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頂頂頂頂頂　頂頂頂頂頂頂頂頂頂　　　頂頂頂　　　頂頂頂頂
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頂頂　　　頂　　頂頂頂頂頂頂頂頂頂　頂頂頂頂　　頂頂頂頂
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頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂

重油是重质油的简称，其常压沸点一般高于350℃。一般所说的重油是指石油炼制过程中生产的重质油，包括直馏重油和二次加工重油；此外，重油也包括天然的重油，比如直接开采出的重质原油或沥青。

直馏重油包括常压渣油和减压渣油。减压馏分油一般不算作重油，但是其只要掺入减压渣油即为重油。直馏重油基本上没有经过化学变化，是原油中固有的高沸点组分。

二次加工重油是指石油馏分经过二次加工（烃类分子发生化学变化）后副产的高沸点组分，比如裂解焦油、热裂化渣油、催化裂化油浆等。二次加工重油的化学结构与原料差别很大，通常含有较多的芳香族环状结构化合物。

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辛苦了

代表广大会员向楼主致敬

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