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Solution

From equation 11.114, the light key (A) is heptane and the heavy key (B) is octane. With q = 1 then:

The required value of 9 must satisfy the relation aB < 9 < aA, that is 1.0 < 9 < 2.22. Assuming 9 = 1 . 15, then:

This is near enough and from equation 11.115:

'2.70 x 0.534\ /2.22 x 0.453\ /1.00 x 0.013\ _ 2.70 - 1.17 ) + V 2.22 - 1.17 ) + V 1-00 - 1.17 ) ~ ' 7 Thus: Rm 0.827

11.7.6. Number of plates at total reflux

The number of plates required for a desired separation under conditions of total reflux can be found by applying Fenske's equation, equation 11.59, to the two key components.

Example 11.17

For the separation of hexane, heptane, and octane as in Example 11.16, determine the number of theoretical plates required.

Solution

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