manual_lab3.pdf - University of Jordan Faculty of Engineering and Technology Department of Chemical Engineering Chemical Engineering Laboratory(3

manual_lab3.pdf - University of Jordan Faculty of...

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University of Jordan Faculty of Engineering and Technology Department of Chemical Engineering Chemical Engineering Laboratory (3)
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1 Experiment Number -1- Gas absorption Objectives 1. To study the hydrodynamic characteristics of a packed column. 2. To establish a mass balance on the absorbed gas in the column. 3. To determine mass transfer coefficients, the number of transfer units and the effective height equivalent to a transfer unit. Apparatus The equipment consists of a packed column of 2 meters in height and 7.5 cm in diameter, packed with 10mm glass Raschig rings. Air compressor is supplied with a flow meter. Carbon Dioxide cylinder is also available with a flow meter. Water supply tank is available with water pump, and a flow meter to indicate the flow of water. Mercury manometer and water manometer present to indicate the pressure drop across the column. Procedure 1. Fill the water supply tank with water. 2. Make sure that valves V1, V2, and V7 are closed and that V4 and V5 are open. 3. Check that the manometers show zero pressure difference across the column. 4. Switch on air compressor. Adjust valve V2 and take readings of manometers at different values of air flow rates. 5. Repeat again with packed column in wet. 6. Repeat again with different values of water flow rates. 7. To determine mass transfer coefficient, adjust flow rates of water and air so that the condition in the absorption column between flooding point and loading point. 8. Allow Carbon Dioxide to enter the column at certain flow rate. 9. At steady state, take a sample of the liquid going to drain and find the concentration of Carbon Dioxide in it by titrating against NaOH solution.
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2 Theory When a liquid is flowing counter currently to the gas, for low gas flow rates, the effect is as for the wet packing: The pressure drop increases, and the pressure drop follows a square law characteristics. Further increase in gas flow rate or liquid flow rate makes the liquid fails to drain from some sections of the tower. Pressure drop for dry packing (kg.m -2 ) is given by: 𝛥? ? = ? . 𝑔 ? 2 𝜌 𝑔 Where: 𝑔 ? = mass velocity of the gas based on the total cross section of the tower (kg.m -2 .s -1 ) 𝜌 𝑔 = gas density (kg.m -3 ) C= constant which equals to 264 for 10 mm Raschig rings. Pressure drop for wetted packing (kg.m -2 ) is given by: ∆? = 𝛥? ? . ? ? ??𝑔? ? = ? . 𝑔 ? 𝜌 ? Where: 𝑔 ? = liquid flow rate based on the total cross section of the tower (kg.m -2 .s -1 ) 𝜌 ? = liquid density (kg.m -3 ) B= constant which equals to 0.084 for 10 mm Raschig rings. For mass transfer characteristic Consider a packed tower of cross section sectional area A; assume that the effective interfacial area for mass transfer of liquid film on the packing is a ( ? 2 ? 3 ) of the tower volume. The area for mass transfer in small increment of height dh will be a(A.dh) m 2 , and the quantity of solute in the gas passing into solution in this incremental height is d(Gy).
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  • Spring '17
  • Cuong Le Van

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