化工学报 ›› 2010, Vol. 61 ›› Issue (6): 1341-1348.

• 热力学 •    下一篇

水合物存在条件下CH4和CO2在溶液中溶解度计算

李遵照;郭绪强;田欢   

  1. 中国石油大学(北京)重质油国家重点实验室
  • 出版日期:2010-06-05 发布日期:2010-06-05

Calculation for solubility of methane and carbon dioxidein water in presence of hydrate

LI Zunzhao;GUO Xuqiang;TIAN Huan   

  • Online:2010-06-05 Published:2010-06-05

PDF (PC)

271

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van der 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。

关键词:

溶解度, 二氧化碳, 甲烷, 水合物

Abstract:

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.

Key words:

溶解度, 二氧化碳, 甲烷, 水合物

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