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A method for deep removal of sulfur dioxide in mixed gas

A technology of sulfur dioxide and mixed gas, which is applied in the fields of chemical engineering and polymer materials, can solve the problems of reducing separation efficiency and separation selectivity, and achieve the effects of stable performance, good water stability and increased flexibility

Active Publication Date: 2020-12-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these micropores also enhance the interaction with competing components, which leads to a decrease in separation selectivity and lower separation efficiency.

Method used

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  • A method for deep removal of sulfur dioxide in mixed gas
  • A method for deep removal of sulfur dioxide in mixed gas
  • A method for deep removal of sulfur dioxide in mixed gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] 9.42g of 1-vinylimidazole and 7.78g of dibromohexane were mixed and stirred for 20 hours to obtain a white solid, which was dissolved in water, distilled off under reduced pressure at 50°C, and recrystallized three times with ethyl acetate to obtain 1,6-bis(N , N'-vinylimidazolyl) hexane bromide ionic liquid.

[0060] Using 1,6-bis(N,N'-vinylimidazolyl)hexane bromide as a monomer, a highly cross-linked ionic gel was prepared. Dissolve 20g of 1,6-bis(N,N'-vinylimidazolyl)hexane bromide and 60mg of initiator azobisisobutylamidine hydrochloride in 16mL of water. Irradiate under light for 10 minutes, soak in water for two days after solidification, obtain 1,6-bis(N,N'-vinylimidazolyl)hexane bromide salt high cross-linking ion gel, freeze-dry, remove water and grind for use. The product was completely non-porous as measured by a nitrogen adsorption instrument.

[0061] The adsorption isotherm (25 ℃) of sulfur dioxide and other gases of the highly cross-linked ion gel prepa...

Embodiment 2

[0063] Dissolve 9g (4-pyridylmethyl) methacrylate and 13.2g p-dibromobenzyl in 30mL of ethanol, stir and react at 40°C for 24 hours, remove the ethanol by distillation under reduced pressure, and recrystallize ethyl acetate three times to obtain 1,4 - Bis(4-methacrylatepyridyl)benzyl bromide salt. The dried bromide ionic liquid and 1.1 times excess ammonium thiocyanate were ion-exchanged in acetonitrile, and the ionic liquid with thiocyanate as anion could be dissolved in acetonitrile, stirred at room temperature for 24 hours and then filtered to obtain the filtrate, and the acetonitrile was removed by distillation under reduced pressure , After drying, 1,4-bis(4-methacrylic acid methyl pyridyl)benzyl thiocyanate can be obtained.

[0064] Ionic liquid gels were prepared using 1,4-bis(4-methacrylatepyridyl)benzyl thiocyanate as a monomer. Dissolve 14g of 1,4-bis(4-methacrylic acid methyl pyridyl)benzyl thiocyanate and 42mg of initiator azobisisobutylamidine hydrochloride in 11...

Embodiment 3

[0066] Dissolve 9g of dimethylaminopropyl methacrylamide and 15.5g of 1,12-dibromododecane in 30mL of ethanol, stir and react at 40°C for 24 hours, remove the ethanol by distillation under reduced pressure, and recrystallize ethyl acetate three times to obtain 1,12-Bis(methacrylamidopropyldimethylamino)dodecyl bromide salt. Dissolve the dried ionic liquid in water, and slowly pass through the hydroxide-type ion exchange column to exchange anions into hydroxide ions. Acid-base titration determines the concentration of hydroxide ions in the ion-exchanged solution to determine the amount of acetic acid added. Equimolar amounts of acetic acid and oxyhydroxide type ionic liquid undergo acid-base neutralization reaction at normal temperature to obtain ionic liquid with acetic acid as anion. The water generated in the reaction was distilled off under reduced pressure at 50°C, and dried to obtain 1,12-bis(methacrylamidopropyldimethylamino)dodecane acetate.

[0067] Ionic liquid gel ...

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Abstract

The invention discloses a method for advanced removal of sulfide dioxide from mixed gas. Ionic gel with high degree of crosslinking is taken as an adsorbent and makes contact with the mixed gas, and sulfide dioxide is efficiently removed from mixed gas; the ionic gel with high degree of crosslinking has rich ion groups and specific compact polymer network, so that the ionic gel has unique adsorption function on sulfide dioxide, has the advantages of high adsorption capacity, superhigh selectivity and the like and can realize efficient desulfurization of the mixed gas; the ionic gel with high degree of crosslinking is simple, green, rapid to prepare, excellent in thermal stability and water stability and applicable to industrial large-scale production and application. Under the optimizationcondition, the removal rate of sulfide dioxide in the mixed gas is higher than 99%, and the recovery rate of other gases is higher than 99%; the ionic gel with high degree of crosslinking can realizecomplete desorption under the physical adsorption function, the one-time removal efficiency is improved, and long-time circulation use is facilitated.

Description

technical field [0001] The invention relates to the fields of chemical engineering and polymer materials, in particular to an ion gel adsorption desulfurization method. Background technique [0002] With the improvement of people's quality of life, the awareness of environmental protection has gradually increased, and air pollution has attracted increasing attention, especially the severe smog in recent years, which has great harm to people's normal life and health. Sulphide is the main component of PM2.5. The combustion of coal and the emission of vehicle exhaust will all produce sulphide emissions. Moreover, the direct discharge of sulfur dioxide will form acid rain, which will cause serious damage to the ecological environment. Therefore, the desulfurization treatment of flue gas and the desulfurization treatment of clean energy natural gas are very important in industry. [0003] A commonly used desulfurization method is adsorption desulfurization. The Chinese patent ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/02B01J20/22B01J20/28
CPCB01D53/02B01D2253/204B01D2257/302B01J20/226B01J20/28047
Inventor 邢华斌夏伶杨启炜赵宁
Owner ZHEJIANG UNIV
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