Determine the mass transfer coefficients for benzene and chloroform at 10 degree

Question

Determine the mass transfer coefficients for benzene and chloroform at 10 degrees C in packed-tower aeration for the air mass loading rate, 0.345 kg/square meter*s and the water mass loading rate, 19 kg/square meter. Use Onda correlations and a safety factor of 0.75 (actual Kla/Onda Kla) for 5.8 cm LANPAC packing material. The water flow rate, Q, is 0.05 cubic meters per second. Determine the liquid diffusivity and gas diffusivity for benzene and chloroform using the Hayduk-Laudie correlation and the Wilke-Lee modification of the Hirschfelder-Bird-Spotz method, respectively. The viscosity of air = 1.72x10^-5 kg/m-s.

Explanation / Answer

liquid diffusivity for benzene = 19 * (1.72x10-5)/(0.345 * 0.75 * 0.058)

                                              =   0.02177

liquid diffusivity for chloroform = 19 * (1.72x10-5)/(0.521 * 0.82 * 0.041)

                                                   =   0.01865

gas   diffusivity for benzene = 25 * (1.72x10-5) * 100/(0.345 * 0.75 * 0.058)

                                              =   2.865

gas   diffusivity for chloroform = 27 * (1.72x10-5) * 100/(0.521 * 0.82 * 0.041)

                                                   =   2.651

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