Method for purifying blast furnace flue gas by using ionic liquid
A technology of ionic liquid and flue gas, which is applied in the direction of chemical instruments and methods, organic chemistry, compounds of group 5/15 elements of the periodic table, etc., can solve problems such as poor cycle performance, poor stability, and small absorption capacity
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Embodiment 1
[0016] A method for purifying blast furnace flue gas using ionic liquids, using a highly stable ionic liquid as an absorbent to absorb pollutants in the flue gas, the absorption pressure is 0.08MPa, the absorption temperature is 70°C, and the absorption time is 5 hours; the pollutants in the absorbed flue gas were desorbed at 140° C., and the preparation method of the ionic liquid was as follows: equimolar 1-(2-phenylethyl) imidazole hydroiodide and iodoethyl phosphate diethyl The ester uses methanol as a solvent, reflux and stir at 120°C for 48h, after the reaction is completed, cool to room temperature, and remove the solvent by rotary evaporation to obtain a viscous liquid, dissolve this liquid in water, add equimolar sodium hydroxide, and stir at room temperature for 2h , the water was removed by rotary evaporation, and the solid sodium iodide was filtered off, and vacuum-dried to obtain the ionic liquid 1-(2-phenylethyl)-3-(2-diethoxyphosphinate)ethylimidazolium iodine.
Embodiment 2
[0018] A method for purifying blast furnace flue gas using ionic liquids, using a highly stable ionic liquid as an absorbent to absorb pollutants in the flue gas, the absorption pressure is 0.05MPa, the absorption temperature is 20°C, and the absorption time is 6 hours; the pollutants in the absorbed flue gas were desorbed at 160 ° C, and the preparation method of the ionic liquid was as follows: equimolar 1-(2-phenylethyl) imidazole hydroiodide and diethyl iodoethyl phosphate The ester uses methanol as a solvent, reflux and stir at 120°C for 48h, after the reaction is completed, cool to room temperature, and remove the solvent by rotary evaporation to obtain a viscous liquid, dissolve this liquid in water, add equimolar sodium hydroxide, and stir at room temperature for 2h , the water was removed by rotary evaporation, and the solid sodium iodide was filtered off, and vacuum-dried to obtain the ionic liquid 1-(2-phenylethyl)-3-(2-diethoxyphosphinate)ethylimidazolium iodine.
Embodiment 3
[0020] A method for purifying blast furnace flue gas using ionic liquids, using a highly stable ionic liquid as an absorbent to absorb pollutants in the flue gas, the absorption pressure is 0.12MPa, the absorption temperature is 40°C, and the absorption time is 4 hours; the pollutants in the absorbed flue gas were desorbed at 150° C., and the preparation method of the ionic liquid was as follows: equimolar 1-(2-phenylethyl) imidazole hydroiodide and iodoethyl phosphate diethyl The ester uses methanol as a solvent, reflux and stir at 120°C for 48h, after the reaction is completed, cool to room temperature, and remove the solvent by rotary evaporation to obtain a viscous liquid, dissolve this liquid in water, add equimolar sodium hydroxide, and stir at room temperature for 2h , the water was removed by rotary evaporation, and the solid sodium iodide was filtered off, and vacuum-dried to obtain the ionic liquid 1-(2-phenylethyl)-3-(2-diethoxyphosphinate)ethylimidazolium iodine.
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