A packed bed column is to be designed for the absorption of ethanol from ethanol- CO...

 

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A packed bed column is to be designed for the absorption of ethanol from ethanol- CO gas mixture by fresh water. The column will be operated under counter-current mode and its operating conditions will be 25C and 101.32 kPa. Following design data may be used in the calculations: Packing material: Feed gas: 38 mm metal Raschig rings Flow rate = 2.0 kg/s at 25C and 101.32 kPa (Composition: 4 mole% ethanol and the balance CO) Flow rate = 1.1 kg/s at 25C Composition: 0.08 mole% ethanol and the balance CO Feed fresh water: Product gas: The column is to be designed such that it will operate normally at 70% of flooding velocity. Determine the a) column diameter b) pressure drop of the entire packed bed if packed bed height is 5 m c) size of the electric motor (efficiency is 70%) attached to a blower that is pumping the gas into the column Other useful fluid properties: At 25C: PL = 997 kg/m pv at inlet = 1.8 kg/m Average molecular weight of inlet gas = 44 kg/kmol Hv = 1.5 x 105 Pa.s HL= 1.00 x 10 Pa.s Owater = 70 x 10 N/m A packed bed column is to be designed for the absorption of ethanol from ethanol- CO gas mixture by fresh water. The column will be operated under counter-current mode and its operating conditions will be 25C and 101.32 kPa. Following design data may be used in the calculations: Packing material: Feed gas: 38 mm metal Raschig rings Flow rate = 2.0 kg/s at 25C and 101.32 kPa (Composition: 4 mole% ethanol and the balance CO) Flow rate = 1.1 kg/s at 25C Composition: 0.08 mole% ethanol and the balance CO Feed fresh water: Product gas: The column is to be designed such that it will operate normally at 70% of flooding velocity. Determine the a) column diameter b) pressure drop of the entire packed bed if packed bed height is 5 m c) size of the electric motor (efficiency is 70%) attached to a blower that is pumping the gas into the column Other useful fluid properties: At 25C: PL = 997 kg/m pv at inlet = 1.8 kg/m Average molecular weight of inlet gas = 44 kg/kmol Hv = 1.5 x 105 Pa.s HL= 1.00 x 10 Pa.s Owater = 70 x 10 N/m