Study On Gas-Agitated Liquid And Reactive Extraction Process For The Preparation Of Hydrogen Peroxide Via Anthraquinone Process

The liquid-liquid extraction, gas-agitated extraction and the integrated process between the oxidation of the hydrogenated working solution and the extraction of hydrogen peroxide from oxidized working solution were studied. The reactive extraction process involves simultaneous oxidation 2-ethylhydroanthraquionone and liquid-liquid separation. Oxygen was introduced with the hydrogenated work solution through a nozzle in the bottom of the column, the oxygen worked as agitated air as well as reactant.In the gas-agitated liquid-liquid extraction column ((50), deionized water and working solution were the continuous phase and the dispersed phase respectively, and the two phases countercurrent passed through the sieve plate of the column with a flow ratio of 1:50, which is consistent with the industrial processes. The effects of the superficial velocity of air, dispersed phase and continuous phase on overall plate extraction efficiency, the holdups of dispersed and gas phase had been investigated, respectively. Air was injected into the column to increase turbulence, enhance liquid droplet dispersion and surface renewal, and enlarge mass transfer area, which leads to the overall plate efficiency (ET), holdup of dispersed and gas phase increasing and the concentrations of hydrogen peroxide in the raffinate decreasing with increasing gas phase superficial velocity. The correlation formulas of overall plate extraction efficiency and the holdups of dispersed and gas phase in three-phase system were described by the gas, dispersed phase superficial velocity.The mass-transfer of the integrated process has been investigated in the semi-batch reactor. The effects of the stir rates, tempreture and hydrogenated extent on consumption of oxygen and hydrogen peroxide concentration in the aqueous were studied. The mass-transfer equations on the interfaces of gas-organic solution and organic solution–aqueous were deduced by:Moreover, the gas-liquid-liquid reactive extraction system for preparing hydrogen peroxide via anthraquinone was also investigated. The results showed that the reaction and extraction efficiency increased with gas injection superficial velocity increasing. The experiment data of 2-ethylhydroanthraquionone, hydrogen peroxide concentrations were compared with the caculated values by stage model. The average relative deviation was less than 10%.Finally, the research results of the integrated process can enhance the oxidation and extraction units of anthraquinone process, which proved the possibility of the industrial application.