M2 - Abstract: The objective of this experiment is to study...

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Abstract: The objective of this experiment is to study the unit operation of gas absorption in a randomly packed 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: 35 mm Head = 260 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 – 260 = 420 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 (1.9 x 10 -3 s -1 ) and theoretically (1.5x10 -2 s -1 ). Also, the height of the liquid phase transfer unit (H L ) was determined experimentally (2.76m) and calculated theoretically (26.62m). It was observed that as the volumetric liquid flow rate (Q L decreases, K L a also decreases which was represented graphically in a plot of K L a Vs V L on logarithmic scale (Figure1). Moreover, it was noticed that there was a direct relation between Q L and H L (i.e. as Q L decreases, H L decreases). Introduction: Absorption of gases into liquids is an important unit operation and efficient operation requires intense mixing of both phases as well as a large gas-liquid interfacial area. There are several types of absorbers and a column, which is
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randomly packed often used in industrial processes. Here, the liquid is distributed over, and trickles down through, the packed bed, thus exposing a large surface to contact the gas. The gas may be absorbed into a solution physically or the latter may involve a reactant in order to enhance the gas absorption rate. Design procedures for the former require only the values of volumetric mass transfer coefficients K L a and K G a and the solubility data. The gas absorption with chemical reaction requires also specific information concerning the reaction rate. In this experiment, CO
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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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M2 - Abstract: The objective of this experiment is to study...

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