Abstract
Packed and tray columns are widely used in the study of gas-liquid interaction during mass and heat transfer process. There exist a variety of column configurations and each design is performed according to specific purposes, such as nature of processing feed, number of components, product streams, type of operation, etc. Continuous contact between phases allows mass transfer, which is the case of process like absorption, distillation and extraction were fluid phases can be added at constant rate to the column. Understanding of mass transfer during such process is important for design purposes because proper design will allow correct separation and extraction of components. The concentration of components being transferred changes as it flows through the column. As a result, the concentration driving force changes along the height of the column. In the present paper we aim to model a gas absorption process after performing a mass balance along the column and determining the interface composition (mole fraction) and height of a packed tower.
Highlights
Gas absorption is an operation of mass transfer that consists in the separation of components of a gaseous mixture by contact with a suitable fluid
In which a solute diffuses through a vapor phase and later is absorbed in an immiscible fluid phase, like in the absorption of ammonia from air using water
Both phases remain in contact and a concentration gradient is generated in each phase, which allows the mass transfer process
Summary
Gas absorption is an operation of mass transfer that consists in the separation of components of a gaseous mixture by contact with a suitable fluid. Understanding of gas adsorption process is important in fluid stream analysis, study of hydrodynamic features of a packed column, determination of fluids mass balance [2], calculation of parameters such as mass transfer coefficients, design of plate absorption towers, drag and flooding flows calculation, study of physicchemical properties and composition of fluids, component recovery contained in fluid streams, industrial design, process simulation, evaluation of the influence of parameters (i.e. diameter of column, packing height, mass transfer coefficient, molar flow rates, number of trays) [3], process design, countercurrent two-phase flow studies [4], determination of operation line and equilibrium line, optimum stream ratio (inert liquid and gas), effective packing surface area, influence of packing type, evaluation of column efficiency for fractionators, absorbers and strippers [5]. We aim to study this type of system and determine the tower height using kky′y aa
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