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The role of supercritical fluids in the fractionation pretreatments of a wheat bran-based biorefinery

•Fractionation and hydrolysis of wheat bran using pressurized fluids are revised.•Wheat bran is analyzed as a biorefinery feedstock.•The hydrothermal technology is discussed for the hydrolysis of carbohydrate fraction.•A cascade process sequence allows the revalorization of wheat bran in multi-produ...

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Bibliographic Details
Published in:The Journal of supercritical fluids 2018-03, Vol.133, p.603-614
Main Author: Alonso, E.
Format: Article
Language:English
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Summary:•Fractionation and hydrolysis of wheat bran using pressurized fluids are revised.•Wheat bran is analyzed as a biorefinery feedstock.•The hydrothermal technology is discussed for the hydrolysis of carbohydrate fraction.•A cascade process sequence allows the revalorization of wheat bran in multi-products. [Display omitted] Wheat bran is a very interesting feedstock for lignocellulosic biorefineries. The recovery of proteins, oil and phytochemicals can be integrated with the fractionation of polysaccharides and lignin, adding value to a multi-product biorefinery concept. After reviewing the work previously reported in the literature concerning the use of sc-CO2 and subcritical and supercritical water, the present manuscript proposes a sequential cascade process to obtain most of the valuable components of wheat bran. Six sequential steps are proposed: (1) De-fatting with sc-CO2 at 30MPa and 70°C, (2) Phenolic lipids recovery with sc-CO2 at 40MPa and 80°C, (3) De-starching assisted with ultrasounds, using water at 55°C for 7min, (4) Protein and lignin recovery with NaOH at 80°C and pH=9.3, (5) Recovery of xylose and arabinose with Hot Compressed Water assisted with RuCl3/MCM48 catalyst at 180°C and (5) ultrafast hydrolysis of cellulose with supercritical water.
ISSN:0896-8446
1872-8162
DOI:10.1016/j.supflu.2017.09.010