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The mean residence time obtained from an E curve is

  • A.the variance of the distribution
  • B.the first moment of the distribution
  • C.the time at which the curve peaks
  • D.the time at which the curve reaches zero

Answer: B

The mean is the area weighted average of time, which for a skewed distribution differs from the peak. For a well behaved reactor it should equal the volume divided by the volumetric flow. A shortfall points to dead volume.

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