Physical sulfur dioxide absorption

Bronchoconstriction caused by acute exposures to ozone or sulfur dioxide may be expected to change the ventilation distribution, local aerodynamics, and tissue dosage. Edema resulting from exposures to toxic gases may alter the gas-absorptive capacity of the airways, in addition to the aerodynamics. Reaction of irritant gases with surfactant material in the alveoli may alter the absorptive capacity and physical prop-... 

ClausMaster A physical absorption system for capturing residual sulfur dioxide from the Claus process. Developed by Monsanto, now MECS (Monsanto Enviro-Chem Systems). 

Cox, R. A., 1972 Quantum yields for the photooxidation of sulfur dioxide in the first allowed absorption region. J. Physical Chem. 76, 814-820. 

The absorption system can be physically separated from the regeneration system if there are space limitations within the plant. Gases from more than one unit can be treated by installing separate absorbers for each sulfur dioxide source, with all the absorbers being supplied by a common regeneration system. 

The physics and physical chemistry of processes (a), (c) and (e) are relatively well understood, but the effect of the micro-structure of the lime layer on (b) and (d) is complex and depends in part on the characteristics of the limestone. Further complications arise when changes occur in the structure of the surface layers of the lime, caused by sintering, slagging and absorption of sulfur dioxide. 

There are essentially three types of practical processes for removing hydrogen sulhde from gas streams sorption on a solid reversible chemical or physical absorption in a Uquid medium and absorption and oxidation in an oxidizir liquid medium (direct conversion). In the direct converaon processes, not only is hydrogen sulfide removed from the sour gas stream, but it is also converted into elemental sulfur in the same liquid medium. There are two methods by w ich this conversion can be achieved. One is the so-called Wet Qaus process, in which sulfur dioxide is introduced and reacts with the hydrogen sulfide according to the following equation ... 

This reaction maximizes the hydrogen content of the synthesis gas, which consists primarily of hydrogen and carbon dioxide at this stage. The synthesis gas is then scrubbed of particulate matter and sulfur is removed via physical absorption (Chapter 23). The carbon dioxide is captured by physical absorption or a membrane and either vented or sequestered. 

---