DMSO, dimethyl sulfoxide, is more selective than water in favouring SO
2 over CO
2. A free Pdf called "Dimethyl Sulfoxide (DMSO) Solubility Data" tells 574g/kg and 0.5g/kg at RT. It's also less volatile than water, with bp=+189°C.
Though, it dissolves SO
2 by a reaction, as water does. Health code is 1, flammability 2, and it lets perceive a bad odour.
http://en.wikipedia.org/wiki/Dimethyl_sulfoxideDid you check
sulfuric acid to dissolve SO
2? Provided it's acceptable for your use.
With some solvents, you won't desire a fog to exit your machine. You might consider
rotating disks to put the gas and the solvent in contact, a usual construction resembling the sketch there
http://www.chemicalforums.com/index.php?topic=56452.0despite it is to serve different purposes in that other discussion.
The
multistep dissolution suggested on Nov 17 applies to any solvent.