Nitric oxide absorption by hydrogen peroxide in airlift reactor: a study using response surface methodology

Abstract

Absorption of nitric oxide from nitric oxide /air mixture in hydrogen peroxide solution has been studied on bench scale internal loop airlift reactor. The objective of this investigation was to study the performance of nitric oxide absorption in hydrogen peroxide solution in the airlift reactor and to explore/determine the optimum conditions using response surface methodology. A BoxBehnken model has been employed as an experimental design. The effect of three independent variables-namely nitric oxide gas velocity, 0.02-0.11 m/s; nitric oxide gas concentration, 300-3,000 ppm and hydrogen peroxide concentration, 0.25-2.5 %-has been studied on the absorption of nitric oxide in aqueous hydrogen peroxide in the semi-batch mode of experiments. The optimal conditions for parameters were found to be nitric oxide gas velocity, 0.02 m/s; nitric oxide gas concentration, 2,246 ppm and hydrogen peroxide concentration, 2.1 %. Under these conditions, the experimental nitric oxide absorption efficiency was observed to be *65 %. The proposed model equation using response surface methodology has shown good agreement with the experimental data, with a correlation coefficient (R 2 ) of 0.983. The results showed that optimised conditions could be used for the efficient absorption of nitric oxide in the flue gas emanating from industries.

Effective removal of p-tert-Butylphenol and Pyridine, 3-(1-methyl-2-pyrrolidinyl)-, (S)- from landfill leachate using locust bean gum

“…The high coefficients of determination R 2 of 0.974 and 0.967, respectively, also indicated the adequate ability of the model to represent the actual relationship among the operating variables (Bashir et al, 2010; Naik and Setty, 2014; Subramonian et al, 2015). The predicted R 2 values of 0.844 and 0.809 were in desirable and reasonable agreement with the adjusted R 2 of 0.942 and 0.926, respectively, indicating the aptness of the experimental model within the range of operating variables (Bhanarkar et al, 2014).…”

Photocatalytic degradation of industrial pulp and paper mill effluent using synthesized magnetic Fe 2 O 3 -TiO 2 : Treatment efficiency and characterizations of reused photocatalyst

“…The model had insignificant lack-of-fit values, which supported a strong model correlation between the operating conditions and COD removal. Additionally, R 2 value greater than 0.75 indicates the aptness of the model (Naik and Setty, 2014) and adjusted R 2 indicates the capability of the developed model to satisfactorily describe the system behaviour within the range of operating factors (Bhanarkar et al, 2014). In this study, the quadratic model was well-fitted to the experimental data with high R 2 and adjusted R 2 values (0.9966 and 0.9935, respectively).…”

Production of a biodegradable flocculant from cotton and evaluation of its performance in coagulation-flocculation of kaolin clay suspension: Optimization through response surface methodology (RSM)

“…As can be seen, R 2 value is high (R 2 =0.9955) and reasonably agreed with the adjusted R 2 value of 0.9872. It means that the quadratic model fits the data and satisfactorily describe the system behavior within the range of operating factors [30]. The observed and predicted values by the quadratic model are shown in Table 2.…”