Effects of acid and alkali promoters on compressed liquid hot water pretreatment of rice straw
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Author list: Imman S., Arnthong J., Burapatana V., Champreda V., Laosiripojana N.
Publisher: Elsevier
Publication year: 2014
Journal: Bioresource Technology (0960-8524)
Volume number: 171
Start page: 29
End page: 36
Number of pages: 8
ISSN: 0960-8524
Languages: English-Great Britain (EN-GB)
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Abstract
In this study, effects of homogeneous acid and alkali promoters on efficiency and selectivity of LHW pretreatment of rice straw were studied. The presences of acid (0.25%v/v H2SO4, HCl, H3PO4, and oxalic acid) and alkali (0.25w/v NaOH) efficiently promoted hydrolysis of hemicellulose, improved enzymatic digestibility of the solids, and lower the required LHW temperature. Oxalic acid was a superior promoter under the optimal LHW conditions at 160ฐC, leading to the highest glucose yield from enzymatic hydrolysis (84.2%) and the lowest formation of furans. Combined with hydrolyzed glucose in the liquid, this resulted in the maximal 91.6% glucose recovery from the native rice straw. This was related to changes in surface area and crystallinity of pretreated biomass. The results showed efficiency of external promoters on increasing sugar recovery and saving energy in LHW pretreatment. ฉ 2014 Elsevier Ltd.
Keywords
Liquid hot water pretreatment
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