Determine the break-point time, the fraction of total capacity used up to the break point, the length of the unused bed, and the saturation loading capacity of the solid.

Drying of Nitrogen and Scale-Up of a Column. Using molecular sieves, water vapor was removed from nitrogen gas in a packed bed (C1) at 28.3°C. The column height was 0.268 m, with the bulk density of the solid bed being equal to 712.8 kg/m3. The initial water concentration in the solid was 0.01 kg water/kg solid and the mass velocity of the nitrogen gas was 4052 kg/m2 · h. The initial water concentration in the gas was co = 926 × 10 –6 kg water/kg nitrogen. The breakthrough data are as follows:

A value of c/co = 0.02 is desired at the break point. Do as follows:

a. Determine the break-point time, the fraction of total capacity used up to the break point, the length of the unused bed, and the saturation loading capacity of the solid.

b. For a proposed column length HT = 0.40 m, calculate the breakpoint time and fraction of total capacity used.

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