摘要
实验测定了在不同温度、压力条件下,水合物存在时CO2和CH4在水溶液中的溶解度。将Chen-Guo水合物模型和拓展的P-T状态方程应用到水合物存在条件下CH4和CO2在溶液中的溶解度计算,对于V-Lw-H三相条件下CH4和CO2在液相中的溶解度取得了较高的计算精度。本文将vander Waals-Platteeuw模型和拓展的P-T状态方程结合,建立了用于计算高于三相平衡压力条件下CH4和CO2在液相中溶解度的模型。考察了系统压力对CH4和CO2在液相中溶解度的影响。结果表明,压力增加会显著影响CH4和CO2在其溶液中的溶解度。模型基于两点假设经过改进后具有较高的计算精度,能够用于水合物存在条件下CH4和CO2在液相中溶解度的计算。
The solubilities of CO2 and CH4 in pure water in the presence of gas hydrate were measured under different conditions.The Chen-Guo hydrate model combining with the extended P-T equation of state was used to calculate the hydrate-liquid phase equilibrium of CO2-H2O and CH4-H2O systems at V-Lw-H equilibrium condition,and reliable predictions were obtained in a wide range of temperature and pressure.A model was proposed to evaluate the effect of pressure on the solubilities of CO2 and CH4 by using the P-T equation of state and the van der Waals and Platteeuw model.The calculated results indicate that from thermodynamic equilibrium the pressure has a significant effect on the solubility values.Based on the two assumptions the model is improved and can be used to calculate the solubilities of CH4 and CO2 in pure water.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2010年第6期1341-1348,共8页
CIESC Journal
基金
国家自然科学基金项目(20676146)
国家高技术研究发展计划项目(2006AA09A208)
国家重点基础研究发展计划项目(2009CB219504)
高等学校博士学科点专项科研基金项目(20070425001)~~
关键词
溶解度
二氧化碳
甲烷
水合物
solubility
carbon dioxide
methane
hydrate
