The dynamics of a packed gas absorber by the pulse response technique

Abstract

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

Nonlinear model predictive control of a packed distillation column

“…This section outlines the unsteady-state packed column models proposed in the literature. Gray and Prados (1963) and Sakata and Prados (1972) investigated the dynamic response of a packed absorber using the frequency response technique and pulse testing, respectively. The model predictions were compared to experimental measurements for the air-water-carbon dioxide system in a 0.1524-m-i.d.…”

Dynamic modelling of countercurrent mass transfer processes

“…If the plates have weir overflow then the Francis equation is applicable Ln « hwn .. (12). and the liquid crest height over the weir hwn is related to plate holdup Ln =,fw(Mm)~ ... (13) Therefore, for a single stage with variable flows the compon-~+~)=~~+~_t-(~+GJ... (15). dt In the majority of gas/liquid or vapour/liquid contactors the liquid holdup is large in comparison to the gas holdup (an exception here is columns operating near (thermodynamic) critical conditions).…”