Liquid phase adsorption of multi-compenent organic solvent mixture onto activated carbon
Liquid phase adsorption is a common technique in separation process. Most of the measurement and analysis of liquid phase adsorption are based on a single component adsorption. However, in the true process most of the adsorption process occurs in multi-component system. Hence, in this work a study o...
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| Format: | Thesis |
| Language: | English English |
| Published: |
2014
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| Subjects: | |
| Online Access: | https://eprints.ums.edu.my/id/eprint/41271/1/24%20PAGES.pdf https://eprints.ums.edu.my/id/eprint/41271/2/FULLTEXT.pdf |
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| Summary: | Liquid phase adsorption is a common technique in separation process. Most of the measurement and analysis of liquid phase adsorption are based on a single component adsorption. However, in the true process most of the adsorption process occurs in multi-component system. Hence, in this work a study of liquid phase adsorption at complete range of concentration for binary and multicomponent onto adsorbent was conducted. Organic solvents such as methanol, propanol and acetone were selected as the adsorbate, whereas activated carbon was chosen as the adsorbent. Mixture of binary and three components of solvent were used as the liquid phase for the comparison. The experimental work was conducted by measuring the excess isotherm of azeotropic and non-azeotropic mixture. Result show that the excess isotherm can be explained according to the adsorption isotherm classified by Schay and Nagy. The analysis and interpretation of adsorption isotherm was carried out using Pseudo Ideal Adsorption Model for binary adsorption, Gibbs Dividing Plane Model and Langmuir-Freundlich Model for both binary and multi-component adsorption and Modified Competitive Langmuir Like Model for multi-component adsorption. Analysis of Pseudo-ideal monolayer adsorption shows that the total adsorption of Methanol-Propanol mixture was 11.79 mmole/g, Methanol-Acetone mixture 4.37 mmole/g, and Acetone-Propanol mixture 4.40 mmole/g. The result of adsorption isotherm was presented as adsorptivity of preference solvent. The adsorptivity of preference solvent from theoretical analysis was also compared with the directly measured adsorbed phase concentration. The trend of adsorption isotherms curve determined from the theoretical models was shown a monolayer adsorption behavior. However, the magnitudes of numerical values of adsorption from theoretical analysis methods used and directly measured adsorbed phase concentration were different from each other. Therefore it shows that the selection of theoretical analysis is important in the determination of adsorption isotherm. Besides that, the effect of binary adsorption and multicomponents adsorption can be observed on the shape of excess adsorption isotherm and also on the magnitude of individual adsorption isotherm. Thus, assumption of single component adsorption in multi-components system may lead prediction of unrealistic process. |
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