CN114832578A - Method for adsorbing hydrogen fluoride and hydrogen chloride by SBA-15 adsorbent - Google Patents
Method for adsorbing hydrogen fluoride and hydrogen chloride by SBA-15 adsorbent Download PDFInfo
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- CN114832578A CN114832578A CN202210508680.2A CN202210508680A CN114832578A CN 114832578 A CN114832578 A CN 114832578A CN 202210508680 A CN202210508680 A CN 202210508680A CN 114832578 A CN114832578 A CN 114832578A
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- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 title claims abstract description 70
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 229910000041 hydrogen chloride Inorganic materials 0.000 title claims abstract description 62
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 229910000040 hydrogen fluoride Inorganic materials 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000003463 adsorbent Substances 0.000 title claims abstract description 17
- 239000007789 gas Substances 0.000 claims abstract description 31
- 239000000945 filler Substances 0.000 claims abstract description 24
- 239000002245 particle Substances 0.000 claims abstract description 20
- 238000010521 absorption reaction Methods 0.000 claims abstract description 14
- 238000005516 engineering process Methods 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 238000011068 loading method Methods 0.000 claims abstract description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 239000005995 Aluminium silicate Substances 0.000 claims description 4
- 235000012211 aluminium silicate Nutrition 0.000 claims description 4
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910021538 borax Inorganic materials 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
- 239000004328 sodium tetraborate Substances 0.000 claims description 3
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 3
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 claims description 2
- 238000010298 pulverizing process Methods 0.000 claims 2
- 239000000843 powder Substances 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 8
- 238000001179 sorption measurement Methods 0.000 abstract description 5
- 239000002912 waste gas Substances 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 11
- 239000002440 industrial waste Substances 0.000 description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 4
- 235000011941 Tilia x europaea Nutrition 0.000 description 4
- 230000006378 damage Effects 0.000 description 4
- 239000004571 lime Substances 0.000 description 4
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000012265 solid product Substances 0.000 description 3
- 238000010408 sweeping Methods 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 2
- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 210000004877 mucosa Anatomy 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- IRPGOXJVTQTAAN-UHFFFAOYSA-N 2,2,3,3,3-pentafluoropropanal Chemical compound FC(F)(F)C(F)(F)C=O IRPGOXJVTQTAAN-UHFFFAOYSA-N 0.000 description 1
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminum fluoride Inorganic materials F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
- 206010020565 Hyperaemia Diseases 0.000 description 1
- 206010028851 Necrosis Diseases 0.000 description 1
- 206010030113 Oedema Diseases 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- -1 fluorine ions Chemical class 0.000 description 1
- 238000010335 hydrothermal treatment Methods 0.000 description 1
- 230000002757 inflammatory effect Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000017074 necrotic cell death Effects 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000000241 respiratory effect Effects 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- ABTOQLMXBSRXSM-UHFFFAOYSA-N silicon tetrafluoride Chemical compound F[Si](F)(F)F ABTOQLMXBSRXSM-UHFFFAOYSA-N 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/68—Halogens or halogen compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/306—Alkali metal compounds of potassium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/106—Silica or silicates
- B01D2253/108—Zeolites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/20—Halogens or halogen compounds
- B01D2257/204—Inorganic halogen compounds
- B01D2257/2045—Hydrochloric acid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/20—Halogens or halogen compounds
- B01D2257/204—Inorganic halogen compounds
- B01D2257/2047—Hydrofluoric acid
Abstract
The invention discloses a method for adsorbing hydrogen fluoride and hydrogen chloride by using an SBA-15 adsorbent, belonging to the technical field of dry method deacidification waste gas. The method comprises the steps of crushing SBA-15 to obtain SBA-15 particles, loading the SBA-15 particles on the surface of a filler by adopting a roasting technology, putting the particles into a filler tower to remove hydrogen fluoride and hydrogen chloride gas, and absorbing unreacted hydrogen fluoride and hydrogen chloride gas by using an absorption liquid to complete the absorption of the hydrogen fluoride and the hydrogen chloride. The method for adsorbing hydrogen fluoride and hydrogen chloride by fixing the SBA-15 adsorbent on the surface of the filler through the high-temperature filler roasting technology has a good removal effect on the hydrogen fluoride and the hydrogen chloride, and does not generate flying powder. The adsorption method has simple equipment structure and simple and convenient operation, can be widely used for removing hydrogen fluoride and hydrogen chloride from various gas sources, and has good application prospect.
Description
Technical Field
The invention belongs to the technical field of dry deacidification of waste gas, and particularly relates to a method for adsorbing hydrogen fluoride and hydrogen chloride by using an SBA-15 adsorbent.
Background
Hydrogen fluoride (Hydrogen fluoride-HF) is a colorless, pungent and toxic gas, has very strong hygroscopicity, generates white smoke when contacting air, and is easily dissolved in water. The main source of atmospheric HF is the emission of industrial waste gases. For example, in the aluminum production industry, a large amount of gases such as hydrofluoric acid and silicon tetrafluoride and dusts such as aluminum fluoride and calcium fluoride are generated in the production process of aluminum by the electrolysis method. The harm of hydrogen fluoride to human body is twenty times of that of sulfur dioxide, and when the content of fluoride in air exceeds 1mg/m 3 In time, direct damage can occur to the eyes, skin and respiratory organs of humans. Fluoride produced by the hydrogen fluoride reaction also causes bone damage, tooth weakness, and the like. The corrosion effect on aluminum products is also extremely strong.
Hydrogen chloride (Hydrogen chloride-HCl) is a colorless gas with a choking odor. HCl gas in the atmosphere mainly comes from the aspects of coal combustion and industrial waste gas emission, and acid gases such as HCl and the like can be generated by incomplete combustion of coal. And hydrogen chloride gas is generated in the production process of industries such as paper mills, steel industry, electroplating industry and the like. Most of the hydrogen chloride is retained by the mucosa of the upper respiratory tract after being inhaled, and a part of the hydrogen chloride is neutralized, so that the hydrogen chloride has stimulation and burning effects on local mucosa, causes inflammatory edema, hyperemia and necrosis, can react with various metals to generate hydrogen, and generates hydrogen cyanide which is a virulent agent when encountering cyanide. The combination of atmospheric hydrogen chloride and air water can form the acidic substance hydrochloric acid. Thus aggravating the formation of acid rain which has great harm to plants and buildings.
In general, the methods for removing HF and HCl include wet, dry, semi-dry deacidification, and the like. In the dry method, lime powder is directly sprayed into a flue to react with acid gas in the flue to generate a solid product. Its advantages are: no wastewater is generated (no wastewater treatment equipment is required to be configured), and the operation is simple; the disadvantages are: the lime powder consumption is large, the later flying powder treatment cost is increased, and the removal efficiency is low. However, studies on improvement of the removal efficiency of hydrogen fluoride and hydrogen chloride by using SBA-15 adsorbent have been reported.
Disclosure of Invention
The invention provides a method for adsorbing hydrogen fluoride and hydrogen chloride by using an SBA-15 adsorbent, which aims to solve the problems of high lime powder consumption, serious powder flying, low removal efficiency and the like in the prior art. The method for adsorbing hydrogen fluoride and hydrogen chloride by fixing the SBA-15 adsorbent on the surface of the filler through the high-temperature filler roasting technology has a good removal effect on the hydrogen fluoride and the hydrogen chloride, and does not generate flying powder.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a method for adsorbing hydrogen fluoride and hydrogen chloride by using an SBA-15 adsorbent, which comprises the following steps: the method comprises the steps of crushing SBA-15 to obtain SBA-15 particles, loading the SBA-15 particles on the surface of a filler by adopting a roasting technology, putting the particles into a filler tower to remove hydrogen fluoride and hydrogen chloride gas, and absorbing unreacted hydrogen fluoride and hydrogen chloride gas by using an absorption liquid to complete the absorption of the hydrogen fluoride and the hydrogen chloride.
Furthermore, the crushing is to crush SBA-15 into particles of 40-60 meshes.
Further, the filler is one or more of high-pressure graphite packing, aluminum silicate, borax and kaolin.
In the invention, all the selected fillers have the property of high temperature resistance. Ultrasonic treatment and rotary steaming treatment are also carried out before roasting.
Further, the roasting temperature is 400-500 ℃, and the roasting time is 2-5 hours.
Further, nitrogen is introduced into the packed tower, and the gas flow rate is 50-150 mol/min.
Further, the absorption liquid is 2mmol/L KOH solution.
The invention has the beneficial effects that:
the method for adsorbing hydrogen fluoride and hydrogen chloride by fixing the SBA-15 adsorbent on the surface of the filler through a high-temperature filler roasting technology has a good effect of removing hydrogen fluoride and hydrogen chloride, the removal rate of hydrogen fluoride can reach 99%, the removal rate of hydrogen chloride can reach 96%, and no flying powder is generated. The adsorption method has simple equipment structure and simple and convenient operation, can be widely used for removing hydrogen fluoride and hydrogen chloride from various gas sources, and has good application prospect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is an adsorption curve of example 1 for hydrogen fluoride removal at 15 ℃ and 58% RH;
FIG. 2 is an adsorption curve of example 1 at 15 ℃ and 58% RH for hydrogen chloride removal.
Detailed Description
Reference will now be made in detail to various exemplary embodiments of the invention, the detailed description should not be construed as limiting the invention but as a more detailed description of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Further, for numerical ranges in this disclosure, it is understood that each intervening value, between the upper and lower limit of that range, is also specifically disclosed. Every smaller range between any stated value or intervening value in a stated range and any other stated or intervening value in a stated range is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference herein for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the present disclosure without departing from the scope or spirit of the disclosure. Other embodiments will be apparent to those skilled in the art from consideration of the specification. It is intended that the specification and examples be considered as exemplary only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.
SBA-15 was prepared in all the following examples: soaking P123 in hydrochloric acid solution (the concentration of hydrochloric acid is 2mol/L, the mass ratio of P123 to hydrochloric acid solution is 1:11.76), and stirring at 35 ℃ and the rotation speed of 350r/min until the solution is dissolved to obtain mixed solution; dropping tetraethyl silicate into the mixed solution (the mass ratio of tetraethyl silicate to P123 is 1:0.36, and the dropping speed of tetraethyl silicate is 0.30mL/min), and stirring for 24h to obtain a white suspension; placing the white suspension in a reaction kettle, and carrying out hydrothermal treatment at 100 ℃ for 24 hours; the SBA-15 was obtained by filtration, washing (solution washing to neutrality), drying (in a forced air oven at 100 ℃) and calcination (at 550 ℃ for 5 h).
Example 1
The method comprises the steps of crushing SBA-15 to obtain SBA-15 particles of 40-60 meshes, loading the SBA-15 particles on the surface of a kaolin filler by adopting a roasting technology, wherein the roasting temperature is 400-500 ℃, the roasting time is 5 hours, putting the particles into a packed tower to remove hydrogen fluoride and hydrogen chloride gas (the concentrations of HF and HCl in industrial waste gas containing hydrogen fluoride and hydrogen chloride obtained from a certain copper smelting plant are 135ppm and 164ppm respectively), introducing nitrogen into the packed tower, enabling the gas flow rate to be 100mol/min, and absorbing unreacted hydrogen fluoride and hydrogen chloride gas by using an absorption liquid (2mmol/L KOH solution) to obtain absorption curves of the hydrogen fluoride and the hydrogen chloride, wherein the absorption curves are shown in figures 1 and 2.
As can be seen from FIG. 1, the removal effect of SBA-15 on fluorine ions is good, penetration is carried out for about 350min (the absorption efficiency is less than 90%), and the removal rate on hydrogen fluoride can reach 99%.
As can be seen from FIG. 2, the chlorine ion removal effect is good, penetration is performed for about 50min, and the removal rate of hydrogen chloride can reach 96%.
In the embodiment, SBA-15 particles are loaded on the surface of a kaolin filler by adopting a high-temperature roasting technology (roasting at 400-500 ℃), and compared with low-temperature roasting (roasting at 100-200 ℃), nitrogen with flow rates of 50mol/min, 100mol/min and 150mol/min is respectively used for sweeping the filler loaded with SBA-15, mass changes before and after sweeping are obtained, the mass changes are recorded in table 1, the mass difference of the filler before and after nitrogen sweeping of a high-temperature roasting group is small, and the powder flying of SBA-15 powder can be reduced.
TABLE 1 Mass Difference of fillers before and after nitrogen purging
Example 2
The method comprises the steps of crushing SBA-15 to obtain SBA-15 particles of 40-60 meshes, loading the SBA-15 particles on the surface of a high-pressure graphite packing filler by adopting a roasting technology, roasting at 400-500 ℃ for 5 hours, removing hydrogen fluoride and hydrogen chloride gas (the concentrations of HF and HCl in industrial waste gas containing hydrogen fluoride and hydrogen chloride obtained from a certain garbage incineration plant are 123ppm and 147ppm respectively) in a packed tower, introducing nitrogen into the packed tower at a gas flow rate of 100mol/min, and absorbing unreacted hydrogen fluoride and hydrogen chloride gas by using an absorption liquid (2mmol/L KOH solution), so that the adsorption of the hydrogen fluoride and the hydrogen chloride is completed.
Example 3
The method comprises the steps of crushing SBA-15 to obtain SBA-15 particles of 40-60 meshes, loading the SBA-15 particles on the surface of a borax filler by adopting a roasting technology, roasting at 400-500 ℃ for 5 hours, putting the particles into a packed tower to remove hydrogen fluoride and hydrogen chloride gas (the concentrations of HF and HCl are 148ppm and 172ppm respectively in industrial waste gas containing hydrogen fluoride and hydrogen chloride obtained from a certain power plant), introducing nitrogen into the packed tower at a gas flow rate of 100mol/min, and absorbing unreacted hydrogen fluoride and hydrogen chloride gas by using an absorption liquid (2mmol/L KOH solution), namely completing the absorption of hydrogen fluoride and hydrogen chloride.
The removal rate of the hydrogen fluoride and the hydrogen chloride in each example is shown in Table 2, and the treatment cost is compared with that in Table 3 (the conventional treatment method specifically comprises the step of directly spraying lime powder into a flue to react with acid gas in the flue to generate a solid product, so that the solid product can remove the hydrogen fluoride and the hydrogen chloride with the same quality).
TABLE 2
| Item | Hydrogen fluoride removal rate (%) | Hydrogen chloride removal rate (%) |
| Example 1 | 99.0％ | 96.5％ |
| Example 2 | 98.8％ | 94.5％ |
| Example 3 | 98.5％ | 95.2％ |
TABLE 3
As shown in tables 2 and 3, the method of the present invention, which uses SBA-15 adsorbent to adsorb hydrogen fluoride and hydrogen chloride by fixing on the surface of the filler by high temperature filler roasting technique, has a good effect of removing hydrogen fluoride and hydrogen chloride and a low cost.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (6)
1. A method for adsorbing hydrogen fluoride and hydrogen chloride by using SBA-15 adsorbent is characterized by comprising the following steps: the method comprises the steps of crushing SBA-15 to obtain SBA-15 particles, loading the SBA-15 particles on the surface of a filler by adopting a roasting technology, putting the particles into a filler tower to remove hydrogen fluoride and hydrogen chloride gas, and absorbing unreacted hydrogen fluoride and hydrogen chloride gas by using an absorption liquid to complete the absorption of the hydrogen fluoride and the hydrogen chloride.
2. The method for adsorbing hydrogen fluoride and hydrogen chloride by using the SBA-15 adsorbent as claimed in claim 1, wherein the pulverization is carried out by pulverizing SBA-15 into particles of 40-60 meshes.
3. The method for adsorbing hydrogen fluoride and hydrogen chloride by using the SBA-15 adsorbent according to claim 1, wherein the filler is one or more of high pressure graphite packing, aluminum silicate, borax and kaolin.
4. The method for adsorbing hydrogen fluoride and hydrogen chloride by using the SBA-15 adsorbent as claimed in claim 1, wherein the roasting temperature is 400-500 ℃ and the roasting time is 2-5 h.
5. The method for adsorbing hydrogen fluoride and hydrogen chloride by using the SBA-15 adsorbent as claimed in claim 1, wherein nitrogen is introduced into the packed tower at a gas flow rate of 50-150 mol/min.
6. The method for adsorbing hydrogen fluoride and hydrogen chloride by using the SBA-15 adsorbent as claimed in claim 1, wherein the absorbing solution is 2mmol/L KOH solution.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1887410A (en) * | 2005-06-29 | 2007-01-03 | 财团法人工业技术研究院 | Process and apparatus for treating gas containing fluoric compound |
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