Equilibrium distribution of SO/sub 2/ between anion-exchange resins and aqueous solutions
The results are published of a systematic study of SO/sub 2/ adsorption by ion-exchange resins in the presence of moisture. The swelling water in an ion-exchange resin is the medium for transfer of SO/sub 2/ (and of other gases which dissolve in water) from the gas phase to the functional groups of the resin. An external solution of SO/sub 2/ in water is also formed at 100% relative humidity of the gas mixture, and an equilibrium distribution of SO/sub 2/ over the chain of contacting media is established: SO/sub 2/ (gas) ..-->..0 SO/sub 2/ (external solution) ..-->..0 SO/sub 2/ (solution in resin) ..-->..0 SO/sub 2/ (resin runctional groups). If the swollen ion-exchange resin is considered a single phase, then the SO/sub 2/ distribution between it and the water-saturated gas phase may be calculated using data for the individual gas phase-aqueous SO/sub 2/ solution and SO/sub 2/ solution-swollen resin systems. Exhaustive handbook data are available for gas phase-aqueous SO/sub 2/ solution systems. The SO/sub 2/ solution-swollen resin system was studied for a number of resin in the present work. The distribution of SO/sub 2/ between anion-exchange resins in basic forms and aqueous solutons (and the equilibrium gas phase) is described by equations for the neutralization of the resins by sulfurous acid and ion exchange in the system. Anion-exchange resin AV-17 takes up form 1 mole SO/sub 2//g-eq exchange capacity for C/sub SO/sub 2/(g)/ > 1 g/m/sub 3/ to approx.0.5 m/g-eq for C/sub SO/sub 2/(g)/ < 1 mg/m/sup 3/ from the moisture-saturated gas phase. Weekly basic anion-exchange resins (pK/sub B/ > 7) absorb approx.1 mole/g-eq for C/sub SO/sub 2/(g)/ > 50 g/m/sup 3/, but their volume decreases sharply for C/sub SO/sub 2/(g)/ < 10 g/m/sup 3/, and there is virtually no adsorption at C/sub SO/sub 2/(g)/ approx.1 mg/m/sup 3/.
- Research Organization:
- State Scientific-Research Inst. for Nonferrous Metals, USSR
- OSTI ID:
- 5382952
- Journal Information:
- J. Appl. Chem. USSR (Engl. Transl.); (United States), Vol. 55:12; Other Information: Translated from Zh. Prikl. Khim.; 55: No. 12, 2690-2695(Dec 1982)
- Country of Publication:
- United States
- Language:
- English
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