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Method for adsorbing hydrogen fluoride and hydrogen chloride by using SBA-15 adsorbent

A technology of hydrogen fluoride and hydrogen chloride, which is applied in the direction of chemical instruments and methods, separation methods, and separation of dispersed particles, can solve the problems of serious flying powder, large consumption of lime powder, and low removal efficiency, and achieves simple operation and simple equipment structure , good removal effect

Pending Publication Date: 2022-08-02
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for adsorbing hydrogen fluoride and hydrogen chloride by using SBA-15 adsorbent to solve the problems of large consumption of lime powder, serious flying powder and low removal efficiency in the prior art

Method used

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  • Method for adsorbing hydrogen fluoride and hydrogen chloride by using SBA-15 adsorbent
  • Method for adsorbing hydrogen fluoride and hydrogen chloride by using SBA-15 adsorbent
  • Method for adsorbing hydrogen fluoride and hydrogen chloride by using SBA-15 adsorbent

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Experimental program
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Effect test

Embodiment 1

[0026] Pulverize SBA-15 to obtain 40-60 mesh SBA-15 particles, and load the SBA-15 particles on the surface of kaolin packing by roasting technology. and hydrogen chloride gas (the industrial waste gas containing hydrogen fluoride and hydrogen chloride obtained from a copper smelter, the concentrations of HF and HCl are 135ppm and 164ppm respectively), nitrogen is introduced into the packed tower, and the gas flow rate is 100mol / min, and the absorption liquid ( 2 mmol / L KOH solution) to absorb unreacted hydrogen fluoride and hydrogen chloride gas to obtain the adsorption curves of hydrogen fluoride and hydrogen chloride such as figure 1 , figure 2 shown.

[0027] Depend on figure 1 It can be seen that SBA-15 has a very good removal effect on fluoride ions. It penetrates in about 350min (the absorption efficiency reaches below 90%), and the removal rate of hydrogen fluoride can reach 99%.

[0028] Depend on figure 2 It can be seen that the removal effect of chloride ions ...

Embodiment 2

[0033] Pulverize SBA-15 to obtain 40-60 mesh SBA-15 particles, and load the SBA-15 particles on the surface of high-pressure graphite packing by roasting technology. Removal of hydrogen fluoride and hydrogen chloride gas (industrial waste gas containing hydrogen fluoride and hydrogen chloride obtained from a waste incineration plant, the concentrations of HF and HCl are 123ppm and 147ppm respectively), nitrogen gas is introduced into the packed tower, and the gas flow rate is 100mol / min, and reused The absorption liquid (2 mmol / L KOH solution) absorbs unreacted hydrogen fluoride and hydrogen chloride gas, that is, the adsorption of hydrogen fluoride and hydrogen chloride is completed.

Embodiment 3

[0035] Pulverize SBA-15 to obtain 40-60 mesh SBA-15 particles, and load the SBA-15 particles on the surface of borax filler by roasting technology. and hydrogen chloride gas (industrial waste gas containing hydrogen fluoride and hydrogen chloride obtained from a power plant, the concentrations of HF and HCl are 148ppm and 172ppm respectively), nitrogen is introduced into the packed tower, and the gas flow rate is 100mol / min, and the absorption liquid (2mmol / min) is reused. / L KOH solution) to absorb unreacted hydrogen fluoride and hydrogen chloride gas, that is, to complete the adsorption of hydrogen fluoride and hydrogen chloride.

[0036]The removal rate of each embodiment to hydrogen fluoride and hydrogen chloride is shown in Table 2, and the treatment cost comparison is shown in Table 3 (conventional treatment method is specifically: the lime powder is directly injected into the flue and reacts with the acid gas in the flue to generate solid products, so that it is removed....

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Abstract

The invention discloses a method for adsorbing hydrogen fluoride and hydrogen chloride by using an SBA-15 adsorbent, and belongs to the technical field of dry deacidification of waste gas. The method comprises the following steps: crushing SBA-15 to obtain SBA-15 particulate matters, loading the SBA-15 particulate matters on the surface of a filler by adopting a roasting technology, putting the filler into a filler tower to remove hydrogen fluoride and hydrogen chloride gas, and absorbing unreacted hydrogen fluoride and hydrogen chloride gas by utilizing an absorption liquid to finish adsorption of hydrogen fluoride and hydrogen chloride. According to the method for adsorbing the hydrogen fluoride and the hydrogen chloride by fixing the SBA-15 adsorbent on the surface of the filler through a high-temperature filler roasting technology, a good removal effect on the hydrogen fluoride and the hydrogen chloride is achieved, and flying powder is not generated. The adsorption method is simple in equipment structure and simple and convenient to operate, can be widely applied to removal of hydrogen fluoride and hydrogen chloride in various gas sources, and has a very good application prospect.

Description

technical field [0001] The invention belongs to the technical field of dry deacidification waste gas, in particular to a method for adsorbing hydrogen fluoride and hydrogen chloride by using SBA-15 adsorbent. Background technique [0002] Hydrogen fluoride (Hydrogen fluoride-HF) is a colorless, pungent odor toxic gas with very strong hygroscopicity. It produces white smoke upon contact with air, and is easily soluble in water. The main source of HF in the atmosphere is the emission of industrial waste gas. For example, in the production process of aluminum using electrolysis in the aluminum manufacturing industry, a large amount of gases such as hydrofluoric acid and silicon tetrafluoride and dusts such as aluminum fluoride and calcium fluoride will be generated. And the harm of hydrogen fluoride to human body is twenty times that of sulfur dioxide, when the content of fluoride in the air exceeds 1mg / m 3 It will cause direct harm to human eyes, skin and respiratory organs....

Claims

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Application Information

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IPC IPC(8): B01D53/04B01D53/68B01D53/78
CPCB01D53/04B01D53/78B01D53/68B01D2253/108B01D2257/2045B01D2257/2047B01D2251/306B01D2251/604
Inventor 张芷桐李凯郝星光孙鑫王驰宁平王飞马懿星
Owner KUNMING UNIV OF SCI & TECH
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