How to increase the purity of CO2 from lime furnace stack

[rezaeb]

I'm working in a sodaash plant using solvay process. in order to supply CO2 as feedstock, lime furnace is used. CO2 content in the flue gas is about 20%-25%. Due to some operational problems this amount of purity have to be increased to min. 50%. Is there anybody who can tell me, how? Taking into account the presence of oxygen, nitrogen and water vapor in flue gas.

 

[RPG]

Their are membrane systems that will selectiviely pass CO2. You would have to knockout the water and compress the off gas first. Permea makes a membrane that will work.

 

[rezaeb]

Dear PRG
I'd like to appreciate your kind advise, but what I'm seeking is a conventional absorption-regeneration process using a selective absorbant. The reason is at the moment we
have two idle towers with a duty of absorption-stripping CO2. However, they may need to be revamped. I've heard that Mitsubishi Heavy Industries (MHI) has licensed such this process.