M2aa - Sample Calculation: (Based on Run 1) * From Table at...

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Sample Calculation: (Based on Run 1) * From Table at page 140 => 35 mm = 260 cm 3 /min * q (cm 3 /min) = gas in – gas out => 680 – 260 = 420 cm 3 /min * q (kmol/s) = 420 ml / min * 1 min / 60 s * 1 L / 1000 ml * gmol / 22.4 L * 273.15 k / 298.15 k * kmol / 1000 mol = 2.86x10 -7 kmol/s * Q L (m 3 /s) = 1000 s cm x m cm 60 min 1 * 10 1 1 * min 3 6 3 3 = 1.67 x 10 -5 m 3 /s * V L (m/s) = 2 5 2 ) 0635 . 0 ( 4 10 67 . 1 4 π - = = x D Q s Q L L = 5.26 x 10 -3 m/s water flowrate (cm 3 /min) gas out (cm 3 /min) q (cm 3 /min) q (kmol/s) Q L (m 3 /s) V L (m/s) 1000 260 420 2.86x10 -7 1.67x10 -5 5.26x10 -3 * K L a = - = - - - - 5 7 3 * * 10 67 . 1 10 68 . 2 71489 71489 . 0 ln 308 . 0 10 26 . 5 ln x x x Q q C C H v L L = 1.9 x 10 -3 s -1 ) 10 3 - * Percentage Error = (26.62 – 13.54) / 26.62 = 49.12 % Abstract: The objective of this experiment is to study the unit operation of gas absorption in a randomly packed CONSTANTS: c* = 0.71489 g / 100cm gas inlet = 680 cm 3 /min gas density = 1.76x10 -3 g/ml Area(s) = 3.17x10 -3 m 2 Diffusivity(D) = 1.87x10 -9 m 2 /s w ρ = 995 kg/m 3 w μ = 7.65x10 -4 N.s/m 2 α = 686 n = 0.28 1 2 5 . 0 9 4 28 . 0 1 4 5 9 5 . 0 1 10 5 . 1 10 87 . 1 * 995 10 65 . 7 10 65 . 7 10 26 . 5 * 995 ) 686 ( 10 87 . 1 - - - - - - - - = = = s x x x x x x D v D a K n L L m x x x x D v H n L L 62 . 26 10 87 . 1 * 995 10 65 . 7 10 65 . 7 10 26 . 5 * 995 686 / 1 / 1 5 . 0 9 4 28 . 0 4 5 5 . 0 = = = - - - 0.1625 0.1625- 2.86x10 -7 1.67x10 -5 1.67x10 -5 1.9 x 10 -3 ( 3.17x10 -3 ) =
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column and to determine the volumetric mass transfer coefficients. In this experiment, the liquid (water) flow rate was changed for each run ranging from 1000 ml/min to 0 ml/min in a total of 11 runs. However, the gas (CO 2 ) inlet flow rate was kept constant at 680 ml/min. The corresponding gas outlet flow rate was measured (for run1: 38 mm Head = 278 ml/min). It was observed that there is a decrease in the gas outlet flow rate, which occurred due to absorption. The quantity absorbed is the difference between the inlet and outlet gas flow rates (680 – 278 = 204 ml/min). The mass transfer coefficient depends on the area of the column. The volumetric liquid side mass transfer coefficient (K L a) was determined experimentally (3.89x10 -4 s -1 ) and theoretically (1.5x10 -2 s -1 ). Also, the height of the liquid phase transfer unit (H
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This note was uploaded on 09/27/2011 for the course CHEMICAL E CHE 309 taught by Professor M.elgaily during the Fall '09 term at King Fahd University of Petroleum & Minerals.

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M2aa - Sample Calculation: (Based on Run 1) * From Table at...

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