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Volume translation applied to a cubic equation of state

  • A.converts the cubic into a quartic equation in volume
  • B.removes any need for an alpha function in the equation
  • C.shifts the calculated volume to improve liquid density predictions
  • D.changes the predicted vapour pressures of the fluid very substantially

Answer: C

A constant shift corrects the liquid root without altering the phase equilibrium calculation, since the same shift applies on both sides. It is a cheap and widely used repair. Peng-Robinson with translation is a common simulator default.

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