R z uT uz = radius of cell, ft = distance from the cake surface, f t =horizontal component of stress, lb/ft' = vertical component of stress, Ib,/ft2 LITERATURE CITED 1. 2. 3. 4. 5. 6. 7. 8.The dynamic response of a packed gas absorber to inlet gas composition changes was investigated by the pulse response technique for the case where absorption was accompanied by pseudo first-order irreversible chemical reaction.The solute-carrier-solvent system was carbon dioxide-air-0.07 normal aqueous sodium hydroxide solution. The column used was 6.5 in. I.D. Plexiglass packed to a height of 6.15 ft. with either %-in. Raschig rings or %-in. Bed Saddles. Gas flow rates ranged fmm 1.5 to 10 Ib.-moles/ hr./sq.ft. and liquid flow rates ranged from 0 to 200 Ib.-moles/hr./sq.ft. A pulse of carbon

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Use of residence time distributions (RTD's) for the design of clarifiers proposed by the senior author in 1969 and by others has been found to be based on flow pattern assumptions which are false. Since the residence time distribution depends upon the density of the feed to the clarifier, flow rate and other near‐intangibles, it is not possible to obtain RTD's which pertain to an operating settler from which reliable performance may be predicted. Finally, laboratory studies demonstrate that the combination of RTD's and quiescent settling data do not reliably predict clarifier performance.

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