沥青烯是煤直接液化后产物中分离出的物质，可溶于苯但不溶于正己烷或环己烷，类似于石油沥青质的重质煤液化产物，是混合物，平均分子量约为500。
n. asphaltene
现在高浓度的沥青烯以及其他的杂质对原油的输送和加工造成了困难。
Now the high concentration of asphaltene and other impurities on the transport and processing of crude oil caused difficulties.
随反应时间的延长，前沥青烯和沥青烯产率出现最大值，油气产率逐渐增加。
With the extend of time, the yield of preasphaltene and asphaltene reaches the maximum and the yield of oil and gas gradually increases.
研究结果表明：在反应起始阶段，煤主要转化为前沥青烯和沥青烯，有少量油气存在。
The results show that in the initial phase of reaction, coal is mainly converted to preasphaltene, asphaltene and a little oil and gas.
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