Citation: 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(9): 1025-1029. shu

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

1.
School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou 221116, China

Corresponding author: FENG Li,
Received Date: 31 December 2012
Available Online: 5 March 2013
Fund Project: 国家自然科学基金(51274197) (51274197)国家重点基础研究发展规划(973计划, 2012CB214900)。 (973计划, 2012CB214900)

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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沈阳化工大学材料科学与工程学院沈阳 110142

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

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通讯作者: 陈斌, bchen63@163.com

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