mass transfer dr auroba (1)

mass transfer dr auroba (1) - University of Technology...

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Unformatted text preview: University of Technology Chemical engineering department Third year Mass Transfer By Dr. Auroba .N.Abdullah 1 Mass Transfer Operations Introduction: What is chemical engineering? Chemical engineering is the field of engineering that deals with industrial processes in which raw materials are converted or separated into final useful products. Who is the chemical Engineer? The function of a qualified chemical engineer is to apply chemistry of a particular industrial process through the use of coordinated scientific and engineering principles. Also develop the laboratory results of chemists into economical chemical plants, he must develop, design and engineer both the complete industrial process and the equipment used in it. Then his duties can be stated as: 1- He must choose the raw material. 2- He must design and operate the plant efficiently, safely, and economically. 3- He must know that his products meet the requirements set by the customers. 4- When science does not give him a complete answer, he must use experience & judgment to combine all sources of information to reach particular solution to processing problems. Definition of Unit Operation:- The physical operations necessary for manufacturing chemicals deals mainly with the transfer and change of material and energy principles by physical means but also by chemical – physical means such as mass transfer, heat transfer and momentum transfer (fluid dynamics). There are two types of unit operation classifications: The first one depends on the process type as: 1- Processes without chemical reaction, as distillation, crystallization, absorption, extraction, and filtration. 2- Processes with chemical reactions as nitration, oxidation, and sulfonation. While the second classification depends on the type of transfer occur within the process such as: 1- Mass transfer operations Transfer of component from one phase to another such processes is: Gas absorption, Distillation, Extraction, Crystallization, Drying, Evaporation, Leaching, Stripping, Mechanical separation for example (Filtration, settling, size reduction, and sedimentation). 2- Heat transfer operations Accumulation and transfer of heat and energy such as: Heat exchanger, Evaporation, Drying, Distillation. 3- Momentum transfer operations Flow and transportation of fluid and solid such as: Fluid flow, Mixing, Handling of solid, Fluid transportation. 2 Chapter Two Mass Transfer & Diffusion Mass transfer is the net movement of a component in a mixture from one location to another location where the component exists at a different concentration. Often, the transfer takes place between two phases across an interface. Thus, the absorption by a liquid of a solute from a gas involves mass transfer of the solute through the gas to the gas-liquid interface, across the interface, and into the liquid. Mass transfer models are used to describe processes such as the passage of a species through a gas to the outer surface of a porous adsorbent particle and into the pores of the adsorbent, where the...
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This note was uploaded on 03/18/2012 for the course ECON 201 taught by Professor Çakmak during the Spring '10 term at Middle East Technical University.

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mass transfer dr auroba (1) - University of Technology...

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