• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A method for purifying waste gases from hydrogen fluoride by adsorbing hydrogen fluoride to alumina and then separating the pypegium-air mixture in filters, characterized in that, in order to reduce the purification time, the adsorption is carried out in a two-section reactor at a flow rate of 0.7-0.9 first then 4.9-5.1 m / s.
    公开号:SU1093237A3
    申请号:SU721843466
    申请日:1972-10-26
    公开日:1984-05-15
    发明作者:Бари Марсель；Карлссон Курт
    申请人:Флект Ав (Фирма)；
    IPC主号:
    专利说明:

    CO 110 The invention relates to a process for the purification of flue gases resulting from the electrolytic production of aluminum from hydrogen fluoride. A method is known for extracting hydrogen fluoride from waste gases with a 5% soda solution, followed by drying the resulting sodium fluoride and returning it to electrolysis. The closest to the invention is a method for cleaning exhaust gases from hydrogen fluoride with powdered aluminum oxide in a fluidized bed reactor with the subsequent separation of the solid phase, which is returned to the electric baths C2J. In this method, gases from electrolytic baths with a concentration of hydrogen fluoride up to 1.24 g / m are served under a layer of alumina with a thickness of
    5-30 cm with the speed required for fluidization and providing a contact time of 0.25-1.5 s. The degree of gas purification is 99-100% with an alumina consumption of 150 kg per 1 kg of hydrogen fluoride. Aluminum oxide is at. purification system 2-14 hours, pressure drop required for the process, 200-400 mm water.
    The disadvantage of this method is a long cleaning time, up to 60 seconds.
    The purpose of the invention is to reduce the cleaning time.
     The goal is achieved by the adsorption of hydrogen fluoride being aluminum oxide in a two-section reactor at a flow rate
    0.7-0.9 and 4.9-5.1 m / s, respectively. After separation of a 95-97% adsorbent in a cyclone, the P & G mixture is fed to a fabric filter with a surface
    5 150 m, where the final hell occurs, sorption of hydrogen fluoride and separation of the solid phase. The maximum degree of adsorption (99.9%) is achieved at an alumina consumption of 600 kg / h.
    30 which is 80% of the amount required for the operation of the electrolytic baths. The residence time of the gas in the cleaning system is 10-30 seconds.
    The implementation of the proposed method also reduces the residence time of the adsorbent in the purification system to 5-30 minutes and reduces the pressure drop to 50-100 mm water column. 72 first 0.7-0.9, and then 4.9-5.1 m / s, followed by separation of the air-gas mixture in the filters. The proposed method can be carried out according to the following technological scheme. Alumina is injected into the gas from the electrolytic bath containing 500-1000 mg / m of hydrogen fluoride. which has a specific surface of 60 and includes up to 25% oC-Ablo,. The dust-gas mixture formed with a bulk velocity of 6,200 is sent to a two-section reactor where hydrogen fluoride is adsorbed by aluminum oxide, first in the first section during and then in the second within 1-2 seconds. The flow rate of the gas mixture in the first and second sections is are
    权利要求:
    Claims (1)
    [1]
    METHOD FOR CLEANING EXHAUST GASES from hydrogen fluoride by adsorption of hydrogen fluoride with aluminum oxide followed by separation of dust-gas mixture in filters, characterized in that, in order to reduce cleaning time, adsorption is carried out in a two-section reactor at a flow rate of 0.7-0.9, and then 4.9-5.1 m / s.
    SB with in
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    类似技术:
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    SU706322A1|1979-12-30|Method of purifying sodium hypochlorite
    SU471301A1|1975-05-25|The method of purification of saline antimony solutions from mouse
    US3337302A|1967-08-22|Desulfurization of chlorine
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    同族专利:
    公开号 | 公开日
    IT969635B|1974-04-10|
    FR2161933A1|1973-07-13|
    CA965932A|1975-04-15|
    NO131209B|1975-01-13|
    FR2161933B1|1975-03-28|
    SE362901B|1973-12-27|
    US3827955A|1974-08-06|
    JPS5533373B2|1980-08-30|
    JPS4850978A|1973-07-18|
    NO131209C|1975-04-23|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3503184A|1968-03-07|1970-03-31|Aluminum Co Of America|Treatment of gases evolved in the production of aluminum|US3992176A|1973-10-24|1976-11-16|Kaiser Aluminum & Chemical Corporation|Dry scrubbing tar and fluoride laden gases|
    DE2403282A1|1974-01-24|1975-11-06|Metallgesellschaft Ag|PROCESS FOR THE SEPARATION OF HYDROGEN FROM ALUMINUM ELECTROLYSIS EXHAUST GASES BY DRY ADSORPTION OF ALUMINUM OXIDE WITH COMPLETE SEPARATION OF THE DAMAGING ELEMENTS|
    US4002551A|1975-04-17|1977-01-11|Aluminium Pechiney|Process and apparatus for collecting the fumes given off during the production of aluminium in an electrolysis cell with a continuous anode|
    US4062696A|1976-07-27|1977-12-13|Kaiser Aluminum & Chemical Corporation|Purification of contaminated alumina scavengers of aluminum reduction cell effluent dry scrubber systems|
    US4166779A|1977-02-18|1979-09-04|Societa Alluminio e Metalli Alumetal S.p.A.|Electrolytic process for producing aluminium|
    DE3001910C2|1980-01-19|1981-11-12|Vereinigte Aluminium-Werke Ag, 5300 Bonn|Method and device for separating dust from the waste gases of the aluminum smelting electrolysis|
    US4299683A|1980-07-17|1981-11-10|Aluminum Company Of America|Apparatus and method for efficient transfer of powdered ore|
    DE3106526A1|1981-02-21|1982-09-16|L. & C. Steinmüller GmbH, 5270 Gummersbach|METHOD FOR MINIMIZING EMISSIONS FROM POLLUTION PLANTS|
    DE3106580A1|1981-02-21|1982-09-02|L. & C. Steinmüller GmbH, 5270 Gummersbach|METHOD FOR MINIMIZING EMISSIONS FROM POLLUTION PLANTS|
    JPS58501951A|1981-11-04|1983-11-17|
    CA1197074A|1981-12-04|1985-11-26|Isaias Loukos|Method and apparatus for cleaning waste gases fromaluminum production facilities|
    FR2534831B1|1982-10-25|1985-02-08|Air Ind|
    FR2620738B1|1987-09-18|1989-11-24|Pechiney Aluminium|PROCESS FOR REGULATING THE ACIDITY OF THE ELECTROLYSIS BATH BY RECYCLING THE FLUORINATED PRODUCTS EMITTED BY THE HALL-HEROULT ELECTROLYSIS TANKS|
    IS3896A|1991-08-07|1993-02-08|Comalco Aluminium Limited|Purification of gaseous fluorides from industrial emissions|
    SE503678C2|1994-11-23|1996-07-29|Flaekt Ab|Methods and apparatus for separating substances from a gaseous medium by dry adsorption|
    US5814127A|1996-12-23|1998-09-29|American Air Liquide Inc.|Process for recovering CF4 and C2 F6 from a gas|
    CN110217812A|2019-07-12|2019-09-10|神华准能资源综合开发有限公司|A method of aluminium oxide is prepared by crystal aluminum chloride|
    CN110618237A|2019-09-23|2019-12-27|东北大学|Fluorine concentration measuring device, fluorine concentration measuring method, and method for measuring adsorption efficiency of adsorbent|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE13676/71A|SE362901B|1971-10-27|1971-10-27|
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