Bioethanol dehydration: State of the art

Фролкова, А. К.; Раева, В. М.

doi:10.1134/s0040579510040342

Cited by 108 publications

(70 citation statements)

References 48 publications

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“…This leads to a change in the value of the activity coefficient of the components in the mixture and therefore the relative volatility of the components is altered (Frolkova and Raeva 2010). To produce pure ethanol through this method, a lot of energy is required in terms of maintaining and recirculating a large quantity of the additional (third) component (Kumar et al, 2010;Gomis et al, 2005).…”

Section: Azeotropic Distillation Processmentioning

confidence: 99%

“…The presence of MTBE in groundwater has led to using ethanol as the replacement in gasoline. The usage of ethanol not only improves the combustibility of gasoline but also lowers carbon monoxide levels in the exhaust (Frolkova and Raeva 2010). In addition, the usage of ethanol fuel helps the current global warming issue by reducing the net emissions of carbon dioxide in the atmosphere.…”

mentioning

confidence: 99%

“…This is because the amount of carbon dioxide released during the production and combustion of ethanol fuel is the same as the one bound into the replanted biomass (Kupiec et al, 2008). Another advantage of using ethanol in gasoline is that no anti-freeze is required in the hydrocarbon based fuel containing at least 10 wt% ethanol (Frolkova and Raeva 2010).…”

mentioning

confidence: 99%

“…The major concern of blending ethanol with hydrocarbon-based fuels is a completely dry ethanol (99.5% by weight) requirement in order to avoid phase separation (Frolkova and Raeva 2010;Vareli et al, 1998). Bioethanol can be derived from a large number of feed stocks such as sugar, starch, and cellulosic materials by fermentation process, which results in a broth with an ethanol concentration of 6-12 %, by weight (Benson and George 2005;Vareli et al, 1998).…”

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confidence: 99%

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Ethanol Dehydration in a Pressure Swing Adsorption Process Using Canola Meal

2013

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Canola meal was used as an adsorbent in a pressure swing adsorption (PSA) apparatus for ethanol dehydration. The experiments were conducted at different pressures, temperatures, vapor superficial velocities, vapor concentrations and particle sizes. Adsorption experiments were performed at equilibrium and breakthrough points. The results demonstrated that canola meal can break the azeotropic point 95.6 wt% and produce over 99 wt% ethanol. At elevated temperature, feed water concentration, and vapor superficial velocity, it was found that the mass transfer rate increased. In addition, the mass transfer rate decreases when either the total pressure or the size of the adsorbent particles are increased. Breakthrough curves were simulated and the overall mass transfer resistance was evaluated at all experimental runs. The internal mass transfer resistance was identified as the relevant mass transfer mechanism.For canola meal, the equilibrium water/ethanol uptake was achieved at 100, 105, and 110˚C. The Frenkel-Halsey-Hill (FHH) and Guggenheim-Andrson-de-Boer (GAB) models perfectly simulated the water adsorption isotherms. By applying Dubinin-Polanyi model to the experimental data, canola meal was identified as a large pore (non-porous) material.The heat of adsorption on canola meal with particle size of 0.43-1.18 mm was determined to be -32.11 kJ/mol. The result confirms that the adsorption process is an exothermic phenomenon and is of physical type due to the fact that the value obtained as the heat of adsorption is negative and its magnitude is within the range 20-80 kJ/mol. The equilibrium water uptake on canola meal was similar to that reported for other starchy and cellulosic adsorbents, while the ethanol uptake was higher.Water saturated canola meal was successfully regenerated by passing nitrogen at 110˚C which is lower than that for molecular sieves commonly used in industry for bioethanol dehydration. The canola meal bio-adsorbent was re-used for more than 32 cycles and no significant change in adsorption capacity was observed.iii ACKNOWLEDGEMENTS

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Section: Azeotropic Distillation Processmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Ethanol Dehydration in a Pressure Swing Adsorption Process Using Canola Meal

2013

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“…Protection of the global environment and depletion of the conventional hydrocarbon fuel supplies have motivated researchers to develop alternative fuels including hydro, wind, biofuels, solar and geothermal energy [1,2]. Fuel grade ethanol, biodiesel and biogas are the most promising biofuels being explored in recent times [3].…”

Section: Introductionmentioning

confidence: 99%

Kinetics Modeling of The Column Adsorption for The Dehydration of Ethanol-Water Mixtures using Biomass Adsorbents

PK¹

2015

J Chem Eng Process Technol

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This study has explored the use of biomass -based adsorbents other than the conventional materials as adsorbent for the dehydration of ethanol -water mixtures. The column study was carried out using enzyme modified corn starch and un-modified corn starch for the adsorptive dehydration of ethanol -water mixtures. The effect of bed heights and flow rates on the breakthrough curves revealed that adsorption efficiency decreased with increased flow rate and increased with bed height. The throughput volume of the anhydrous ethanol -water mixtures increased with increase bed height, due to availability of more sorption sites on the adsorbents. Thomas, Yoon and Nelson, and AdamsBohart kinetic models were used to describe the packed column study. The column kinetics was best described by Yoon and Nelson and Adams -Bohart models. The presence of the hydroxyl O -H stretch group's spectroscopy confirmed the chemical affinity of these adsorbents for water in the ethanol -water mixture. The amorphous or crystallinity nature of the adsorbents was investigated using the X -RD analysis.

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Adsorption

Venkatesan

2013

Separation and Purification Technologies in Biorefineries

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Bioethanol dehydration: State of the art

Cited by 108 publications

References 48 publications

Ethanol Dehydration in a Pressure Swing Adsorption Process Using Canola Meal

Ethanol Dehydration in a Pressure Swing Adsorption Process Using Canola Meal

Kinetics Modeling of The Column Adsorption for The Dehydration of Ethanol-Water Mixtures using Biomass Adsorbents

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