Regeneration of the Solvent, Desorption

Absorption is favored at raised pressure and low temperature. Therefore, the reverse process, desorption, favors low pressure and high temperature. With desorption the absorbed component is removed from the absorbent the solvent is degassed and regenerated before reuse. On the whole, desorption is carried out in four ways, which can either be applied individually or in combination  

Some regeneration processes for loaded solvent are shown in Fig. 3-29. 

Another example for the separation of an absorbed component from the washing liquid (regeneration) is given in Fig. 3-30. In the presented Wellmann Lord process, sulfur dioxide is separated from flue gas using 

Bubble column [3.48-3.53], vessel absorber Bubble columns without liquid circulation  

Columns with gas distributor (porous sintered plate, perforated plate, sieve tray, spigots, nozzles), gas flows cocurrently or counter-currently through a continous liquid phase in form of bubbles or gas jets homogenous (quasi-laminar) bubble flow, is characterized by a large interfacial area and little backmixing with equal bubbles at a superficial gas velocity Wg 0.05 m/s. Bubble coalescence to form larger bubble, bubble splits, heterogenous (turbulent) bubble flow may be observed at Wg 0.05 m/s. = 1 m/s gas load- 

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