Table 8. Effect of Amount of Added H2SO4 on SO2 Absorption and the Claus Reaction in [TMG][Lac] Aqueous Solutiona.
| w (H2SO4) | pHabs | absorption capacity (g SO2/g abs) | RS/% |
|---|---|---|---|
| 0 | 8.20 | 0.120 | 86.1 ± 1.0 |
| 2% | 5.85 | 0.101 | 91.2 ± 1.0 |
| 4% | 5.37 | 0.086 | 91.4 ± 1.1 |
| 6% | 5.00 | 0.074 | 91.2 ± 1.2 |
| 8% | 4.59 | 0.055 | 91.6 ± 1.0 |
| 10% | 4.29 | 0.039 | 91.1 ± 1.1 |
a
The concentration of [TMG][Lac] in aqueous solutions is 60 wt % (w[TMG][Lac] = 60%), the concentration of SO2 is 2 vol %, the temperature of SO2 absorption of is 40 °C, and the temperature of the Claus reaction is 40 °C.