【摘要】 将SetaramBT2.15微量热仪温度控制系统成功引入恒定容积法,系统测定了低温条件下CH₄,C₂H₄和C₂H₆在甲醇中的溶解度。通过对CO₂在甲醇中溶解度数据的测量,验证测量装置的可靠性。结果表明:在-20—-30℃,CH₄,C₂H₄和C₂H₆在甲醇中的溶解度随温度降低而升高,随分压升高而增大,且CH₄和C₂H₄的溶解度在所测条件下符合亨利定律;而C₂H₆的溶解度在压力升高后,溶解度与压力不符合线性关系。通过PC-SAFT状态方程对所测气体溶解度进行热力学计算,结果表明PC-SAFT状态方程能够很好地关联CH₄,C₂H₄和C₂H₆在甲醇中的溶解度,并可准确描述气体溶解度随温度、压力的变化趋势,所得热力学模型可用于低碳烃吸收的工艺计算中。更多还原

【Abstract】 The solubility of CH₄, C₂H₄ and C₂H₆ in methanol at low temperature and high pressure conditions was determined systematically by constant volume method which was improved by the Setaram BT2.15 temperature control system. The reliability of the determined device was verified by measuring the solubility of CO₂ in methanol. The results indicate that at-20 ℃ to-30 ℃,low temperature and high partial pressure are favorable to the dissolution of CH₄, C₂H₄ and C₂H₆ in methanol and the solubility of CH₄ and C₂H₄ accords with Henry′s law under the measured conditions. However, the solubility of C₂H₆ is not linear with the pressure rising. The PC-SAFT thermodynamic model was also used to calculate the solubility of lower hydrocarbon in methanol. The calculated results are in agreement with the solubility of CH₄, C₂H₄ and C₂H₆ and the PC-SAFT can accurately describe the variation of gas solubility with different temperatures and pressures. The PC-SAFT thermodynamic model can be applied to describe the lower hydrocarbon absorption behavior in methanol.更多还原