Effect of Ca<sup>2+</sup> content loaded in Shengli lignite on its equilibrium re-adsorption water content

LIU Xiang-chun; FENG Li; WANG Xin-hua; ZHANG Man; ZHANG Ying

Volume 41 Issue 09

Sep. 2013

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LIU Xiang-chun, FENG Li, WANG Xin-hua, ZHANG Man, ZHANG Ying. Effect of Ca2+ content loaded in Shengli lignite on its equilibrium re-adsorption water content[J]. Journal of Fuel Chemistry and Technology, 2013, 41(09): 1025-1029.

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LIU Xiang-chun, FENG Li, WANG Xin-hua, ZHANG Man, ZHANG Ying. Effect of Ca²⁺ content loaded in Shengli lignite on its equilibrium re-adsorption water content[J]. Journal of Fuel Chemistry and Technology, 2013, 41(09): 1025-1029.

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Effect of Ca²⁺ content loaded in Shengli lignite on its equilibrium re-adsorption water content

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

Received Date: 2012-12-31
Rev Recd Date: 2013-03-05
Publish Date: 2013-09-30

Abstract

Abstract

Shengli lignite has been acid-washed. The chemical composition of ash from the raw sample was determined by X-ray Fluorescence (XRF). The acid-washed lignite was subsequently exchanged with different concentrations of Ca(CH₂COOH)₂ solution. Ion-exchange process was characterized by FT-IR, the ash content and pH value. The re-adsorption water contents of treated and raw samples were determined across a range of relative vapor pressures. The extend of ion-exchange reaction between Ca(CH₃COO)₂ and -COOH groups was controlled by the concentration of Ca(CH₂COOH)₂ solution. The effects of Ca²⁺ on equilibrium re-adsorption water values varied depending on relative vapor pressures and the amount of loaded Ca²⁺. Furthermore, the factor that controls equilibrium re-adsorption water content at relative vapor pressure of 92% or less is capillary force between Ca²⁺-carboxyl group complex and capillary. However, at higher relative vapor pressure the key factor becomes interactions of free water molecules.
- ion-exchange,
- relative vapor pressure,
- equilibrium re-adsorption water content

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