2 A Column Of Activated Carbon Particles Used For The Adsorption Of A Waste Stream Of Alcohol Vapour In Air Has The Fol 1 (29.28 KiB) Viewed 21 times
2 A Column Of Activated Carbon Particles Used For The Adsorption Of A Waste Stream Of Alcohol Vapour In Air Has The Fol 2 (26.18 KiB) Viewed 21 times
2 A Column Of Activated Carbon Particles Used For The Adsorption Of A Waste Stream Of Alcohol Vapour In Air Has The Fol 3 (34.39 KiB) Viewed 21 times
2. A column of activated carbon particles used for the adsorption of a waste stream of alcohol vapour in air has the following characteristics: Diameter = 4 cm Break-point time, tb = 3.6 h Total capacity, t₁=5.2 h Length of unused bed, HUNB = 4.1 cm Length of bed used up to break point, HB = 9.9 cm Flow rate of inlet gas stream into the column = 754 cm³/s (a) The break-point time for a new column is to be 8.5 h. Calculate the new total length of the column required, column diameter and the fraction of total capacity used up to the break point. The flow rate is to remain constant at 754 cm³/s. (b) Calculate the new diameter of the column if the flow rate is to be increased to 2000 cm³/s.
Numerically, 4,-(1-0) = dt If it is assumed that the breakthrough curve is symmetrical at c/c = 0.5 and t₂, t₁ = ts The usable capacity of the bed up to the break point time to (represented by the crosshatched area) is tu C -1 (1-0) Co = dt t
For a total bed length of H₁, H, is the length of the bed used up to the break point tu HT HB = t₁ The length of unused bed, HUNB, represents the mass transfer zone and can be found by the unused fraction multiplied by the total length of the column Huns - 1-5 H₂ HUNB = The total length of the column is then H₁ = HUNB + H₂0 HB
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