چكيده به لاتين
Upgrading of hydrocarbon products presents the most important challenges for the refining industry. Considering the constraints on available resources, market demand and environmental restrictions, this necessity requires sustainable technologies. In the present research, design and fabrication of an experimental setup was conducted to evaluate the efficacy of hydrodynamic cavitation process for desulfurization of liquid fuels. Hydrodynamic cavitation signal processing was presented for characterization of the phenomena. The signals amplitude plots as well as spectrogram graph and Fast Fourier Transform (FFT) were used for the characterization purposes at various conditions. Dominant frequency analysis and Mean square of the signals could be regarded as a quantitative index for cavitation overall intensity. To evaluate the performance of hydrodynamic cavitation in advanced oxidation processes, Emerging combination of that with a dual oxidant chemical system (HC-KPS-H2O2), was used for decolorization of Coomassie Brilliant Blue (CBB) in wastewater. Investigations were conducted via experimental design using Box-Behnken Design (BBD). A remarkable 92% decolorization in 60 min was attained at HC inlet pressure, H2O2 concentration and KPS concentration equal to 7.1 bar, 676.1 mg L-1 and 541.1 mg L-1, respectively. Synergistic coefficient of 3.04 was obtained using the combined process. The Hydrodynamic Cavitation Assisted Oxidative Desulfurization (HCAOD) process was applied for treatment of diesel fuel feedstock using hydrogen peroxide and formic acid as the oxidant and catalyst, respectively. Investigation on the effect of main process variables including pressure drop (3-6 bar), time of treatment (10-30 min) and formic acid to oxidant molar ratio (nA/nO) (1–5), was performed through Box-Behnken design. A remarkable 91% extent of desulfurization at optimum condition with HC pressure drop of 4.2 bar, acid to oxidant ratio (nA/nO) of 3.2 in 29 min was achieved. The results were also compared to an oxidation system without the aid of hydrodynamic cavitation. Eventually, Experimental studies on diesel sulfur desulfurization using water-diesel system at organic to water phase ratio of 0.25, inlet pressure of 4bar reactor resulted in 68% desulfurization using the reactor equipped with a multi-hole orifice.
