Determination of O-containing functional groups distribution in low-rank coals by chemical titration

ZHOU Jian-lin; WANG Yong-gang; HUANG Xin; ZHANG Shu; LIN Xiong-chao

Volume 41 Issue 02

Feb. 2013

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Article Navigation > Journal of Fuel Chemistry and Technology > 2013 > 41(02): 134-138

ZHOU Jian-lin, WANG Yong-gang, HUANG Xin, ZHANG Shu, LIN Xiong-chao. Determination of O-containing functional groups distribution in low-rank coals by chemical titration[J]. Journal of Fuel Chemistry and Technology, 2013, 41(02): 134-138.

Citation:

ZHOU Jian-lin, WANG Yong-gang, HUANG Xin, ZHANG Shu, LIN Xiong-chao. Determination of O-containing functional groups distribution in low-rank coals by chemical titration[J]. Journal of Fuel Chemistry and Technology, 2013, 41(02): 134-138.

Citation:

ZHOU Jian-lin, WANG Yong-gang, HUANG Xin, ZHANG Shu, LIN Xiong-chao. Determination of O-containing functional groups distribution in low-rank coals by chemical titration[J]. Journal of Fuel Chemistry and Technology, 2013, 41(02): 134-138.

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Determination of O-containing functional groups distribution in low-rank coals by chemical titration

School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China

Received Date: 2012-09-11
Rev Recd Date: 2012-12-01
Publish Date: 2013-02-28

Abstract

Abstract

Distribution of oxygen-functional groups (carboxyl, alcohol-hydroxyl, phenol-hydroxyl, methoxyl and carbonyl) in 4 Chinese low-rank coals was evaluated based on chemical analysis. Concentration of carboxyl was quantitated by acetic acid calcium ion exchange method and the buffer (pH=8.3). The effect of analysis condition on the concentration of carboxyl and total acidity was studied. The results show that the reliable results are obtained in N₂ atmosphere other than in air. The occurrence of carboxyl in coal is carboxylate. When quantitating the concentration of phenol-hydroxyl in the acid-washing brown coal with ion exchanged method, its concentration increases with increasing pH value. Concentration of carboxyl and hydroxyl account for 34.49% and 34.79%, respectively, in the total oxygen for the dry ash free basis brown coal. Different concentrations of carbonyl exist in the low-rank coals, but that of methoxyl is little.
- low-rank coal,
- O-containing functional groups,
- occurrence,
- chemical titration

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References(19)

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