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Physicochemical factors affecting ethanol adsorption by activated carbon
K J Bradley1, M K Hamdy, R T Toledo
1Department of Food Science, University of Georgia Athens, Georgia 30602.
Biotechnology and Bioengineering
|March 1, 1987
Summary
Activated charcoal effectively adsorbs ethanol from aqueous solutions, with optimal performance at 25°C. Granular activated charcoal demonstrated superior ethanol adsorption capacity compared to powdered forms.
Area of Science:
- Adsorption Science
- Separation Technology
- Chemical Engineering
Background:
- Activated charcoal is widely used for separation and purification processes.
- Understanding ethanol adsorption is crucial for applications in fermentation and biofuel industries.
Purpose of the Study:
- To evaluate the adsorptive properties of powder and granular activated charcoal for ethanol removal from aqueous mixtures.
- To investigate the effects of temperature, pH, ionic strength, and charcoal pre-treatment on ethanol adsorption capacity.
Main Methods:
- Adsorption isotherms were used to quantify ethanol adsorption capacity.
- Experiments were conducted at various temperatures (5-40°C), pH levels (acidic to alkaline), and ionic strengths.
- Charcoal samples underwent thermal pre-treatment under different atmospheres (N2, CO2) and temperatures.
- Ethanol removal was assessed using a packed column system with varying charcoal bed weights and flow rates.
Main Results:
- Ethanol adsorption capacity was highest at 25°C and decreased at higher temperatures.
- Adsorption decreased with increasing pH from acidic to alkaline conditions.
- Optimal ethanol adsorption was observed at an ionic strength of 0.09.
- Granular activated charcoal exhibited superior performance over powdered charcoal.
- Thermal pre-treatment at 400°C (N2) and 600°C (N2) enhanced adsorption, while 1000°C (CO2) reduced it.
- Lower feed flow rates and reduced carbon bed weight per unit volume increased ethanol adsorption efficiency.
Conclusions:
- Temperature, pH, and ionic strength significantly influence ethanol adsorption by activated charcoal.
- Granular activated charcoal is a more effective adsorbent for ethanol than powdered forms.
- Optimized pre-treatment and operating conditions can enhance ethanol adsorption efficiency for industrial applications.
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