Abstract: A NO2-N2O4 system is employed to remove sulfur in clean coal with a particle size of about 6 mm.First,a certain weight of coal has reacted with a certain volume of NO2-N2O4 system for several minutes,then NO2 escapes from coal in several hours and finally the oxidized coal is washed by water,and sampled.The test results show that both the increasing liquid-solid ratio and prolonging oxidation time are favorable for removal of sulfur and ash,but the particle size of desulfurized coal reduces but the weight and volatile matter increase,and coal loses its caking property.The desulfurization mechanism is surmised as that N2O4 diffuses into coal pores more easily and oxidizes coal.Some of N2O4 decompose thermally into NO2,which escapes from coal with oxidation products.However,the oxidation by NO2-N2O4 system is not selective.
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WU Wei, LIU Jin-fang, SONG Xuan, PENG Yin. A coal desulfurization study by NO2-N2O4 system. Modern Chemical Industry, 2020, 40(S1): 195-199.
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