Dehydration of Ethanol: New Approach Gives Positive Energy Balance

Ladisch, Michael R.; Dyck, Karen Van

doi:10.1126/science.205.4409.898

Cited by 198 publications

(95 citation statements)

References 8 publications

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“…Over the last 25 years, renewable, domestic sources of fuels and chemicals have become highly important (Ladisch and Dyck, 1979). For example, bioethanol is a potential alternative to petroleum-derived transportation fuels, because bioethanol has a higher octane number, broader flammability limits, higher flame speeds and higher heat of vaporisation (Neelakandan and Usharani, 2009;de Oliveria et al, 2005;Grad, 2006;Balat, 2007;Wheals et al, 2009;Govindaswamy and Vane, 2007).…”

Section: Introductionmentioning

confidence: 99%

Enzymatic Hydrolysis of Lignocellulose for Bioethanol Production

Rozenfelde

Puķe

Krūma

et al. 2017

Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences.

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Section: Introductionmentioning

confidence: 99%

Enzymatic Hydrolysis of Lignocellulose for Bioethanol Production

Rozenfelde

Puķe

Krūma

et al. 2017

Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences.

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“…Some researchers have investigated the use of biomaterials such as corn grits as absorbents 40,41 to reduce the energy consumption in the ethanol purification part of the plant. We propose the use of a bed made of corn grits to selectively adsorb water from an ethanol-water vapor mixture coming from the mixer Mix3.…”

Section: Adsoprtion Corn Gritsmentioning

confidence: 99%

“…The ethanol-water mixture increases the bed temperature as the water adsorbs into the bed. The maximum concentration of ethanol obtainable at the outlet of the bed is assumed to be 97.7% w/w 40 . We consider a scheme using two corn grit beds working in parallel, one being saturated with water while the other is dehydrated (or regenerated).…”

Section: Adsoprtion Corn Gritsmentioning

confidence: 99%

Energy optimization of bioethanol production via hydrolysis of switchgrass

Martı́n

Grossmann

2011

AIChE Journal

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Abstract.In this work, we propose the optimal flowsheet for the production of bioethanol from switchgrass, via hydrolysis. A superstructure embedding a number of alternatives is proposed. Two technologies are considered for switchgrass pretreatment, dilute acid and ammonia fibre explosion (AFEX) so that the structure of the grass is broken down. Next, enzymatic hydrolysis follows any of the pretreaments to obtain fermentable sugars, mainly xylose and glucose. Ethanol is obtained by fermentation of the sugars. In order to obtain fuel quality ethanol, water must be removed from the water-ethanol mixture. A number of dehydration technologies is considered including rectification, adsorption in corn grits, molecular sieves and pervaporation. The problem is formulated as an MINLP. The superstructure is optimized by decomposing the MINLP for each of the pretreaments. Then, multieffect columns and heat integration are used to reduce the energy consumption and cooling needs. Finally, an economic evaluation is performed. The optimal flowsheet consists of using dilute acid hydrolysis followed by molecular sieves as dehydration technology, which requires less energy and cooling and yielding a promising production price of 0.8 $/gal.

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“…The maximum concentration of ethanol obtainable at the outlet of the bed is assumed to be 97.7% with a recovery of 90% w/w. 56 After the bed is saturated with water, the vapor can be sent to splitter Spl8, and from there to either mixer Mix8 or Mix 10, while fresh adsorbent enters the column and a new adsorber bed is…”

Section: Synthesismentioning

confidence: 99%

Energy optimization of bioethanol production via gasification of switchgrass

2011

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Abstract.In this paper, we address the conceptual design of the bioethanol process from switchgrass via gasification. A superstructure is postulated for optimizing energy use that embeds direct or indirect gasification, followed by steam reforming or partial oxidation. Next, the gas composition is adjusted with membrane-PSA or water gas shift. Membrane separation, absorption with ethanol-amines and PSA are considered for the removal of sour gases. Finally, two synthetic paths are considered, high alcohols catalytic process with two possible distillation sequences, and syngas fermentation with distillation, corn grits, molecular sieves and pervaporation as alternative deshydration processes. The optimization of the superstructure is formulated as an MINLP problem using short-cut models, and solved through a special decomposition scheme that is followed by heat integration.The optimal process consists of direct gasification followed by steam reforming, removal of the excess of hydrogen and catalytic synthesis, yielding a potential operating cost of $0.41/gal

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Dehydration of Ethanol: New Approach Gives Positive Energy Balance

Abstract: Water was removed from aqueous ethanol by using cellulosic materials, starch, corn, and other agents. The combustion energy of the ethanol product can exceed the energy needed to carry out the dehydration by a factor of 10.

Cited by 198 publications

References 8 publications

Enzymatic Hydrolysis of Lignocellulose for Bioethanol Production

Enzymatic Hydrolysis of Lignocellulose for Bioethanol Production

Energy optimization of bioethanol production via hydrolysis of switchgrass

Energy optimization of bioethanol production via gasification of switchgrass

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