Effects of ion-exchanged calcium, barium and magnesium on cross-linking reactions during direct liquefaction of oxidized lignite
Effects of ion-exchanged calcium, barium and magnesium on cross-linking reactions during direct liquefaction of oxidized lignite
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离子交换钙、钡、镁对氧化褐煤直接液化交联反应的影响
DOI：
10.1016/j.fuproc.2011.10.007
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发表时间：
2012-02
期刊：
影响因子：
--
通讯作者：
Wen Li
中科院分区：
文献类型：
--
作者：
Zongqing Bai;Zhiqing Wang;Jin Bai;Zhenxing Guo;Wen Li
本文研究了碱土金属对褐煤直接液化过程中交联反应的影响。以氧化褐煤为模型煤，研究了钙、钡、镁离子交换对氧化褐煤直接液化过程中CLR的影响。氧化褐煤已被证明适合于定量考察直接液化过程中CLR的程度。用液化后四氢呋喃（THF）不溶性固体产物的量来定量评价离子交换煤液化过程中的CLR。结果表明，氧化煤适合定量检测CLR的程度，目标离子以高度分散的离子形式交换到氧化煤中。离子交换的Mg2+在煤的低温和高温直接液化过程中抑制了CLR。然而，交换的Ca2+总是在选定的温度下促进CLR。交换的Ba2+在低温下促进CLR，在高温下抑制CLR。
In this work the influences of alkaline earth metals on cross-linking reactions (CLRs) during direct liquefaction of lignite were investigated. The oxidized lignite, which has been proved to be appropriate for quantitatively examine the extent of CLR during direct liquefaction, was used as a model coal to study the effects of ion-exchanged calcium, barium and magnesium on CLR during direct liquefaction of the oxidized lignite. The amounts of tetrahydrofuran (THF) insoluble solid products after liquefaction were used to quantitatively evaluate the CLR during liquefaction of the ion-exchanged coal. The results show that the oxidized coal is appropriate to quantitatively examine the extent of CLR and the targeted ions are exchanged to the oxidized coal in the form of highly-dispersed ion. The ion-exchanged Mg2+suppresses the CLR during direct liquefaction of coal at both low and high temperature. However, the exchanged Ca2+always promotes the CLR at the selected temperatures. While the exchanged Ba2+promotes the CLR at low temperature, but suppresses it at high temperature.
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