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Neutralisation in oil refining removes

  • A.Phospholipids
  • B.Colour pigments
  • C.Waxes
  • D.Free fatty acids, as soapstock

Answer: D

Caustic soda converts the free acids to soaps that are separated by centrifuge, and the loss includes some neutral oil carried with them. Physical refining strips the acids by steam distillation instead and avoids the soapstock altogether.

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