CPE214   Separation Processes 1   (10 credits)

Description

The unit provides a background in mass transfer beginning with molecular diffusion in gases, liquids, and solids. The kinetic theory of gases is discussed as an underpinning theory for the mobility of gases. Links are made here to other transport phenomena, i.e. momentum and heat. Students are introduced to the idea of the driving force rooted in chemical potential. The unit also covers the prediction of diffusivities for liquids and gases. Convective mass transfer is also covered and the mass transfer coefficient is introduced. Correlations and their role in predicting mass transfer coefficients are introduced. Dimensional analysis is used to illustrate the pertinent dimensionless groups in mass transfer. This then leads to the analysis of mass transfer over various systems such as single spheres and flat plates, as well as packed beds and channels. The principles for both continuous and stage-wise separation equipment are introduced, as underpinned by equilibrium, with special focus on absorption. Students are introduced to the operating line and graphical analysis to find exit concentrations. Relationship between equilibrium and mass transfer is discussed. Finally the module covers the sizing of packed towers to consolidate mass transfer principles, equilibrium and mass balances.

Reading List