Limitations of measurements of supercritical CO2 sorption isotherms on coals with manometric equipment - A theoretical description

作者：Jiang, R.; Yu, H.^*; Wang, L.

来源：Bulgarian Chemical Communications, 2017, 49(2): 509-519.

• Adsorption
• CO2
• coal
• uncertainty
• CO2 sequestration

CO2 adsorption isotherms on coals are important for estimating the CO2 sequestration potential of coal beds and enhanced coalbed methane recovery using CO2 injection into coal seams. This paper provides the characteristic of CO2 compressibility factor and density change of CO2 based CO2 Equation of State. The paper investigates the effect of experimental pressure and its error, adsorption/desorption hysteresis, and coal swelling on measurements of supercritical CO2 adsorption isotherms on coals with manometric equipment at high pressure. The results show that the characteristic density-change of CO2 in proper pressure range determines great influence of experimental parameters, coal swelling and adsorption/desorption hysteresis on CO2 adsorption on coal at high pressure. The effect of the hysteresis on sorption at high-pressure may leads to negative observed-adsorption. And coal swelling at high pressure has obvious effect on the precision and reproducibility of CO2 adsorption. There are potential pitfalls of measurements of supercritical CO2 adsorption isotherms on coals with manometric equipment at high pressure.

• 出版日期2017
• 单位山东科技大学