MPa下甲烷在正己烷中的溶解度数据并与文献值相比较,从实验数据的精度和重复性考察了实验装置的可靠性,实验值和文献值的相对误差均小于2．5%,同时根据Kricheveky-Kasarnovsky(K-K)方程提出了一种从高压实验数据回归常压实验数据的方法．
A set of device for measuring the solubility of gas in liquid under high pressure was established. The device has the following characteristics: the gas-liquid phase can be well mixed, the balance tank is pressurized by the bottom piston, the maximum measured pressure can reach 40.0 MPa, Sampling under cyclic condition can avoid the secondary equilibrium of the system, the dead volume of the system is smaller, and the temperature control accuracy of the device thermostat is higher (± 0.1 ℃). The solubility of methane in n-hexane at 298.15 K, 303.15 K and 2.0 ~ 12.0 MPa was measured and compared with the literatures. From the experimental data accuracy and repeatability The reliability of the experimental setup was investigated. The relative errors between experimental and literature values were all less than 2.5%. A new method for regression of atmospheric pressure data from high-pressure experimental data was proposed based on the Kricheveky-Kasarnovsky (KK) equation.