石油焦是炼油工艺的副产品，具有低灰分、一定挥发份和高热值的特性。
As a byproduct of crude refining process petroleum coke features a low ash content, moderate volatility and a high heating value.
辽河催化裂化澄清油中芳烃含量高、沥青质含量低、分子量分布窄，是生产针状焦的优质原料，但其所含的灰分对澄清油的加工利用有着较大影响。
Liaohe FCCDO is a better raw material to produce needle coke because it has a high content of aromatics, low content of asphalt and narrow distribution of molecular weight.
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