A solid disc of benzoic acid 25 mm in diameter is spinning at 20 rpm (revolutions...

 

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A solid disc of benzoic acid 25 mm in diameter is spinning at 20 rpm (revolutions per minute) at 25 °C. The following data on benzoic acid at 25 °C are available: Diffusivity in water 1.00 x 10 m²/s; Diffusivity in air = 2.33 x 10s m²/s; Solubility in water at = 3.0 kg/m23; Equilibrium vapour pressure 0.30 mm Hg. Other information: Kinematic viscosity of water at 25 °C= 9.0 x 107 m2/s; Kinematic viscosity of air at 25 °C = 1.56 x 10 s m2/s; Molecular mass of benzoic acid = 0.122 kg. %3D Tables of mass transfer correlations for fluid-fluid and fluid-solid interfaces State and justify all assumptions in making the following calculations. a) How fast will it dissolve in a large volume of water? b) How fast will it dissolve in a large volume of air? c) Explain on physical grounds the difference between the results in parts (a) and (b) above. A solid disc of benzoic acid 25 mm in diameter is spinning at 20 rpm (revolutions per minute) at 25 °C. The following data on benzoic acid at 25 °C are available: Diffusivity in water 1.00 x 10 m²/s; Diffusivity in air = 2.33 x 10s m²/s; Solubility in water at = 3.0 kg/m23; Equilibrium vapour pressure 0.30 mm Hg. Other information: Kinematic viscosity of water at 25 °C= 9.0 x 107 m2/s; Kinematic viscosity of air at 25 °C = 1.56 x 10 s m2/s; Molecular mass of benzoic acid = 0.122 kg. %3D Tables of mass transfer correlations for fluid-fluid and fluid-solid interfaces State and justify all assumptions in making the following calculations. a) How fast will it dissolve in a large volume of water? b) How fast will it dissolve in a large volume of air? c) Explain on physical grounds the difference between the results in parts (a) and (b) above.

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