petroleum coke middle sulphur

例句：

1. 1. The oil refinery produces petroleum coke for the chemical industry.
   炼油厂生产石油焦供应化工行业。
2. 2.The middle sulphur is used in the production of fertilizers.
   中间硫磺用于肥料的生产。
3. 3. The petroleum coke is a byproduct of the refining process.
   石油焦是精炼过程的副产品。