Which of the following is a suitable absorbent for removal of H2S from natural gas ?

Related Mcqs:

1. H2S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5 x. The bulk concentration of H2S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in meters) corresponding to an operating line given by, y = 5x + 0.001 is ______________________?

   A. 2.0
   B. 1.56
   C. 1.0
   D. 0.56

2. Low viscosity absorbent is preferred for reasons of ____________________?

   A. Rapid absorption rates and good heat transfer characteristics
   B. Improved flooding characteristics
   C. Low pressure drop on pumping
   D. All A., B. and C.

3. H2S present in naphtha reformed gas is removed by absorbing with___________________?

   A. Ethanolamine
   B. K2CO3
   C. HCl
   D. Vacuum gas oil

4. For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG: mass transfer co-efficient, moles/m2, a: interfacial area per unit volume of tower) ?

   A. G/(FG . a)
   B. FG/(G . a)
   C. (G . a)/FG
   D. L/(FG . G)

5. With increase in the liquid flow rate at a fixed gas velocity in a randomly packed counter current gas-liquid absorption column, the gas pressure drop___________________?

   A. Decreases
   B. Remains unchanged
   C. Increases
   D. Decreases exponentially

6. The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m2/m3)_________________?

   A. 500
   B. 1200
   C. 900
   D. 800

7. The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m2/m3) ?

   A. 500
   B. 1200
   C. 900
   D. 800

8. Out of the following gas-liquid contacting devices, for a given set of operating conditions, gas pressure drop is the least in ______________ tower?

   A. Wetted wall
   B. Bubble cap
   C. Perforated tray
   D. Packed

9. Mechanism of moisture removal in case of freeze drying of food stuff is by ___________________?

   A. Evaporation
   B. Sublimation
   C. Dehydration
   D. Adsorption

10. Deaeration (removal of O2) of water is done by_________________?

    A. Rectification
    B. Absorption
    C. Ion-exchange
    D. Adsorption