Abstract
In this research, the significant environmental process of CO2 capture is investigated into an aqueous blended MDEA + TMS solution using a stirrer reactor experimentally and numerically. The experiments were designed based on the response surface methodology (RSM) under operating conditions of a pressure range of 2–8 bar, a temperature range of 20–70 °C, MDEA, and TMS concentration range of 10–20 wt%. The results indicated that by enhancing the initial pressure from 3.5 to 8 bar, the equilibrium CO2 loading increases by 17.8%. Based on RSM and central composite design method, the maximum values of CO2 loading and absorption percentages were 0.308% and 72.73%, respectively, at appropriate conditions of the temperature of 32.5 °C, the pressure of 3.5 bar, and MDEA and TMS concentrations of 12.5 wt%. A new relation for CO2 loading was correlated with a correlation coefficient of 0.994, as a function of studied independent variables.
Article Highlights
-
The environmental issue of CO2 absorption into an aqueous blended MDEA+TMS solution is studied.
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The CO2 loading and absorption rate are maximized under optimal operating conditions.
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A new correlation for CO2 loading is modeled as a function of independent variables based on RSM method.
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Equilibrium CO2 loading was predicted by solving VLE, chemical equilibrium constant, mass and charge balance equations.
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Effects of temperature on species concentrations in liquid bulk were presented.
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Abbreviations
- P :
-
Pressure (bar)
- T :
-
Temperature (K)
- R :
-
Universal gas constant
- G :
-
Gibbs energy
- A ϕ :
-
Debye–Huckel parameter
- a, b, c, d, e, f :
-
Constants
- n :
-
Number of moles
- m :
-
Molality (mol kg−1)
- Mw:
-
Molecular weight
- ν :
-
Stoichiometric coefficient
- v :
-
Volume fraction (%)
- w :
-
Weight fraction (%)
- K :
-
Chemical equilibrium constant
- H :
-
Henry’s constant (MPa kg mol−1)
- Bo:
-
Boltzman constant (J K−1) = 1.38065 × 10–23
- B :
-
Second virial coefficient
- I :
-
Ionic strength
- N A :
-
Avogadro's number (mol−1) = 6.02205 × 1023
- e :
-
Electron charge (C) = 1.6021910–19
- z :
-
Charge of ion
- D :
-
Dielectric constant
- ρ :
-
Density (g mL−1)
- α CO2 :
-
CO2 loading
- α H2O :
-
Water activity
- β :
-
Binary interaction parameters
- τ :
-
Tertiary interaction parameters
- γ :
-
Activity coefficient
- ε :
-
Permittivity (C N−1 m−2) = 8.854187 × 10–12
- i, j, k :
-
Numerators
- i0:
-
Initial
- mix:
-
Mixture
- C:
-
Critical
- eq:
-
Equilibrium
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Behroozi, A.H., Akbarzad, N. & Ghaemi, A. CO2 Reactive Absorption into an Aqueous Blended MDEA and TMS Solution: Experimental and Modeling. Int J Environ Res 14, 347–363 (2020). https://doi.org/10.1007/s41742-020-00261-6
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DOI: https://doi.org/10.1007/s41742-020-00261-6