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In this work, hydrodynamic and mass transfer of  CO 2absorption into metal oxide nanofluid includes  TiO 2 , ZnO , and  ZrO 2nanoparticles at Piperazine ( Pz ) solution in the bubble column was studied. The novel rigorous correlations were extended based on the variable parameters for the calculation of gas holdup, enhancement factor, and mass transfer coefficients in the reactive absorption processes using the π-Buckingham method. The correlations were constructed based on dimensionless numbers, including nanoparticle loading, film parameter,  CO 2partial pressure ratio to the total pressure, the film thickness of phases,  CO 2loading, and ratio of diffusion coefficients of  CO 2in the gas and liquid phases. Experimental data were used to calculate the correlations, consisting of  Pz  concentration,  CO 2partial pressure, nanoparticle loading, and stirrer speed in the range of 0.1–0.5 mol/l, 16.0–35.2 kPa, 0.0–0.1 wt%, and 0–300 rpm, respectively. The film parameter was applied to exert the influence of chemical reactions on the performance of absorption. The mean squared error (R MSEP ), the average absolute error ( %AARD ), and the coefficient of correlation of the results ( R 2) for the correlations were in the range 0.021–2.604, 3.78–18.14, and 0.861–0.980, respectively, which represents the excellent accuracy of the proposed correlation.

Hydrodynamic and mass transfer parameters for CO2 absorption into amine solutions and its blend with nano heavy metal oxides using a bubble column