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Supercritical extraction as an effective first-step in a maize stover biorefinery

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JournalRSC Advances
DatePublished - 7 May 2015
Issue number54
Volume5
Number of pages8
Pages (from-to)43831-43838
Original languageEnglish

Abstract

Supercritical carbon dioxide (scCO<inf>2</inf>) has been investigated for the generation of valuable waxy compounds and as an added-value technology in a holistic maize stover biorefinery. ScCO<inf>2</inf> extraction and fractionation was carried out prior to hydrolysis and fermentation of maize stover. Fractionation of the crude extracts by scCO<inf>2</inf> resulted in wax extracts having different compositions and melting temperatures, enabling their utilisation in different applications. One such fraction demonstrated significant potential as a renewable defoaming agent in washing machine detergent formulations. Furthermore, scCO<inf>2</inf> extraction has been shown to have a positive effect on the downstream processing of the maize stover. Fermentation of the scCO<inf>2</inf> extracted maize stover hydrolysates exhibited a higher glucose consumption and greater potential growth for surfactant (in comparison with non-scCO<inf>2</inf> treated stover) axnd ethanol production (a 40% increase in overall ethanol production after scCO<inf>2</inf> pre-treatment). This work represents an important development in the extraction of high value components from low value wastes and demonstrates the benefits of using scCO<inf>2</inf> extraction as a first-step in biomass processing, including enhancing downstream processing of the biomass for the production of 2<sup>nd</sup> generation biofuels as part of an integrated holistic biorefinery.

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