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The main limitation of one parameter models is that they

  • A.cannot distinguish the causes of a spread
  • B.work only for a single irreversible reaction
  • C.cannot be fitted to any real data
  • D.apply only to gas phase systems

Answer: A

Correct answer: cannot distinguish the causes of a spread

A single parameter fitted to a tracer curve reproduces the width of the distribution and nothing more. Bypassing, dead volume, channelling and genuine axial mixing can give similar variances by quite different mechanisms, and the model cannot tell them apart - so it may predict conversion adequately while pointing at the wrong fault, and the shape of the curve must be examined as well as its variance.

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