Regeneration of SO₂-Loaded Sodium Phosphate Solution in Rotating Packed Bed

Abstract

The desorption of SO₂ from sodium phosphate buffer solution was investigated using a laboratory-scale rotating packed bed (RPB). The effects of operating parameters such as the high-gravity factor (β) of the RPB, gas–liquid ratio (G/L), sodium phosphate concentration (C_L), preheating temperature (t), and pH of SO₂-rich solutions on the desorption efficiency (θ) of SO₂ were investigated. The experimental results showed that all factors except C_L have significant effects on θ, and θ decreases with increasing rich solution pH and C_L, but increases with increasing β, G/L, and t. Under the optimal conditions of β=60–80, pH≤5, G/L≈800 m³/m³, C_L<2 mol/L, and t≈90°C, θ can exceed 90%. The obtained results imply great potential for RPB use in SO₂-loaded solution desorption.