Question: 4 Y 9 . Ponchon - Savarit ( Prob . 1 3 - 3 in Luyben, Chemical Process Analysis ) The column of the preceding

4

9 .

Ponchon

-

Savarit

(

Prob

. 13 - 3

in Luyben, Chemical Process Analysis

)

The column of the preceding problem was designed

20

years ago and has been operating ever since. Energy costs have risen, and it is now desired to reduce operating costs. One suggestion is to heat the feed to

200 F

using waste heat, thus, perhaps, operating at a lower reflux ratio and reducing the reboiler duty. Can this be done? Will we have to change the column feed point? What will be the new reboiler heat duty?

4Y9. Ponchon-Savarit (Prob.13-3 in Luyben, Chemical Process Analysis) The column of

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