L11 - CHEE 3462 Lecture 11 o m o > m Depends on the slopes...

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CHEE 3462 – Lecture 11 η o η m Depends on the slopes of the equilibrium curve & operating line η o > η m (Slope) eqbm > (Slope) op. Line Mostly true for stripping section B A Example η m = 0.5 A B 1 ideal plates but 1.7 real plates η o = 1/1.7 ~ 0.6
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• If (Slope) eqbm = (Slope) op. Line then η o = η m η o < η m if (Slope) eqbm < (Slope) op. Line ~ mostly true for Rect. Section • When equilibrium & operation lines are Straight (e.g. in Absorption) y * a y * b a y b y ln y * a a y y * b b y ln I N = y ' a y ' b a y b y ln y ' a a y y ' b b y ln R N = y ' a y ' b a y b y ln ) y ' a a y ( m ) y ' b b y ( m ln R N η η =
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( Since ) where * a a ' a a * b b ' b b m y y y y y y y y = = η * a * b a b ' a ' b a b ' a ' b a b R I o y y ln y y y y ln y y ln y y y y ln N N = = η L mV y y y y ln a b * a * b = a b * a * b y y y y ( ) ( ) ( ) ( ) ( ) * a * b m a b m a b * a a m a * b b m b ' a ' b y y y y y y y y y y y y y y η + η = η + η =
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