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If the fractional recovery of light key in the distillate is FR, then light key in the feed is

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If the fractional recovery of light key in the distillate is FR, then light key in the feed is

(a) DxD= (FRD)+FxLK

(b) DxD= (FRD)/FxLK

(c) DxD= (FRD)FxLK

(d) DxD= (FRD)

I have been asked this question by my school principal while I was bunking the class.

The origin of the question is Key Components of Multi component Distillation topic in portion Key Fractionation Concepts of Distillation Design

1 Answer

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Correct option is (c) DxD= (FRD)FxLK

Easy explanation: The definition of the fractional recovery is DxD= (FRD) FxLK, while gives us the material balance on feed and distillate DxD= (FRD).

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