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# L7 - Lecture 7 Unit Ops CHEE 3462 Feed Plate L = L qF At...

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Lecture 7 Unit Ops CHEE 3462

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Feed Plate At point a, If < 1 At point b, feed at Bubble Point Where q = 1 and At point c, between Bubble Pt & Dew Pt Where q = fraction of feed that is liquid [ = (1-f ) in flash distillation ] and 0 < q < 1 BP DP a b c d e qF L L + = T T T C q F b pL λ ) ( 1 + F q V V ) 1 ( + = qF L F L L + = + = V V = qF L L + = F q V V ) 1 ( + =
At point d, feed at Dew Point Where q=0 At point e, above Dew Point (superheated vapor) C pv = Specific heat T F = Feed Temperature T d = Dew Point Temperature BP DP a b c d e L L = F V F q V V + = + = ) 1 ( V L L = F V V V + + = λ ) ( d F pv T T C F V q = =

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Note: qF L L + = F q V V ) 1 ( + = for all cases. Feed plate occurs at the intersection of the Rect. and Stripping operation lines Rect. Op line Stripping Op line Subtracting the two Op lines gives D Dx Lx Vy + = B Bx x L y V = B D Bx Dx x L L y V V + + = ) ( ) (
F q Fx x F q qF y F ) 1 ( ) 1 ( + = ) ( ) ( ) ( ) ( V V Bx Dx x V V L L y B D + + = Feed Line Equation becomes ) 1 ( ) 1 ( q x x q q y F + = ( x f , x f ) q = 1 @ BP q > 1 0 < q < 1 q = 0 @ DP q < 0 •Similar to flash distillation mass balance equation •Slope •Passes thru ) 1 ( q q = ( x F , x F ) x f

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Drawing Op Lines & Ideal Plates ( x F , x F ) x F ( x D , x D
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L7 - Lecture 7 Unit Ops CHEE 3462 Feed Plate L = L qF At...

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