Journal of Jishou University(Natural Sciences Edition)

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Experiment of Pressure Swing Adsorption of  CO2/CH4 at Low Temperature Through Coconut Shell Activated Carbon

LIU Xuewu,DU Baoguo,WU Jintao,WANG Xiaojuan,ZOU Jiupeng   

  1. (1.School of Chemical Machinery and Safety,Dalian University of Technology,Dalian 116023,Liaoning China;2.School of Energy and Power Engineering,Dalian University of Technology,Dalian 116023,Liaoning China)
  • Online:2016-03-25 Published:2016-05-11


The natural gas purification technology through pressure swing adsorption (PSA) at low temperature was proposed based on the low temperature processing and the conventional PSA technology applied in liquefied natural gas storage and transport.Coconut shell activated carbon was used for the static adsorption of CO2 and CH4 component gas and the dynamic simulation of adsorption separation of binary mixed CO2/CH4  gas.At  -30~25 ℃,the static volumetric method was used to investigate adsorption behavior of CO2 under the pressure from 1.2~2.5 MPa and that of CH4 under the pressure from 0~4 MPa,respectively.The results showed that the adsorption capacity of coconut shell activated carbon for both CO2 and CH4 increased with the decrease of temperature.Under the pressure of 0.45 MPa,0.85 MPa and 1.85 MPa for the dynamic tests,it was found that the separation factor will continue to increase with the decreases of temperature or pressure for binary mixed CO2/CH4 gas;besides,it was found the effect of temperature is greater than the impact of pressure;furthermore,the dynamic adsorption capacity of CH4 increases at first and then decreases within the range of experiment temperature.The research shows that coconut shell activated carbon for natural gas decarburization has broad application prospects.

Key words: natural gas, coconut shell activated carbon, adsorption capacity, separation factor

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