研究目的
To examine the purification of halogen-substituted hydrocarbon solvents to the level required for cleaning of optical surfaces, specifically to remove acids and water using AV-17-8 anion exchanger.
研究成果
The AV-17-8 anion exchanger exhibits superequivalent absorption of Cl– ions, with equilibrium sorption capacity 2-3 times its exchange capacity, increasing with humidity. This enhances the purification of halogen-substituted solvents by removing acids and water, improving solvent stability and reducing corrosion on metal optics. The findings support the use of this method for efficient solvent recycling in cleaning applications.
研究不足
The study is limited to specific solvents (CCl4 and Freon-114B2) and the AV-17-8 anion exchanger; stability in other organic solvents or at higher temperatures may vary. The experimental setup used small-scale columns, which may not fully represent industrial-scale applications. The humidity control method may not account for all variations in anion exchanger properties.
1：Experimental Design and Method Selection:
The study involved preparing AV-17-8 anion exchanger with varied humidity using the isopiestic method, and evaluating its exchange capacity and sorption dynamics from model solutions of HCl in CCl4 and Freon-114B2 solvents. Ion-exchange and superequivalent absorption mechanisms were investigated.
2：Sample Selection and Data Sources:
Model solutions were prepared from Freon-114B2 and CCl4 solvents, dried to a mass fraction of water not exceeding 0.003%, and saturated with dried gaseous HCl. AV-17-8 anion exchanger was used as the ion-exchange resin.
3：003%, and saturated with dried gaseous HCl. AV-17-8 anion exchanger was used as the ion-exchange resin.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Glass columns (8.5 mm diameter), Te?on pistons, measuring flasks, pH meter, H2SO4, NaCl, phenolphthalein, deionized water, AV-17-8 anion exchanger, Freon-114B2, CCl4, HCl gas.
4：5 mm diameter), Te?on pistons, measuring flasks, pH meter, H2SO4, NaCl, phenolphthalein, deionized water, AV-17-8 anion exchanger, Freon-114B2, CCl4, HCl gas.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Weighed portions of anion exchanger were treated with NaCl solution to convert to Cl– form, washed, dried, and humidity determined. Model solutions were passed through columns packed with anion exchanger in OH– form at controlled rates. Eluted solutions were collected, and HCl concentration was analyzed by extraction into water and titration.
5：Data Analysis Methods:
Exchange capacity and superequivalent absorption were calculated based on titration results. Sorption dynamics were plotted as concentration vs. volume of eluted solution, and breakthrough capacities were determined.
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