Microcalorimetric study of sorption of water and ethanol in zeolites 3A and 5A

Lalik, E.; R, Mirek; Rakoczy, Jan; Groszek, A. J.

doi:10.1016/j.cattod.2006.01.006

Cited by 75 publications

(44 citation statements)

References 11 publications

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“…On the other hand, the product concentration was largely dependent on feed concentration. It should be noted that during adsorption and regeneration the temperature increased and decreased in the range of 10-15 o C due to heat of adsorption and heat used to evaporate water during desorption, respectively [12,13]. The PSA unit maintained the temperature by slightly adapting the feed temperature so that it would compensate with heat released or consumed during adsorption or desorption, respectively.…”

Section: Second Phase-psa Pilot Plantmentioning

confidence: 99%

Production of pure ethanol from azeotropic solution by pressure swing adsorption

Pruksathorn

Vitidsant

2009

Korean J. Chem. Eng.

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There has been a gaining interest in the use of fuel ethanol from fermentation process. A main challenge in producing the ethanol concerned the production cost which was largely contributed by the process of water removal. Distillation could remove water to a certain level but due to ethanol-water azeotrope an extra process was needed before ethanol could be blended with gasoline. Problem statement: Pressure Swing Adsorption (PSA) process was attractive for final separation since it required less energy and lower setup cost. Despite many researches on simulation and experimental works on adsorption of water on 3A zeolite in a fixed bed, none have studied a process with the actual PSA system. Approach: The purpose of this research was to study the PSA process with two adsorbers and effects of several parameters. The research also included analysis of kinetic and thermodynamic data of ethanol-water adsorption on commercial 3A zeolites in a single fixed bed. Two-level factorial design experiment was used in this research works to preliminary screen the influence and interaction among each factor. Results: From the experimental works, it was found that the most suitable condition for water adsorption on 30 g of zeolite was at 90°C initial bed temperature, feed flow rate of 1 mL min −1 and feed concentration of 95% vol ethanol. Langmuir isotherm could best predict the experimental results and the corresponding equation was proposed. In the PSA pilot test, the principal factors, which had an effect on the adsorption rate, recovery, and the enrichment of the product, were feed rate, feed concentration, adsorption pressure and the cycle time. Prediction of the process efficiency in terms of ethanol recovery and enrichment was proposed in the form of regression models. Conclusions/Recommendations: The results of the study in a fixed bed adsorber could help designing a pilot scale PSA unit. The experiments proved to be successful in terms of producing high concentration ethanol with acceptable percentage of ethanol recovery. With further simulation works, the process could be scaled up for an industrial use.

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Section: Second Phase-psa Pilot Plantmentioning

confidence: 99%

Production of pure ethanol from azeotropic solution by pressure swing adsorption

Pruksathorn

Vitidsant

2009

Korean J. Chem. Eng.

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“…The sorption capacity of ethanol on a 3A zeolite was measured using microcalorimetry [24] and breakthrough apparatus [21]; the reported ethanol sorption capacity was 0.044 mol kg −1 at 100 • C and 0.03 mol kg −1 at 167 • C, respectively. In both cases, it was concluded that the extent of ethanol adsorption was minimal.…”

Section: Adsorption Equilibrium and Kineticsmentioning

confidence: 99%

Dehydration of Ethanol using Pressure Swing Adsorption

Simo¹

2013

Separation and Purification Technologies in Biorefineries

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“…As soon as the crude ethanol vapor is introduced into the bed, rapid water adsorption takes place accompanied by significant heat generation. This strong overshooting of the temperature during the start-up because of the exothermicity of the reaction is well known [19].…”

Section: Transient Start-up Of the Psa Unit For Breakthrough Experimentsmentioning

confidence: 95%

Production of dehydrated fuel ethanol by pressure swing adsorption process in the pilot plant

Jeong¹,

Jang²,

Kim

et al. 2009

Korean J. Chem. Eng.

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Fermented ethanol is gaining wide popularity as a car fuel additive. The pressure swing adsorption (PSA) process is attractive for the dehydration of bioethanol on the industrial scale, since its energy consumption is low and it is capable of producing a very pure product. 3 Å zeolite possesses micro-pores which, due to their small size, adsorb water molecules but not ethanol molecules. In this work, up to 2 kL/day of dehydrated ethanol (99.5% by weight) was successfully produced with 3 Å zeolite by the pressure swing adsorption process. The cycles of the PSA process were operated under the following variables: feed flow rate (27-62 Nm 3 /hr of 93.2% by weight), purge/feed ratio (30-24%), adsorption temperature (130-140 o C) and adsorption pressure (1.2 atm).

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Microcalorimetric study of sorption of water and ethanol in zeolites 3A and 5A

Cited by 75 publications

References 11 publications

Production of pure ethanol from azeotropic solution by pressure swing adsorption

Production of pure ethanol from azeotropic solution by pressure swing adsorption

Dehydration of Ethanol using Pressure Swing Adsorption

Production of dehydrated fuel ethanol by pressure swing adsorption process in the pilot plant

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