Lab 5 Experiment of Absorption I. Objectives 1. Unde rstand the configuration of an absorption column 2. Determine the overall volumetric gas phase mass transfer coefficient ,K Yα 3. Understand the characteristics of single-film resistance. II. Principles In gas absorption process, a ponent is absorbed by contacting with a liquid phase, in which ponent is soluble. In this experiment, water is used to remove ammonia from air. The absorption of NH 3 in water is gas phase controlled. The gas phase coefficient approximately equals to the overall mass-transfer coefficient. Based on this, the overall volumetric mass-transfer coefficient can be evaluated. When the mole fraction of solute in liquid is less than 10%, the equilibrium correlation obeys Henry ’s law. The overall mass-transfer coefficient is?? m YYh YYGK???? 21?() where, h= height of packed section ,m K Yα= overall volumetric gas phase mass transfer coefficient , kmol/m 3﹒h Y= mole ratio of solute to solvent in gas phase; Y 1, inlet value; and Y 2, outlet value ΔY m= logarithm average driving force for gas phase III. Apparatus (1). A mmonia absorption apparatus and the process Figure presents a diagram of the gas absorption unit to be employed in this experiment. This unit consists of3 rotameters, 4 manometers, 2 thermometers, 2 buffer tanks, an effluent gas analyzer and an absorption tower. An air-ammonia mixture i
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