Modification of coal by subcritical steam: an examination of modified Illinois no. 6 coal
Modification of coal by subcritical steam: an examination of modified Illinois no. 6 coal
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DOI：
10.1021/ef00016a012
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发表时间：
1989-07
期刊：
影响因子：
5.3
通讯作者：
S. Brandes;R. Graff;M. L. Gorbaty;M. Siskin
中科院分区：
文献类型：
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作者：
S. Brandes;R. Graff;M. L. Gorbaty;M. Siskin
蒸汽处理过的煤在水中的膨胀比原煤大得多。这意味着经过蒸汽处理的煤具有更强的亲水性。它的氢键程度较低，具有与原煤不同的红外光谱。元素分析表明，处理后的煤中有机氧含量显著降低。然而，经过处理的煤与标记的甲基碘进行温和的O-烷基化反应，与对原煤进行的相同程序一样，引入了两倍于13C的浓缩。可以得出结论，水蒸气改性煤的羟基含量是原煤的两倍。据推测，蒸汽与煤中的醚键反应，形成羟基，从而大大减少了煤结构中重要的共价交联物的存在
Steam-treated coal swells considerably more than the raw coal in water. This implies that the steam-treated coal is more hydrophilic. It exhibits a lower degree of hydrogen bonding and has an IR spectrum different from that of raw coal. Elemental analysis of treated coal shows a significant decrease in organic oxygen content. A mild O-alkylation of treated coal with labeled methyl iodide, however, introduces twice the enrichment by 13 C as does the same procedure carried out on raw coal. It may be concluded that steam-modified coal contains twice as many hydroxyl groups as raw coal. It is postulated that steam reacts with the ether linkages in coal, forming hydroxyl groups and thereby substantially reducing the presence of an important covalent cross-link in the coal structure