10-11-10_notes

_notes - Multiphase Systems • Almost all chemical processes involve material being transferred from one phase to another • Phase-change oper

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Unformatted text preview: 1/27/11 Multiphase Systems • Almost all chemical processes involve material being transferred from one phase to another • Phase-change oper ations – freezing, melting, evaporation,condensation • Seper ation and pur ification separate components of mixtures • Often A and B are fed into a system 1/27/11 Multiphase Separation • Example – brewing a cup of coffee – hot liquid water and solid coffee beans are contacted • Soluble portions of the coffee beans transfer from solid phase to liquid solution • Residual solids are removed by filtr ation 1/27/11 Other separation terms • Absor ption or Scr ubbing removal of undesirable portions of a product gas perhaps through contact with a liquid • Distillation – separating two liquids based on a difference in vapor pressure • Liquid extr action separates liquids based on differences in solubility 1/27/11 Separation • Satur ated – when a species transfers from one phase to another and the new phase is holding as much of the species as it can • Transfer rates of species to their new phase generally slow as saturation approaches • Phase equillibr ium concentrations 1/27/11 Phase Diagrams • At most temperatures and pressures, a single pure substance exists as either a solid, liquid, or a gas- that is a single phase • At a few specific T and P, the substance can exist as two or even three phases simultaneously • Phase diagr am plot one system 1/27/11 SLE LVE SVE 1/27/11...
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This note was uploaded on 01/26/2011 for the course CHE 2171 taught by Professor Wetzel during the Spring '08 term at LSU.

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_notes - Multiphase Systems • Almost all chemical processes involve material being transferred from one phase to another • Phase-change oper

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