Selective dechlorination absorbent, preparation method and use method

An absorbent and selective technology, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve the problems of no hydrogen chloride selectivity, and the chlorine capacity of dechlorination agents needs to be improved, so as to achieve good dechlorination effect and easy The operation realizes the effect of well-developed pores

Active Publication Date: 2022-03-11
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The dechlorination agent disclosed above can react with other acidic components at the same time, and has no selectivity to hydrogen chloride, and the chlorine capacity of the dechlorination agent needs to be improved

Method used

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  • Selective dechlorination absorbent, preparation method and use method
  • Selective dechlorination absorbent, preparation method and use method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Dissolving sodium bicarbonate, sodium sulfite and sodium oxalate in water to obtain a mixed slurry, the mass content of sodium bicarbonate in the resulting mixed slurry is 20%; the mass content of sodium sulfite is 40%, and the mass content of sodium oxalate is 40%; the addition of water The mass is 10% of the mass of the mixture. Dry the mixed slurry at a temperature of 100°C for 3 hours, pass through a 120-mesh sieve into fine particles, and obtain a selective dechlorination absorbent, that is, a dechlorination agent.

[0051] Take 2 g of the dechlorination agent sample prepared in this example, fill it in a quartz reaction tube with a certain aspect ratio by vibration, place it in a tube furnace, and adjust the temperature to 100°C. Feed SO into the reaction tube 2 Mixed gas with HCl, the total gas volume is 200ml / min, in N 2 Make balance gas, use Fourier transform infrared spectrometer to monitor the concentration of HCl gas in real time, if the amount of HCl cont...

Embodiment 2

[0053] Dissolving sodium bicarbonate, sodium sulfite and sodium oxalate in water to obtain a mixed slurry, the mass content of sodium bicarbonate in the resulting mixed slurry is 10%; the mass content of sodium sulfite is 40%, and the mass content of sodium oxalate is 50%. The mass is 10% of the mass of the mixture. Dry the mixed slurry at a temperature of 120°C for 2 hours; pass through a 120-mesh sieve into fine particles to obtain a selective dechlorination absorbent, that is, a dechlorination agent.

[0054] Take 2 g of the dechlorination agent sample prepared in this example, fill it in a quartz reaction tube with a certain aspect ratio by vibration, place it in a tube furnace, and adjust the temperature to 100°C. Feed SO into the reaction tube 2 Mixed gas with HCl, the total gas volume is 200ml / min, in N 2 Make balance gas, use Fourier transform infrared spectrometer to monitor the concentration of HCl gas in real time, if the amount of HCl contained in the outlet gas ...

Embodiment 3

[0056] Dissolving sodium bicarbonate, sodium sulfite and sodium oxalate in water to obtain a mixed slurry, the mass content of sodium bicarbonate in the resulting mixed slurry is 10%; the mass content of sodium sulfite is 50%, and the mass content of sodium oxalate is 40%. The mass is 10% of the mass of the mixture. Dry the mixed slurry at 110°C for 2 hours, pass through a 120-mesh sieve to form fine particles, and obtain a selective dechlorination absorbent, that is, a dechlorination agent.

[0057] Take 2 g of the dechlorination agent sample prepared in this example, fill it in a quartz reaction tube with a certain aspect ratio by vibration, place it in a tube furnace, and adjust the temperature to 100°C. Feed SO into the reaction tube 2 Mixed gas with HCl, the total gas volume is 200ml / min, in N 2 Make balance gas, use Fourier transform infrared spectrometer to monitor the concentration of HCl gas in real time, if the amount of HCl contained in the outlet gas falls below ...

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Abstract

The invention belongs to the field of flue gas deacidification and material preparation, and discloses a selective dechlorination absorbent, a preparation method and a use method. The absorbent for selective dechlorination comprises sodium bicarbonate, sodium sulfite and sodium oxalate, and the mass ratio of sodium bicarbonate to sodium sulfite to sodium oxalate is (1-2): (3-5): (3-5). The preparation method comprises the following steps: (1) weighing sodium bicarbonate, sodium sulfite and sodium oxalate, uniformly mixing to obtain a mixture, then adding water, and stirring until the mixture is pasty to obtain mixed slurry; (2) standing the mixed slurry in an open air for cooling, and naturally airing; and (3) drying the air-dried mixed slurry, and crushing and sieving the dried mixed slurry to obtain the selective dechlorination absorbent. The absorbent provided by the invention can react with more hydrogen chloride, but does not react with other acidic components, has efficient selectivity on hydrogen chloride, is simple in preparation method and high in chlorine capacity, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of flue gas deacidification and material preparation, and in particular relates to an absorbent for selective dechlorination, a preparation method and a use method. Background technique [0002] Currently, in addition to SO 2 , NOx and other conventional gas pollutants, chlorine pollutants in the sintering flue gas of the iron and steel industry have gradually attracted people's attention. Studies have shown that most of the chlorine in the sintering flue gas is precipitated into the blast furnace in the form of HCl, which will severely corrode the subsequent equipment such as pipes and TRT blades, and affect the life of the blast furnace equipment components. At present, chlorine is generally removed at the same time as desulfurization, but there are many problems. For the wet desulfurization system, most of the chlorine pollutants are trapped in the desulfurization slurry and desulfurization gypsum, which increase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/83B01D53/68
CPCB01D53/83B01D53/685B01D2251/304B01D2257/2045B01D2258/0283
Inventor 邢奕苏伟王艳钱大益王嘉庆张文伯陈靖张晖马梦莹
Owner UNIV OF SCI & TECH BEIJING
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