Views: 0 Author: Site Editor Publish Time: 2025-05-08 Origin: Site
Activated Alumina, as a porous adsorption material, can indeed be used to remove chlorides (such as HCl, Cl₂, organochlorine, etc.) from gases or liquids.
1, The principle of dechlorination by activated alumina
A, Physical adsorption: It physically adsorbs chlorine molecules by relying on a high specific surface area (200-400 m²/g) and pore structure.
B, Chemical adsorption: The surface hydroxyl groups (-OH) can react with HCl and other substances to form AlCl₃ or chloroaluminate (chemical bonding).
C, Modification and enhancement: By impregnating alkaline substances (such as NaOH, K₂CO₃), the chemical adsorption capacity for acidic chlorides (such as HCl) is improved.
2. Applicable scenarios
A, Gas dechlorination
Target pollutants: HCl, Cl₂, organochlorine (such as CH₂Cl₂).
Applicable conditions:
Temperature: Room temperature to 200℃ (Thermal stability modification is required at high temperatures).
Humidity: Sensitive to water, pre-drying is required or hydrophobic modified alumina should be selected.
Competitive adsorption: If the gas contains SO₂, H₂S, etc., it may be preferentially adsorbed, reducing the dechlorination efficiency.
B, Liquid dechlorination
Target pollutants: Dissolved chlorine, chlorinated organic compounds (such as chloroform).
Limitation:
Suspended solids in the liquid may clog the pores and require pretreatment and filtration.
PH influence: The adsorption effect of HCl is better under acidic conditions.
C, Applications
Natural gas dechlorination: Remove HCl from the feedstock gas to protect the downstream catalyst.
Petrochemical industry: Remove organochlorine (such as R-Cl) from hydrocarbons to prevent equipment corrosion.
Wastewater treatment: Adsorb chloride ions in wastewater (modification or combination with other materials is required).
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