Mass transfer coefficient for PZ + CO 2 + H 2 O system in a packed column
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ORIGINAL
Mass transfer coefficient for PZ + CO2 + H2O system in a packed column Ahad Ghaemi 1 & Alireza Hemmati 1 Received: 9 May 2020 / Accepted: 31 August 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
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. Keywords Gas-phase mass transfer coefficient . Buckingham pi-theorem . Piperazine . CO2 . Absorption column
Nomenclature effective specific interfacial area, 1/m ae ap packing specific surface area, m at Total area packing, m CG gas concentration, kmol.m−3 DG gas diffusivity,m2/s dc column internal diameter, m deq equivalent diameter of flow channel, m dh hydraulic diameter of packing, m dpe diameter of a packing element, m f fraction of cells occupied fc 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 hL liquid holdup, m3.m−3 KG gas phase mass-transfer coefficient, m.s−1 KL liquid-side mass-transfer coefficient, m.s−1
* Alireza Hemmati [email protected] 1
School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology, Narmak, Tehran, Iran
KV m, n PZ R S T uG uL Zt
density-corrected superficial vapor velocity, m.s−1 packing-related constants piperazine gas constant, J.K−1.mol−1 corrugation side length, m Temperature, K superficial gas velocity, m.s−1 superficial liquid velocity, m.s−1 total height of packed bed, m
Dimensionless number Sh Sherwood number Sc Schmidt number Greek letters ε void fraction of packing, m3.m−3 λ stripping factor Γ liquid flow based on perimeter, kg.m−1.s−1 ρ density, kg/m3 μG gas viscosity, kg.m−1.s−1
1 Introduction Greenhouse gases producing from human activities are causing the harmful CO2 emissions into the atmosphere that it
Heat Mass Transfer
would have negative impacts on the human communities. One of the important sources of this type of pollutant is fossil fuels such as coal and gas used in power plants and ot
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