How much CO2 is required to neutralize caustic?
How much CO2 is required to neutralize caustic?
(OP)
I'm looking at designing a CO2 effluent treatment system for a microbrewery, and I need to make some preliminary calculations to see if the system is feasible.
This may seem a silly question but:
How much CO2 is required to neutralize say, a pound of caustic? (CO2 becomes carbonic acid, which is a polyprotic acid, so there are multiple dissociation constants) I am trying to get a ballpark number without doing a titration.
What about alkalinities? Will that affect my calculations?
CO2 is in the gas phase (supplied from a tank), so how do I take into account the gas liquid efficiencies of the reaction?
Any help is appreciated. Thanks!
This may seem a silly question but:
How much CO2 is required to neutralize say, a pound of caustic? (CO2 becomes carbonic acid, which is a polyprotic acid, so there are multiple dissociation constants) I am trying to get a ballpark number without doing a titration.
What about alkalinities? Will that affect my calculations?
CO2 is in the gas phase (supplied from a tank), so how do I take into account the gas liquid efficiencies of the reaction?
Any help is appreciated. Thanks!





RE: How much CO2 is required to neutralize caustic?
The dissolved CO2 species is a function of pH. Geochemistry, groundwater and pollution by Appelo and Postma (1996), p.94, shows that HCO3- is the predominant species for the pH range 6.5-10, so I suggest that the neutralization reaction is:
Na+ + OH- + HCO3- + H+ = NaHCO3 + H2O
Hence, 44 grams of CO2 will neutralize 40 grams of NaOH.
RE: How much CO2 is required to neutralize caustic?
RE: How much CO2 is required to neutralize caustic?
Hope this helps.
saxon