Abstract
The gas-phase mass transfer coefficient is one of the significant parameter for the determination of mass transfer in absorption columns. A novel correlation was obtained for the calculation of the gas phase mass transfer coefficient in the current research study based on the theoretical investigation and experimental data. Buckingham pi-theorem was utilized to develop an overall dimensionless correlation. The correlation was derived based on the experimental data conducted at the operating conditions’ range of temperature 40–100 °C, CO2 partial pressure of 18-66 kPa, and piperazine (PZ) concentration of 2-8 M. The correlation was validated using the experimental data with an acceptable error of 7.47%. The results showed that the gas-phase mass transfer coefficient was increased by enhancing the amount of holdup and Schmidt number (Sc) at different temperatures and PZ concentrations. Furthermore, by comparing the Sc number with holdup, it was observed that a higher temperature resulted in a higher hold-up amount in the gas-phase of the absorption column.
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Abbreviations
- a e :
-
effective specific interfacial area, 1/m
- a p :
-
packing specific surface area, m
- a t :
-
Total area packing, m
- C G :
-
gas concentration, kmol.m−3
- D G :
-
gas diffusivity,m2/s
- d c :
-
column internal diameter, m
- d eq :
-
equivalent diameter of flow channel, m
- d h :
-
hydraulic diameter of packing, m
- d pe :
-
diameter of a packing element, m
- f :
-
fraction of cells occupied
- f c :
-
fraction of cells occupied at percolation threshold
- G :
-
molar gas flow, mol.s−1
- g:
-
gravitational constant, m.s−2
- HETP:
-
height equivalent to a theoretical plate, m
- HTU:
-
height of mass-transfer unit, m
- h L :
-
liquid holdup, m3.m−3
- K G :
-
gas phase mass-transfer coefficient, m.s−1
- K L :
-
liquid-side mass-transfer coefficient, m.s−1
- K V :
-
density-corrected superficial vapor velocity, m.s−1
- m, n :
-
packing-related constants
- PZ:
-
piperazine
- R :
-
gas constant, J.K−1.mol−1
- S :
-
corrugation side length, m
- T :
-
Temperature, K
- u G :
-
superficial gas velocity, m.s−1
- u L :
-
superficial liquid velocity, m.s−1
- Z t :
-
total height of packed bed, m
- Sh :
-
Sherwood number
- Sc :
-
Schmidt number
- ε :
-
void fraction of packing, m3.m−3
- λ :
-
strip** factor
- Γ:
-
liquid flow based on perimeter, kg.m−1.s−1
- ρ :
-
density, kg/m3
- μ G :
-
gas viscosity, kg.m−1.s−1
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The authors gratefully acknowledge the support from the Research Council of the Iran University of Science and Technology.
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Ghaemi, A., Hemmati, A. Mass transfer coefficient for PZ + CO2 + H2O system in a packed column. Heat Mass Transfer 57, 283–297 (2021). https://doi.org/10.1007/s00231-020-02955-1
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DOI: https://doi.org/10.1007/s00231-020-02955-1