Volume 42 Issue 04
Apr.  2014
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Article Navigation >  Journal of Fuel Chemistry and Technology  > 2014  >  42(04): 385-391
LIU Xiang-chun, FENG Li, WANG Xin-hua, ZHANG Man, SHI Xiao-feng. Effect of K+, Na+, Ca2+ and Mg2+ on equilibrium adsorption of water content of Shengli lignite[J]. Journal of Fuel Chemistry and Technology, 2014, 42(04): 385-391.
Citation: LIU Xiang-chun, FENG Li, WANG Xin-hua, ZHANG Man, SHI Xiao-feng. Effect of K+, Na+, Ca2+ and Mg2+ on equilibrium adsorption of water content of Shengli lignite[J]. Journal of Fuel Chemistry and Technology, 2014, 42(04): 385-391.
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Effect of K+, Na+, Ca2+ and Mg2+ on equilibrium adsorption of water content of Shengli lignite

  • School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou 221116, China

  • Received Date: 2013-10-27
  • Rev Recd Date: 2013-12-22
  • Publish Date: 2014-04-30
    Abstract
  • To investigate the effects of cations on equilibrium re-adsorption water content of lignite, the acid-washed Shengli lignite was exchanged with different concentrations of K2SO4, Na2SO4, MgSO4, Ca(CH2COOH)2 solution, respectively. Ion-exchange process was characterized by the changes in wavenumber of carboxyl group and the ash contents. The equilibrium adsorption water contents of all samples were determined in a range of relative humidities. It is shown that the extent of ion-exchanged exchange in Shengli coal is in order of Ca2+>Na+>K+>Mg2+. The relative effectiveness of cations in increasing the equilibrium adsorption water content is in order of Mg2+>Ca2+>Na+≈K+. At high relative humidity, the factor that control equilibrium adsorption water content is free water molecules interactions. However, at middle relative humidity capillary force between metal cation-carboxyl group complex and capillary is more important. At low relative humidity water interactions with sorption sites which are cation-carboxyl group complex become more important.
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