Absorção e Stripping: Processos, Aplicações e Fatores Cruciais

Figure 61 Typical absorption process Larger the absorbent flow rate the larger the A The absorbent flow rate can be reduced by lowering the solute Xvalue Because Xvalues for many solutes vary exponentially with T and inversely to p this reduction can be achieved by already dealing T andor increasing p Increasing p also reduces the diameter of the equipment for a given gas throughput However adjustment of T by refrigeration andor adjustment of p by gas compression increases both capital and operating costs For a stripper the stripping factor S 1A KY L is crucial To reduce the required flow rate of stripping agent operation of the stripper at high T andor low p is desirable with an optimum stripping factor being about 14 For absorption and stripping design procedures are well developed and commercial processes are common Table 61 lists representative applications In most cases the solutes are in gaseous effluents Strict environmental standards have Liquid absorbent 25C 1013 kPa Water 1943 kmolh Argon 0391 N2 14691 O2 53583 Water 220 Acetone 005 1 Exit gas 25C 90 kPa kmolh Argon 469 N2 1461 O2 5360 Water 588 Acetone 103 Feed gas 25C 1013 kPa 30 Exit liquid 25C 1013 kPa kmolh O2 0009 N2 0017 Water 19269 Acetone 1025