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The first processing step for crude oil in a refinery is

  • A.atmospheric distillation into fractions
  • B.catalytic cracking of the whole crude oil
  • C.hydrotreating it to remove the sulphur
  • D.reforming it to raise the octane number

Answer: A

The crude is separated into fractions before anything is done to any of them, since each fraction needs different treatment. Everything downstream operates on one cut rather than on the whole crude. The tower separates by boiling range alone.

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