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injection of CO2 rich gas in Ca(OH)2 soln


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Hi Tom,

i have a situaton where i'm bubling a CO2 rich gas (attached)in a saturated lime soln to achive final pH of 9.0 (tank open to atmosphere). What is the resulting chemistry at the end of the reaction?


CO2 rich Gas Composition


(mol %)

Hydrogen H2 1.09

Methane CH4 5.42

Carbon monoxide CO 4.86

Nitrogen N2 0.64

Ethylene C2H4 0.55

Ethane C2H6 0.8

Oxygen/Argon O2/Ar 0.28

Propylene C3H6 0.67

Carbon dioxide CO2 84.45

Propane +butene 0.5



pH 12

Ca (mg/L) 209

Mg (mg/L) 0.1

Na (mg/L) 301.5

K (mg/L) 47

NH3-N (mg/L) 7.2

Cl (mg/L) 367

SO4 (mg/L) 177

F (mg/L) 1.6

M-Alkalinity (mg/L as CaCO3) 545

P-Alkalinity  (mg/L as CaCO3) 489

HCO3- (mg/L as CaCO3) 0

CO3-- (mg/L as CaCO3) 115

OH (mg/L as CaCO3) 602

Conductivity (µS/cm) 3411.5

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Hi Mooketsi:


To build this model-


  1. Use the React model
  2. Load your water into the Basis pane
  3. Titrate your gas in via the Reactants pane


For now I would ignore the organic phases, as they will introduce additional complexity that is probably unwarranted at this point. Note that you will need the right basis species representatives for each gas you titrate in. For instance, if you titrate Methane into the model, you'll need to constrain the oxygen component (either dissolved oxygen or Eh) in the Basis. Also, to model gases such as Argon, Carbon Monoxide and some of the organics, you'll want to use the extended Lawrence Livermore thermodynamic database (thermo.com.v8.r6+.dat).


Hope that helps,


Tom Meuzelaar

RockWare, Inc.

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