Reaction rate of caustic with CO2

[MT47]

HI

I am going to design a caustic wash tower in ehtylene plant.Is there any one help me to find kenetic formula of the reaction between CO2 and NAOH.

Thank you

 

[m777182]

A similar question has been asked on the forum a few times.
m777182

 

[25362]

For the second-order reaction in aqueous solution:

CO₂ + OH^- [→] HCO₃^-​

I found in the literature the Arrhenius equation:

ln k = ln A - E_a/RT​

where:
A = 1.5[×]10¹⁰ L/(mol.s)
E_a = 38 kJ/mol
R = 8.314[×]10^-3 kJ/(mol.K)
T = temperature, K

From the equilibrium reactions I infer that at pH~8.5 the dominant ion would be the bicarbonate, at high pH values carbonate predominates, at pH~10.5 carbonate and bicarbonate would have about equal concentrations.

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thread469-53556, thread605-6961, thread798-135819.