Solubility of sulfur dioxide in aqueous sulfuric acid solutions

Abstract

In this paper we describe a relatively simple apparatus for measuring gas solubilities In a corrosive solvent at various gas partial pressures, the main requirements for which are accurate pressure measuring devices. We summarize all the data for sulfur dioxide solubilities in aqueous sulfuric acid solutions available to us and present them In a form suitable for further comparison and possible applications. Finally we add to the data the results of our own work for two temperatures and a range of gas partial pressures for the acid concentration of 97.0 wt %.

New analytical methodology for analysing S(IV) species at low pH solutions by one stage titration method (bichromatometry) with a clear colour change. Could potentially replace the state-of-art-method iodometry at low pH analysis due higher accuracy

“…It is known that the efficient SO 2 dissolution depends on solution pH: the solubility of SO 2 decreases in lean H 2 SO 4 solutions in comparison to pure water [ 6 ] due to the increase amount of protons that suppress the hydrolysis of dissolved SO 2 [ 21 ]. When acid concentration is further increased, the dissolution improves [ 22 ]. Ultimately, the amount of dissolved SO 2 is a function of solution pH.…”

“…Because there is no independent data of the real concentration of the SO 2 in the purged solutions available, two methods are compared with each other: if both methods provided the same value, the point would be at the dashed slope line (Figs 5 and 6 ). In Fig 5 it can be clearly seen that highest SO 2 concentrations are obtained at the highest pH and the amount of dissolved SO 2 decreases with a decrease of pH [ 22 ]. The numerical values obtained with iodometry provides larger values than bichromatometry, eventually due to the side reactions (2) , (3) , (8) , (9) and (10).…”

Gasification of spent alkylation sulfuric acid droplets in hot environments

“…The shape-distortion behaviors could be a result of SO formation in the liquid phase; SO is not highly 2 2 Ž . soluble in sulfuric acid Hayduk et al, 1988 , and could potentially nucleate bubbles at high enough concentrations. Alternatively, light hydrocarbons or water trapped in the droplets could be raised above a nucleation temperature and could form bubbles.…”

“…increases. In addition, Hayduk et al 1988 have published data on SO solubility limits in aqueous sulfuric acid solu-2 tions; these data show that SO solubility limits decrease 2 appreciably as the liquid temperature is increased. It is plausible that spent acid droplets, which are decomposing in a hot environment, may attain conditions where SO produced 2 in the liquid phase sufficiently exceeds solubility limits such that bubbles might form; these bubbles could distort and fragment droplets if the bubbles grow sufficiently rapidly.…”

“…Unfortunately, data have not been found for SO solubility 2 limits in spent acid. However, solubility limit data for SO in 2 Ž aqueous sulfuric acid mixtures has been published Hayduk . et al, 1988 ; the data will be assumed to characterize SO 2 solubility behaviors in spent acid.…”