Conversion of a Wide Range of Low-Rank Coals into Upgraded Coals and Thermoplastic Extracts Having Similar Chemical and Physical Properties Using Degradative Hydrothermal Extraction
Conversion of a Wide Range of Low-Rank Coals into Upgraded Coals and Thermoplastic Extracts Having Similar Chemical and Physical Properties Using Degradative Hydrothermal Extraction
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DOI：
10.1021/ef100117e
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发表时间：
2010-04
期刊：
影响因子：
5.3
通讯作者：
Masato Morimoto;H. Nakagawa;K. Miura
中科院分区：
文献类型：
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作者：
Masato Morimoto;H. Nakagawa;K. Miura
我们最近提出了一种在低于350°C的热水中通过水热降解抽提将低变质煤转化为精煤和热塑性抽提物的方法。为了检验该方法的有效性，并对得到的改质煤和热塑性抽提物进行了更详细的表征，对7种低变质煤、一种生物质、一种O-甲基化褐煤、一种油岩和一种烟煤在300℃或350℃下进行了水热降解抽提，发现改善后的煤元素组成相当接近，碳和氧的含量大于71%和小于23%。这意味着在干无灰(DAF)样品的基础上，热值远高于30MJ/kg。在350℃下获得的各种样品的固体萃取物(沉积物)在元素组成、分子量分布、热解行为和软化/熔融行为等方面非常接近。
We have recently presented a method that converts low-rank coal into upgraded coal and thermoplastic extract through the hydrothermal degradative extraction in a flow of hot water at less than 350 °C. To examine the validity of the presented method and to characterize the upgraded coals and the thermoplastic extracts obtained in more detail, seven kinds of low-rank coals, a biomass, an O-methylated brown coal, an oil rock, and a bituminous coal were subjected to the hydrothermal degradative extraction at either 300 or 350 °C. The elemental compositions of the upgraded coals were found to be rather close to each other, and their carbon and oxygen contents were larger than 71% and less than 23%, respectively, meaning that the heating values are well over 30 MJ/kg on a dry ash-free (daf) sample basis. The solid extracts (deposits) obtained at 350 °C from the variety of samples were very close to each other in elemental composition, molecular-weight distributions, pyrolysis behavior, and softening/melting beh...