Design of Packed Column (3q Sy2010-11)

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   ALVIN R. CAPARANGA, PH.D. SCHOOL OF CHEMICAL ENGINEERING AND CHEMISTRY MAPUA INSTITUTE OF TECHNOLOGY  ABSORPTION / STRIPPING   Absorption  Contacting phases: GAS and LIQUID  Solute A or several solutes are absorbed from the gas phase into a liquid phase.   with or without chemical reaction  Mechanism: molecular and turbulent diffusion of A   through a stagnant non-diffusing gas B into a stagnant liquid C.  3   ABSORPTION is a unit operation where concentrations of some components in the gas phase are reduced by absorbing them to the liquid phase.   ABSORPTION is an operation where mass transfer occurs between gas and liquid phase.  Examples:  removal of a noxious component from the gas phase  removal of CO 2  from flue gas or other waste gas steams  removal of H 2 S from natural gas  manufacture of sulfuric acid: absorption of SO 3  in water or dil. H 2 SO 4  or oleum  manufacture of ammonia (absorption of NH 3  in water)   Desorption or Stripping  Reverse of absorption (i.e., mass transfer: L   G)  (Same) theories and principles of absorption apply  Example:  Stripping of volatile components of nonvolatile oils using steam
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