Reaction property of coal tar and its fractions in supercritical water
Reaction property of coal tar and its fractions in supercritical water
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发表时间：
2008
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通讯作者：
B. Ji-cheng
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作者：
B. Ji-cheng
采用间歇式反应器研究了3种煤焦油及其馏分在超临界水中的转化反应，结果表明，沥青质含量最高的煤焦油转化率最高，可获得更多的轻质产物;沥青质是煤焦油的主要活性组分，在超临界水中可转化为沥青质、气体和半焦;与N2中热解相比，沥青质在超临界水中的转化率最高。热解产物分析表明，沥青质分子的芳核主要由1~4环芳香族化合物组成，沥青质转化为气体的比例不到10%，煤焦油在超临界水中的反应特性表明，煤焦油在超临界水中的反应是稳定的。
Conversions of 3 coal tars and their fractions in supercritical water(SCW) were investigated using a batch reactor.The results indicate that the conversion of the coal tar which has the highest content of asphaltene can obtain more light-product compared with the other two coal tars.It is also noticed that asphaltene is the main active component and it converts to maltene,gas and char in SCW.Compared with pyrolysis in N2,the conversion of asphaltene to maltene is enhanced while the formation of gas and char is restrained in SCW.Based on analysis of pyrolysis product,it is deduced that aromatic nucleus of asphaltene molecule is mainly composed of 1～4 rings aromatic compounds.Moreover,less than 10% of maltene fraction converts to gas,asphaltene and char.The fraction of char is very stable in SCW.Reaction pathway of coal tar in SCW is proposed from the reaction property of each fraction.