Chromium is an important industrial raw material. As far as China is concerned, chromium is in great demand, which is dependent on imports and large emissions. So recovery of chromium has important economic and environmental protection value. The extraction and back extraction of Cr(III) from solution by the extractant diisooctyl phosphate (di‐2‐ethylhexylphosphoric acid [D2EHPA]) with n‐octanol as assistant and sulphonated kerosene as diluent was studied. The effects of saponification rate, phase ratio, temperature, condensation of extract, aging of extractant, and pH of aqueous phase on extraction equilibrium were discussed, and the formulation of extractant was optimized. The coordination number of the extraction reaction under specific conditions was discussed by the saturation capacity method. The extraction reaction kinetics were mathematically characterized by binary linear regression. The advantages and disadvantages of back extraction with H2SO4 or NaOH were compared. At last, a process to realize the recycling of extractant was obtained.
In order to achieve efficient micron-scale water-in-oil emulsion separation, a facile and effective strategy is developed to prepare a super-hydrophobic/super-oleophilic fiberglass filter membrane (FGm).
To explore the ignition performance of the ramjet combustion chamber, this paper combined the specific structure and working principle of the ramjet to model the ramjet combustion chamber, and carried out numerical simulation research on the flow field characteristics and combustion process of the stable operation of the combustion chamber. The results show that for the blunt-body of the flame stabilizer, the overall flame stability zone is relatively large at low inlet velocity, but the strength of the return zone at low inlet velocity is smaller than that at high speed. The flame stability zone formed at high inlet velocity is more stable and has stronger resistance to external disturbance. When the ratio of oil and gas mixtures is in the flammability limit range, the selection of ignition position has an important influence on the success of ignition. When the high-temperature zone formed by the initial ignition core can be diffused into the reflux zone and maintain sufficient temperature, the ignition can be successful.
In order to investigate the influence of plasma combustion on the performance of aeroengine combustor, a local geometric model of the two-head sector section of the short combustor was established. The steady-state numerical calculation of the kerosene in the combustor was carried out under the conventional mechanism and the specific operating condition under the plasma mechanism. The numerical calculation results of the combustor with or without the plasma mechanism were compared and analyzed. The results show that the average temperature, flow field velocity, density and turbulent kinetic energy behind the cyclone in the two-head fan section of the combustion chamber are better than those under the conventional mechanism, which indicates that the application of plasma mechanism can significantly improve the combustion performance of the combustion chamber to a certain extent. Under the chemical proper ratio, the average temperature of the outlet section of the combustion chamber increases from 1910K to 2050K, and the combustion efficiency increases from 82.4% to 90.1% by 7.7%, indicating that the addition of plasma mechanism can deepen the chemical reaction degree of kerosene and release more heat to improve the combustion efficiency of kerosene.
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