Absorption column design process control

The process control scheme for the absorption column is presented in Figure 9.6. It was designed from the recommendations presented in the HAZOP analysis, the results of which are reported in Section 9.8. It features ratio control on the make-up water stream. The signals from flow transmitters on this line and on the gas input line are fed to the ratio controller, whereby the make-up water stream is adjusted. 

Today the main process application for bubble cap trays is in reactive distillation columns or in chemical absorption columns in either case, it may be necessary to control very carefully the residence time of the liquid to complete a reaction step. For example, bubble-cap trays are used for the methyl acetate column described earlier and published by Agreda et al. An abridged version of the Bolles treatment of bubble-cap tray design is given in the fifth edition of Perry s handbook." ... 

For further design and optimization of absorption units with countercurrent flow and solvent regeneration, see [3.4, 3.25-3.30]. The calculations for adiabatic operated absorbers, in which large heat effects have to be considered, are described in [3.31]. Process control of absorption columns can be found in [3.32]. The dynamic behavior of absorption tray columns is discussed in [3.33]. 

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