Abstract
In gasohol, the concentration of aqueous ethanol should be further increased from 95.6 % (by mass) to 99.5 % (by mass) by dehydration. In industrial processes. zeolite 3A is usually applied for alcohol-water separation. However, it adsorbs ethanol and water at a similar level (uptake of water/uptake of ethanol = 2.01), resulting in inefficient separation. In this study, potato starch was chosen as an adsorption material because of its very high selectivity and greater capacity for water (uptake of water/uptake of ethanol = 64.18). Conversely, the adsorption capacity of potato starch after regeneration will be substantially reduced, requiring further modification of the material. After regeneration. the unmodified starch decreased its adsorption capacity by 19.70 %. while the immobilized starch had a slight decrease of only 0.56 %. The sol-gel process was used to immobilize the starch, and the equilibrium adsorption isotherm was obtained to describe the immobilized sorbent. The selectivity of the immobilized starch sorbent had a ratio of 4.39 (water to ethanol). Compared to the zeolite 3A in the industrial dehydration process, this selectivity of immobilized starch is almost double that of zeolite 3A. The Langmuir model best describes the experimental isotherm curve of the selected sorbents.
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