Modeling and simulation of Dynamic Bio-Ethanol Adsorption
نویسندگان
چکیده
One of the limiting factors for the production of bio-ethanol from agricultural waste is its cost of recovery after fermentation. Adsorption has been proposed for this separation and an adsorbent screening study has been done previously (Jones et al., 2006). In this study, ethanol adsorption experiments were performed with selected activated carbon adsorbents in an adsorption packed column. A mass transfer model, solved by finite difference method, is proposed to simulate the adsorption of ethanol from solution. The model incorporates three rate controlling steps: external film mass transfer, intra-particle diffusion and adsorption site kinetics. The model is validated with experimental data at the lab-bench scale and used to simulate a large industrial adsorption process. Results indicate that particle size plays a major role in the ethanol mass transfer from the liquid to solid phase. For large particles the diffusion effects during adsorption are more pronounced. The model can be used to represent the experimental data at the lab-bench scale, and it is hypothesized that the model can be used as a useful tool to simulate adsorption mass transfer in large industrial scale operations.
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