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How to reproduce NaHCO3 by using Sodium Sulphate?

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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 :rarrow: 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:

--- Quote from: chenbeier on February 04, 2020, 04:00:04 AM ---If you add calciumhydrogencarbonate. Gypsum will be formed and you have it back.

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

--- End quote ---

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:

--- Quote from: chenbeier on February 04, 2020, 05:46:20 AM ---Why not. 
--- End quote ---
Ok, so what kind of equipment, machinery and process is that?

maybe this:

??


--- Quote from: chenbeier on February 04, 2020, 05:46:20 AM ---But you also can absorb the SO2 directly on calciumcarbonate. No sodium(hydrogen)carbonate necessary.
--- End quote ---
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...

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