固定化澱粉質吸附材於乙醇脫水
之動態吸附研究

許瑋真

doi:10.6840/CYCU.2011.00455

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固定化澱粉質吸附材於乙醇脫水之動態吸附研究

Kinetic Adsorption Study for Ethanol dehydration using Immobilization starch-based adsorbent

許瑋真 , Masters　　Advisor：鍾財王　　

繁體中文 DOI： 10.6840/CYCU.2011.00455

生物吸附材；固定化；貫流曲線；溶膠-凝膠；乙醇-水混合物； Bio-adsorbent ； Immobilize ； Breakthrough curve ； Sol-Gel ； Ethanol-water mixture.

Abstract │ Reference (41) │ Times Cited (8) │ Altmetrics

Abstract 〈TOP〉

Parallel Abstract 〈TOP〉

In the distillation separation of ethanol vapor and water vapor, it can form an zoetrope at 78.2℃, at which there are 95.6wt% ethanol and 4.4wt% water. Traditional azeotropic distillation and extractive distillation to obtain anhydrous ethanol need more energy than adsorption. Adsorption as a low energy consumption process has attracted attention to apply in ethanol dehydration. Recently, some investigators have tried to use starch to replace Zeolite 3A. However, it has a low efficiency in adsorption selectivity and regeneration and starch powder was become glue after adsorption with water vapor. In the present study, starch was immobilized using sol-gel method to solve these problems. This study obtained adsorption equilibrium data by the BET experiment for water and ethanol on immobilized starch. Then isotherm curve and the parameters by numerical method and expressed by the Langmuir isotherm. The isotherm is applied to analyze the effect of the variables such as feed concentration, velocity, particle size and bed length on the breakthrough performance. Breakthrough curves of ethanol were measured by using a gas-phase FT-IR instead of traditional GC. Application of the gas-phase FT-IR could detect changes of gas concentration more fast than the traditional GC. Results showed that on influence of feed concentration, velocity, particle size and bed length is significant on different on breakthrough time and breakthrough curve shape. The effects of particle size and bed length on outlet concentration (C/Co) is significant, with increase of the velocity the roll-over
phenomenon is more obvious. In dynamic absorption, the slope of breakthrough curve and C/Co may represent mass transfer behavior. The optimum experimental parameters were expressed as follows: Inlet concentration: 92%, particle size: 1~2 mm, velocity: 500 sccm and the length of the bed: 7cm.

Reference ( 41 ) 〈TOP〉

[3] Ladishc M R, Dyck K K., “Dehydration of ethanol: New approach gives positive energy balance”, J. Science, 205, 898-900, 1979
連結：
[5] Pitt, W.W., G.L. Hagg and D.D. Lee, “Recovery of Ethanol from Fermentation Broths Using Selective Sorption-Desorption”, Biothernol. Bioeng., 25(1), 123-131, 1983.
連結：
[6] Farhadpour, F.A. and A. Bono, “Sorption Separation of Ethanol-Water Mixture With a Bi-dispersed Hydrophobic Molecular Sieve, Sillicalite : Determination of the Controlling Mass Transfer Mechanism”, Chem. Eng. Process, 35(2),141-155, 1996
連結：
[8] Teo, W.K. and D.M. Ruthven, “Adsorption of Water from Aqueous Ethanol Using 3A Molecular Sieves”, Ind. Eng. Chem. Process Des. Dev., 25(1), 17-21, 1986.
連結：
[9] Rao, D.R. and S. Sircar, “Liquid-phase Adsorption of Bulk Ethanol-Water Mixtures by Alumina”, Adsorpt. Sci. Technol., 10, 93-104, 1993.
連結：

Times Cited (8) 〈TOP〉

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