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Impact of Conditioning Prior to Dilute Acid Deconstruction of Biomass for the Production of Fermentable Sugars
DBT-IOC Centre for Advance Bioenergy Research, R&D Centre, Indian Oil Corporation Ltd, Faridabad, India.
DBT-IOC Centre for Advance Bioenergy Research, R&D Centre, Indian Oil Corporation Ltd, Faridabad, India.
DBT-IOC Centre for Advance Bioenergy Research, R&D Centre, Indian Oil Corporation Ltd, Faridabad, India.
DBT-IOC Centre for Advance Bioenergy Research, R&D Centre, Indian Oil Corporation Ltd, Faridabad, India.
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2017 (English)In: ACS Sustainable Chemistry & Engineering, E-ISSN 2168-0485, Vol. 5, no 5, p. 4285-4292Article in journal (Refereed) Published
Abstract [en]

Cost of cellulases is a major impediment in commercialization of cellulosic ethanol. To reduce the enzyme doses for the production of fermentable sugars from rice straw (RS), a series of alkali conditioning experiments were conducted prior to dilute acid (DA) pretreatment. This approach resulted in removal of a majority of extractives, ash, acetic acid, and part lignin, and thus resulted in lowering pseudolignin formation thereby increasing enzymatic hydrolysis yields. Glucan hydrolysis of 69.8%, 74.0%, and 83.5% was obtained at 10 wt % water insoluble solid (WIS) using 8 FPU enzyme/g WIS of biomass conditioned using 0.2, 0.4, and 0.5 wt % alkali prior to pretreatment, which is 14–37% higher than the control (61.0%). The overall sugar recovery in these experiments were 69.2%, 70.2%, and 68.5% at 15 wt % WIS resulting in a sugar concentration greater than 120 g/L, which in turn can produce approximately 5–6% w/v ethanol concentration in fermentation broth. It was found that this approach resulted in a decrease of the enzyme consumption vis-a-vis the conventional process by 46.4% to recover the same amount of sugars. This lowering of enzyme consumption has resulted in net savings, after taking into account the cost of alkali used in the conditioning steps.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2017. Vol. 5, no 5, p. 4285-4292
Keywords [en]
Alkali conditioning, Dilute acid pretreatment, Economic analysis, Enzymatic hydrolysis, Rice straw
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:hig:diva-26930DOI: 10.1021/acssuschemeng.7b00302OAI: oai:DiVA.org:hig-26930DiVA, id: diva2:1216747
Available from: 2018-06-12 Created: 2018-06-12 Last updated: 2018-06-12Bibliographically approved

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Soam, Shveta

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