The influence of reduction and reductive alkylation on thermal properties of coals

被引:1
作者
Kozlowski, M [1 ]
机构
[1] Adam Mickiewicz Univ Poznan, Fac Chem, PL-60780 Poznan, Poland
关键词
coal; reduction; reductive alkylation; thermal analysis;
D O I
10.1016/S0378-3820(02)00044-9
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Two samples of Polish different rank coals have been subjected to reduction and reductive alkylation in the potassium/liquid ammonia system. The samples have been studied by dilatometric (the Audibert-Arnu method), plastometric (the Giseler-Hoehne method) and thermogravimetric methods. The low-molecular-weight substances generated in the coal under the effect of potassium in liquid ammonia were found responsible for a great increase of dilatation and a shift of the softening temperature and the temperature of the maximum contraction towards lower temperatures. It was also shown that fragmentation of the coal structure led to a decrease of the temperature of the beginning of plasticity, the temperature of the maximum plasticity and to an increase of the index of maximum plasticity. The influence of C- and O-alkylation on the results of the thermal analysis was also discussed. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:61 / 66
页数:6
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