Air from a solvent plant contains 2% n-pentane. The pentane concentration is to

Question

Air from a solvent plant contains 2% n-pentane. The pentane concentration is to be reduced to 0.1% by contacting with 6, 950 lbs/hr of oil which contains 0.05% pentane by weight. The air feed rate is 100,000 ft 3/h. The equilibrium relation for pentane in the air-oil system is y = 0.07. The oil molecular weight is 220. How many theoretical plates are required in the gas absorption column? Determine the minimum oil rate required. Rather than purchasing a new column the boss suggests that an existing column be used. This column has 3 theoretical stages. What exit air pentane concentration do you expect for this column for the conditions given in Part A. Your boss suggests that the existing column can do the job if the oil flow rate is increased. Is the boss correct? What oil flowrate is required?

Explanation / Answer

The requirment of theoretical plates are 7.

The minimum required oil rate is 711lbs/hour.

Yes the boss is correct .

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