Improving extraction yield of humic substances from lignite with anthraquinone in alkaline solution
Improving extraction yield of humic substances from lignite with anthraquinone in alkaline solution
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DOI：
10.1007/s11771-011-0660-3
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发表时间：
2011-02-01
影响因子：
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通讯作者：
Yang Yong-bin
中科院分区：
文献类型：
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作者：
Jaing Tao;Han Gui-hong;Yang Yong-bin
根据褐煤样品的特性，采用傅里叶变换红外光谱（FT-IR）研究了碱性条件下助剂蒽醌（AQ）对褐煤腐殖物质（HS）提取率的影响及其作用机理。结果表明，助剂AQ不仅可以提高HS的提取率，而且可以降低碱用量、提取温度和提取时间。在碱用量9%、AQ用量0.75%、提取温度80 ℃、提取时间30 min、搅拌速度600 r/min、固液比1：3的最佳条件下，HS的提取率达到80.08%，比常规提取提高了20%以上。FT-IR光谱表明，AQ能有效地防止碱将溶解的HS破坏成不溶物，且AQ存在下得到的HS具有更多的-COOR和-COOH基团。
Based on the characteristics of the lignite sample, effects of assistant anthraquinone (AQ) on extraction yield of humic substances (HS) and the action mechanisms of AQ in alkaline condition were studied by Fouvier transform infrared (FT-IR) spectroscopy. The results indicate that assistant AQ can not only increase the extraction yield of HS but also reduce the alkali dosage (NaOH) as well as the extraction temperature and extraction time. Under the optimal conditions of alkali dosage of 9%, AQ dosage of 0.75%, extraction temperature of 80 degrees C, extraction time of 30 min, stirring speed of 600 r/min and solid-to-liquid ratio of 1:3, the extraction yield of HS reaches 80.08%, which is increased by more than 20% compared with the conventional extraction. FT-IR spectra show that AQ is able to prevent dissolved HS from being destroyed into undissolved substance by alkali and HS obtained in the presence of AQ possesses more groups of -COOR and -COOH than that obtained without AQ.