The CANSOLV Integrated SO₂–CO₂ System enables SO₂ and CO₂ to be absorbed from the feed gas by counter-current contact with the regenerable amine solvent in the absorption tower. Since the CANSOLV Absorbent DS is extremely selective for SO₂; SO₂ is absorbed first. The regenerable solvent is fed to the top of the SO₂ absorption segment and as it flows down the tower it selectively reacts with SO₂ in the feed gas to form an amine-sulfite. The gas goes on to contact the CO2 Absorbent to achieve maximum loading of the CO₂ into the regenerable solvent.

At the bottom of the absorption tower, the amine that is rich in SO₂ is pumped to a regeneration tower where it is heated to reverse the absorption reaction. As the CANSOLV Absorbent DS moves down the regeneration tower, it is gradually stripped of SO₂. The lean amine from the bottom of the regeneration tower is returned to the absorption tower for additional absorption. The same process occurs at the middle for the amine rich in CO₂. Sensible heat from both lean amines is used to heat incoming rich amines to maximize heat recovery.

The amount of heat added in the regeneration step will determine the extent to which the CANSOLV absorbent will be stripped of SO₂ or CO₂ in the regeneration tower. Both the CO₂ and SO₂ stripped from the CANSOLV absorbents in the regeneration tower are cooled in overhead condensers and are available at positive pressure for utilization.

Cansolv Integrated Absorption at a glance:
SO2 removal to 99% or 10 ppmv CO2 removal to 95% Low effluent Durable solvents stand up to oxidative environment Best-in-class heat consumption for regenerable scrubbing. Can be designed for high turndown or for wide fluctuations in pollutant concentrations No ammonia, no catalysts No solids / slurries