Citation: HUANG Xin, ZHANG Shu, LIN Xiong-chao, WANG Yong-gang, XU Min. Deoxygenation effect on hydrophilicity changes of Shengli lignite during pressurized pyrolysis at low temperature[J]. Journal of Fuel Chemistry and Technology, ;2013, 41(12): 1409-1414. shu

Deoxygenation effect on hydrophilicity changes of Shengli lignite during pressurized pyrolysis at low temperature

1.
School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, China

Corresponding author: ZHANG Shu, WANG Yong-gang,
Received Date: 14 May 2013
Available Online: 12 September 2013
Fund Project:

The effect of temperature (200~350 ℃) and pressure (0.25~8.00 MPa) on the elimination of main oxygen-containing functional groups of Shengli lignite was examined during pyrolysis in a fixed-bed reactor. Effects of the reduction of oxygen-containing functional groups on the moisture holding capacity (MHC) of coal samples were also investigated. The results showed that temperature was the key factor on the removal of carboxyl and phenolic hydroxyl from the lignite. The variation of pressure had few effects on the removal of carboxyl in coal; in contrast, phenolic hydroxyl was reduced to a minimum point at the pressure between 3.00 to 4.00 MPa. The carboxyl content in the lignite played a dominant role on the surface polarity and moisture holding capacity. The influence of specific surface area on the MHC became distinct when the carboxyl content in coal samples kept constant.
- fixed-bed reactor,
- pyrolysis,
- oxygen-containing functional groups,
- moisture holding capacity
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