Hot microbubble air-stripping of dilute ethanol-water mixtures

Product inhibition and the cost of downstream separations are two main barriers in using lignocellulosic biomass for bioethanol production. If bioethanol can be continuously removed from fermentation broth without affecting the fermentation process, significant gains can be achieved with bioethanol...

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Main Authors:	Joseph Calverley, William B Zimmerman, David J Leak, Hemaka Bandulasena
Format:	Default Article
Published:	2020
Subjects:	Chemical Engineering Chemical Sciences Engineering
Online Access:	https://hdl.handle.net/2134/13042589.v1
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id	rr-article-13042589
record_format	Figshare
spelling	rr-article-130425892020-10-15T00:00:00Z Hot microbubble air-stripping of dilute ethanol-water mixtures Joseph Calverley (2865242) William B Zimmerman (9454037) David J Leak (9454040) Hemaka Bandulasena (1247538) Chemical Engineering Chemical Sciences Engineering Product inhibition and the cost of downstream separations are two main barriers in using lignocellulosic biomass for bioethanol production. If bioethanol can be continuously removed from fermentation broth without affecting the fermentation process, significant gains can be achieved with bioethanol yields and process efficiency. Hot microbubble clouds generated by energy efficient means have been used to remove ethanol from dilute ethanol-water mixtures (~4% [v/v]) maintained at 60oC, and the effect of key operating parameters on the stripping rate has been studied. Numerical simulations of a hot microbubble rising in a dilute ethanol-water mixture was also performed to understand the instantaneous concentrations within the gas phase. Increasing the inlet gas temperature from 90oC to 150oC and decreasing the liquid height in the unit from 50 mm to 5 mm both increased the ethanol stripping rate. However, the benefit of increasing the gas temperature for maximum ethanol removal depended on the liquid height in the unit. Under all operating conditions, ethanol concentration was reduced below ~2% [v/v] within ~25 minutes of operation, demonstrating the potential of hot microbubble stripping for product removal from lignocellulosic fermenters. Implemented effectively in a fermenter, this technology could intensify the bioethanol production process and improve process economics. 2020-10-15T00:00:00Z Text Journal contribution 2134/13042589.v1 https://figshare.com/articles/journal_contribution/Hot_microbubble_air-stripping_of_dilute_ethanol-water_mixtures/13042589 CC BY 4.0
institution	Loughborough University
collection	Figshare
topic	Chemical Engineering Chemical Sciences Engineering
spellingShingle	Chemical Engineering Chemical Sciences Engineering Joseph Calverley William B Zimmerman David J Leak Hemaka Bandulasena Hot microbubble air-stripping of dilute ethanol-water mixtures
description	Product inhibition and the cost of downstream separations are two main barriers in using lignocellulosic biomass for bioethanol production. If bioethanol can be continuously removed from fermentation broth without affecting the fermentation process, significant gains can be achieved with bioethanol yields and process efficiency. Hot microbubble clouds generated by energy efficient means have been used to remove ethanol from dilute ethanol-water mixtures (~4% [v/v]) maintained at 60oC, and the effect of key operating parameters on the stripping rate has been studied. Numerical simulations of a hot microbubble rising in a dilute ethanol-water mixture was also performed to understand the instantaneous concentrations within the gas phase. Increasing the inlet gas temperature from 90oC to 150oC and decreasing the liquid height in the unit from 50 mm to 5 mm both increased the ethanol stripping rate. However, the benefit of increasing the gas temperature for maximum ethanol removal depended on the liquid height in the unit. Under all operating conditions, ethanol concentration was reduced below ~2% [v/v] within ~25 minutes of operation, demonstrating the potential of hot microbubble stripping for product removal from lignocellulosic fermenters. Implemented effectively in a fermenter, this technology could intensify the bioethanol production process and improve process economics.
format	Default Article
author	Joseph Calverley William B Zimmerman David J Leak Hemaka Bandulasena
author_facet	Joseph Calverley William B Zimmerman David J Leak Hemaka Bandulasena
author_sort	Joseph Calverley (2865242)
title	Hot microbubble air-stripping of dilute ethanol-water mixtures
title_short	Hot microbubble air-stripping of dilute ethanol-water mixtures
title_full	Hot microbubble air-stripping of dilute ethanol-water mixtures
title_fullStr	Hot microbubble air-stripping of dilute ethanol-water mixtures
title_full_unstemmed	Hot microbubble air-stripping of dilute ethanol-water mixtures
title_sort	hot microbubble air-stripping of dilute ethanol-water mixtures
publishDate	2020
url	https://hdl.handle.net/2134/13042589.v1
_version_	1797459499402919936

Hot microbubble air-stripping of dilute ethanol-water mixtures

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