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picture1_Liquid Liquid Extraction Slideshare 68425 | Muclecture 2022 1832366


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File: Liquid Liquid Extraction Slideshare 68425 | Muclecture 2022 1832366
definition of mass transfer q2 define mass transfer the transference of a component in a mixture from a region where its concentration is high to a region where the concentration ...

icon picture PPTX Filetype Power Point PPTX | Posted on 28 Aug 2022 | 3 years ago
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          Definition of Mass Transfer
      Q2. Define Mass Transfer?
      The transference of a component in a mixture from a region where its 
      concentration is high to a region where the concentration is lower.
      Q2. Where do Mass transfer can occur?
      • Ans. Mass transfer process can take place in a gas or vapour or in a liquid.
      Q3. What are the types of mass transfer?
      Ans. it can result from the random velocities of the molecules (molecular 
      diffusion) or from the circulating or eddy currents present in a turbulent fluid 
      (eddy diffusion).
       Properties difference used for Mass 
                    Transfer
      • fractional distillation depends on differences in volatility, 
      • gas absorption on differences in solubility of the gases in a 
       selective absorbent 
      • and, similarly, liquid- liquid extraction is based on on the 
       selectivity of an immiscible liquid solvent for one of the 
       constituents. 
           Mass Transfer Rate
     The rate at which the process takes place is dependent 
     both on:
     1. the driving force (concentration difference) 
     2. on the mass transfer resistance
                  Note
     Where a chemical reaction takes place during the course of 
     the mass transfer process, the overall transfer rate depends 
     on both the chemical kinetics of the reaction and on the 
     mass transfer resistance, and it is important to understand 
     the relative significance of these two factors in any practical 
     application
                                    Ficks Law
           •  N =-D dC/dy
                A    AB 
           where NA is the molar flux of A (moles per unit area per unit 
           time), 
           CA is the concentration of A (moles of A per unit volume), 
           DAB is known as the diffusivity or diffusion coefficient for A in B, 
           and y is distance in the direction of transfer. 
           An equation of exactly the same form may be written for B: 
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...Definition of mass transfer q define the transference a component in mixture from region where its concentration is high to lower do can occur ans process take place gas or vapour liquid what are types it result random velocities molecules molecular diffusion circulating eddy currents present turbulent fluid properties difference used for fractional distillation depends on differences volatility absorption solubility gases selective absorbent and similarly extraction based selectivity an immiscible solvent one constituents rate at which takes dependent both driving force resistance note chemical reaction during course overall kinetics important understand relative significance these two factors any practical application ficks law n d dc dy ab na molar flux moles per unit area time ca volume dab known as diffusivity coefficient b y distance direction equation exactly same form may be written...

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