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ADSORPTION
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1)1. Adsorption of a pure gas A on activated carbon follows the Langmuir isotherm- Q= 6.4*p /(1+1.53*p), p in kPa and q in mmol/g. If the molecular weight of A is 65, what is the maximum quantity of gas (in kg adsorbate per kg carbon) that can be adsorbed? 
  

2)2. Adsorbents of a small particle size are preferred for liquid separation compared to gas separation because – 
  

3)3. The entropy change for adsorption is 
  

4)4. An adsorption process is 
  

5)5. Which of the following orientations of an adsorption vessel provides a satisfactory flow distribution of the feed? 
  

6)6. A sample of activated alumina may have pores as small as 5 nm. What should be the minimum mercury pressure to ensure filling up these pores in a mercury porosimeter? 
  

7)7. How is the breakthrough concentration defined for adsorption in a packed bed? 
  

8)8. The length of the unused bed is more if the mass transfer zone is: 
  

9)9. A packed bed has a bulk density of 510 kg/m3, and the particles have a density of 770 kg/m3. The bed porosity is: 
  

10)10. What is the major use of carbon molecular sieve (CMS)? 
  

11)11. Adsorption capacity of a regenerated bed compared to the fresh bed is generally 
  

12)12. How does the depth of mass transfer zone change with increasing selectivity coefficient KAB for mono-monovalent ion exchange? 
  

13)13. If the adsorption rate of the solute is infinitely fast and irreversible, the thickness of the Mass Transfer Zone would be 
  

14)14. If the mass transfer resistance is very small, the breakthrough line is: 
  

15)15. If the saturated zone of a bed expands at a rate u` (m/h) and the stoichiometric front moves at a constant velocity us (m/h), then 
  


  


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