Hi Folks,
Can I pick your brain on an absorption emissions scenario?
I am running a model using an amine based solvent to capture CO2 from a flue gas in a contactor (absorber), however, about 600 ppm of solvent is been carried over with the treated flue gas exiting the contactor. To recover this, I added a two water wash columns down stream of the contactor overhead and with this I was able to reduce the solvent carry over to ~100 ppm and ~40 ppm at the outlet of the two water washes respectively. This client requirement is to get the solvent carry over down to <1.5 ppm and the one way I know to achieve this is to add an acid wash downstream of the 2nd water wash but with this, I can remove the 40 ppm solvent carryover but this would be unrecoverable which will add up and result to about ~35% solvent makeup per annum. This is huge and not economically competitive so I am looking for other ways to reduce the solvent carryover or loss to about 2 - 5 ppm.
Kindly share your experiences on how I might achieve this.
Thanks folks,
TeeEng.