[metallurgy]

In an industrial SO2 filter (https://backend.orbit.dtu.dk/ws/portalfiles/portal/6226780/Stig.pdf) most probably this reaction occurs:

2NaHCO3 + SO2 + 1/2 O2 Na2SO4 + 2CO2 + H2O
(https://www.tandfonline.com/doi/pdf/10.1080/00022470.1984.10465793)

And this above reaction generates lots of sodium sulphate as a waste material.

So, is there any way to reverse engineering can be done?  Can we react sodium sulphate with some material and produce NaHCo3 again and inject the system ? Can this be automate in an industrial level like recirculation of the method? (Like generating sodium sulphate then converting into nahco3 and then sodium sulphate again... )

[chenbeier]

If you add calciumhydrogencarbonate. Gypsum will be formed and you have it back.

Na₂SO₄ + Ca(HCO₃)₂ => CaSO₄ + 2 NaHCO₃

[metallurgy]

If you add calciumhydrogencarbonate. Gypsum will be formed and you have it back.

Na₂SO₄ + Ca(HCO₃)₂ => CaSO₄ + 2 NaHCO₃

Okay, is this can be applied industrial level (large scale) ?

[chenbeier]

Why not.  But you also can absorb the SO₂ directly on calciumcarbonate. No sodium(hydrogen)carbonate necessary.

[metallurgy]

Why not. 

Ok, so what kind of equipment, machinery and process is that?

maybe this:

??

But you also can absorb the SO₂ directly on calciumcarbonate. No sodium(hydrogen)carbonate necessary.

Yes but the filter system (MEROS) designed to use Sodiumbicarbonate by default, i don't think that can be variable, or they use it because it absorbs 90%.. So we must think what can we do with its sodium sulphate waste...

[chenbeier]

This is the solvay process to make sodiumcarbonate from sodiumchloride basically. Nothing to do with Sulphurdioxide.

https://en.wikipedia.org/wiki/Solvay_process

[metallurgy]

This is the solvay process to make sodiumcarbonate from sodiumchloride basically. Nothing to do with Sulphurdioxide.

https://en.wikipedia.org/wiki/Solvay_process

No i meant: can we use solvay process to produce sodiumbicarbonate from Na2SO4 + Ca(HCO3)2 ?
The Na2SO4 generating by the filter as a waste. So we may add Ca(HCO3)2 into it and for an industrial scale , we may use solvay process for doing this?

[chenbeier]

Probably, but a problem would be at step 7, what will happen there? Convert that diagramm from NaCl to Na₂SO₄, what other chemicals will go arround, what are the soloubilities in comparison of the existing process?