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摘要: 采用间歇超临界水(supercritical water, SCW)反应器,考察了反应温度(400℃~480℃)、停留时间(1 min~80 min)和反应压力(25 MPa~40 MPa)对煤焦油沥青轻质化的影响。与常压N2热解相比,煤焦油沥青在SCW中反应后产物中的轻油质量分数高,残焦质量分数低,表明SCW可以促进煤焦油沥青的轻质化反应进行并抑制缩合反应。沥青质是煤焦油沥青在SCW中发生反应的主要组分。在440 ℃和34 MPa时反应20 min,产物中轻油的质量分数可达原料的两倍,说明煤焦油沥青在SCW中可以发生明显轻质化反应。与温度相比,压力和停留时间的影响相对较小。Abstract: Conversion of coaltar pitch in supercritical water (SCW) was researched using a batch reactor. The effects of temperature (400℃~480℃), pressure (25MPa~40MPa), and residence time (1min~80min) on product composition were investigated. When compared with pyrolysis under N2 atmosphere, the conversion of asphaltene to maltene was enhanced, whereas, the formation of gas and char were restrained in SCW. Moreover the yields of high value chemicals were higher than those obtained via pyrolysis. The results suggest that SCW promotes the decomposition of coaltar pitch into maltene and enhances the yields of high value chemicals. It is also observed that asphaltene is the main active component and it is converted to maltene, gas, and char in SCW. High temperature promotes the reactions of both asphaltene to light components and the formation of char. The results indicate that temperature appears to be the important parameter for coal tar pitch conversion, whereas, the effects of pressure and time are less significant.
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Key words:
- coaltar pitch /
- supercritical water /
- upgrading
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