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CO2 absorption into potassium hydroxide aqueous solution: experimental and modeling

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Abstract

In this work, the CO2 absorption by potassium hydroxide aqueous solution was studied. The response surface methodology (RSM) based on central composite design (CCD) was used to design experiments, make models, and find the optimum operating conditions for attaining desirable responses in the range of temperature, pressure and absorbent concentration of 25–65 °C, 2–10 bar and 0.01–1.21 mol/lit, respectively. The effects of process variables and their interactions on the responses were investigated with the numerical model, obtained from experimental data fitting to a second-order polynomial model, to achieve the optimal conditions. The experiments and numerical model indicated that the increase in temperature and absorbent concentration decrease CO2 loading, and an increase in pressure increase CO2 loading. Optimum conditions were found to be the temperature of 35 °C, pressures of 4 bar and, KOH concentration of 0.412 mol/lit. The CO2 loading of 0.745 and CO2 removal efficiency of 32.221% were achieved in the optimal conditions. The modified Pitzer’s GE model was used for CO2 + KOH + H2O system, in order to investigate the species concentration in the liquid phase. The average relative error between predicted CO2 loading and experimental CO2 loading was 7.4%.

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Notes

  1. Monoethanolamine.

  2. Piperazine.

  3. Ethylenediamine.

  4. Methyl diethanolamine.

  5. Diethanolamine.

  6. Electrolyte Non-Random Two-Liquid Model.

Abbreviations

\({{R}}_{{{CO}}_{2}}\) :

CO2 removal efficiency (%)

Pi :

Initial Pressure Pa

Pf :

Final Pressure Pa

Vg :

Volume of gas cm3

T:

Temperature K

C:

Absorbent concentration (mol)

P:

Pressure (bar, Pa)

R:

Universal gas constant (cm3Pa/K.mol)

KR :

Equilibrium constant for the chemical reaction R, expressed on the molality scale (-)

\({{H}}_{{{CO}}_{2},{{H}}_{2}{O}}\) :

Henry’s constant for the solubility of carbon dioxide in pure water (Pa.kg/mol)

\({{V}}_{{{CO}}_{2},{{H}}_{2}{O}}^{\infty }\) :

Partial molar volumes of CO2 dissolved at infinite dilution in water (cm3/mol)

\({{P}}_{i}^{{sat}}\) :

Saturated vapor pressure of component I (Pa)

TC :

Critical temperature (K)

PC :

Critical pressure (Pa)

\({{B}}_{{i},{j}}\) :

Second virial coefficients between species i and j (cm3/mol)

GE :

Excess Gibs free energy (J)

\({{M}}_{{{H}}_{2}{O}}\) :

Molar mass of water (kg/mol0029

I:

Ionic strength (kmol/m3)

\({{A}}_{\varnothing}\) :

Debye-Hueckel parameter (-)

Cϕ :

Third Virial coefficient in Pitzer’s model (Pa)

C:

Absorbent concentration (mol/lit)

\({V}_{{H}_{2}O}\) :

Partial molar volume (cm3/mol)

Z:

Compressibility factor (-)

ni :

Mole number of component I (mol)

\({m}_{i}\) :

Molality of component i in the solution (mol/kg)

\({m}_{i}^{0}\) :

Initial molality of component i in the solution (mol/kg)

\({{y}}_{{i}}\) :

Mole fraction of component i in the gas phase (-)

zi :

Charge of ion I (-)

\({{\alpha }}_{{{CO}}_{2}}\) :

CO2 loading (-)

\({\varphi }_{i}^{v}\) :

Fugacity coefficients of of component i in the gas phase (-)

\({\alpha }_{{H}_{2}O}\) :

Activity of water (-)

γi :

Activity coefficient of component i (-)

\({\beta }_{i,j}^{\left(0\right)}, {\beta }_{i,j}^{\left(1\right)}\) :

Binary interaction parameters between species i and j in Pitzer's equation (-)

\({\uptau }_{{ijk}}\) :

Ternary interaction parameter in Pitzer's equation (-)

g:

Gas (-)

C:

Critical (-)

R:

Reaction R (-)

∞:

Infinite dilution in pure water (-)

sat:

Saturation (-)

\(v\) :

Gas phase (-)

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  1. School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology, P.O. Box 16765-163, Tehran, Iran

    Zahra Rastegar & Ahad Ghaemi

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  1. Zahra Rastegar
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  2. Ahad Ghaemi
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Correspondence to Ahad Ghaemi.

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Rastegar, Z., Ghaemi, A. CO2 absorption into potassium hydroxide aqueous solution: experimental and modeling. Heat Mass Transfer 58, 365–381 (2022). https://doi.org/10.1007/s00231-021-03115-9

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