Q1. A simple rectifying column consists of a tube arranged vertically and supplied at the bottom...

 

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Q1. A simple rectifying column consists of a tube arranged vertically and supplied at the bottom with a mixture of benzene and toluene as vapor. At the top a condenser returns some of the product as a reflux which flows in a thin film down the inner wall of the tube. The tube is insulated and heat losses can be neglected. At one point in the column the vapor contains 70 mol% benzene and the adjacent liquid reflux contains 59 mol% benzene. The temperature at this point is 365 K. Assuming the diffusional resistance to vapor transfer to be equivalent to the diffusional resistance of a stagnant vapor layer 0.2 mm thick, calculate the rate of interchange of benzene and toluene between vapor and liquid. The molar latent heats of the two materials can be taken as equal. The vapor pressure of toluene at 365 K is 54.0 kN/m and the diffusivity of the vapors is 0.051 cm/s. Q1. A simple rectifying column consists of a tube arranged vertically and supplied at the bottom with a mixture of benzene and toluene as vapor. At the top a condenser returns some of the product as a reflux which flows in a thin film down the inner wall of the tube. The tube is insulated and heat losses can be neglected. At one point in the column the vapor contains 70 mol% benzene and the adjacent liquid reflux contains 59 mol% benzene. The temperature at this point is 365 K. Assuming the diffusional resistance to vapor transfer to be equivalent to the diffusional resistance of a stagnant vapor layer 0.2 mm thick, calculate the rate of interchange of benzene and toluene between vapor and liquid. The molar latent heats of the two materials can be taken as equal. The vapor pressure of toluene at 365 K is 54.0 kN/m and the diffusivity of the vapors is 0.051 cm/s.

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To calculate the rate of interchange of benzene and toluene between vapor and liquid in the rectifying column we can use Ficks first law of diffusion Ficks law states that the rate of mass transfer is ... View the full answer