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

Inactive Publication Date: 2015-02-04
朱忠良
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the current methods for capturing sulfur dioxide by using ionic liquids, although the physical absorption method is easy to desorb, the absorption capacity under reduced pressure is too small; while the chemical absorption method has a large absorption capacity, but the stability is not good and the cycle performance is poor.

Method used

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Examples

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Effect test

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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Abstract

The invention discloses a method for purifying blast furnace flue gas by using ionic liquid. The high-stability ionic liquid is taken as an absorbent for absorbing pollutants in the flue gas, wherein the absorption pressure is 0.05-0.14MPa, the absorption temperature is 20-80 DEG C, and the absorption time is 4-6 hours; and pollutants in the absorbed flue gas are subjected to desorption operation at 140-160 DEG C. A preparation method of the ionic liquid comprises the following steps: refluxing and stirring equimolar 1-(2-phenethyl) imidazole hydriodate and iodine ethyl diethyl phosphate with methanol as a solvent at 120 DEG C for 48 hours; after reaction is ended, cooling to room temperature, and carrying out spin steaming to remove a solvent so as to obtain viscous liquid; dissolving the liquid into water; adding equimolar sodium hydroxide, stirring at room temperature for 2 hours, and carrying out spin steaming to remove water; and filtering out solid sodium iodide, and drying in vacuum so as to obtain the ionic liquid of 1-(2-phenethyl)-3-(2-diethyl phosphite ester) ethyl imidazole iodine. According to the method, the denitration efficiency can be over 95%, the desulphurization efficiency can be over 98%, the mercury removal efficiency is over 90%, the dechlorination and defluorination efficiency is over 95%, oxidative degradation of partial volatile organic pollutants is achieved, and increasingly stringent environmental requirements in future can be met.

Description

technical field [0001] The invention relates to a method for purifying blast furnace flue gas by using ionic liquid. Background technique [0002] With the rapid development of economy and society and the improvement of people's living standards, the flue gas emitted by coal combustion has deteriorated the atmospheric environment, and the harm of acid rain has increased, which has seriously affected human survival and the ecological environment. The removal of pollutants in flue gas has caused domestic and foreign widespread attention. How to develop efficient, reversible, and low-cost new technologies for removing pollutants from flue gas is a hot issue of common concern worldwide. The sulfur oxides and nitrogen oxides produced in the process of energy utilization have caused increasingly serious harm to my country's atmospheric environment. In addition, trace amounts of heavy metals such as mercury Hg, HCl, HF and volatile organic pollutants VOC have also increasingly cau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14C07F9/6506
Inventor 朱忠良
Owner 朱忠良
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