Sodium Carbonate dosing system

Reduce your operation cost

Sodium carbonate is injected in the process water as the reacting agent to remove SOx in the exhaust gas. This applies to both closed-loop and hybrid configurations.

When running in closed-loop mode, the circulation water must be dosed with an alkaline additive. Up to now this has always been the liquid additive Sodium Hydroxide (caustic soda), but in this unit a powder like sodium carbonate can be used instead.

Taken aboard dry and loaded into a silo, the powder is mixed with desalinated water before entering the closed-loop circuit. This cuts operating costs, and reduces the potential onboard hazard.

More information:



SO2 + H2O → H2SO3

 Na2CO3 + H2SO3 → Na2SO3 + CO2 + H2O

 Na2SO3 + ½O2 → Na2SO4


 H2SO3 + ½O2 → H2SO4

 Na2CO3 + H2SO4 → Na2SO4 + CO2 + H2O

 Reduce to

 SO2 + H2O + ½O2 + Na2CO3 → Na2SO4 + CO2 + H2O