It is prepared by dissolving sodium tungstate and disodium hydrogen phosphate in water, adding concentrated hydrochloric acid and concentrating to crystallize.
Using tungstic acid and sodium dihydrogen phosphate as raw materials, heteropolysodium phosphotungstate with Dawson structure was synthesized by hydrothermal method. Using P_2W_(18) as the catalyst, absolute ethanol as the co-catalyst, and 30% hydrogen peroxide aqueous solution as the oxidant, the thiophene in the simulated fuel oil was oxidized to sulfones under mild conditions: sulfoxides, etc. have strong polarity The substance was extracted with N,N-dimethylformamide as the extractant, and the effects of reaction temperature, reaction time, amount of aqueous hydrogen peroxide solution, amount of extractant and extraction stages on the desulfurization rate were investigated.
In simulated fuel oil (sulfur content 500 mg/L) 20 mL, P_2W_(18) 0.030 g, absolute ethanol 1.2 mL, hydrogen peroxide aqueous solution 0.12 mL, reaction temperature 310 K, reaction time 60 min, extraction agent and oil phase Under the optimal conditions of volume ratio 1.0 and extraction 3 times, the desulfurization rate reached 96.7%. After the reaction is over, the simulated fuel oil can be separated from the catalyst by simple pouring, and the catalyst can be reused 5 times with good stability.
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