Subcritical water hydrolysis of brewer’s spent grains: Selective production of hemicellulosic sugars (C-5 sugars)

Torres-Mayanga, Paulo César; Azambuja, Suéllen Patrícia Held; Tyufekchiev, Maksim; Tompsett, Geoffrey A.; Timko, Michaël T.; Goldbeck, Rosana; Rostagno, Maurı́cio A.; Forster‐Carneiro, Tânia

doi:10.1016/j.supflu.2018.11.019

Cited by 68 publications

(37 citation statements)

References 76 publications

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“…A large variety of materials have been tested successfully using the FBR including softwood and hardwood (Cabeza et al, 2016), straws (Liu and Wyman, 2003;Ingram et al, 2009), and other lignocellulose biomasses from agro-and food industry (Pronyk and Mazza, 2010;Torres-Mayanga et al, 2019). The particle forms tested include cut straws, wood chips, sawdust, and straw pellets.…”

Section: Semi-continuous Reactor Technology: Fixed-bed Reactor and Flmentioning

confidence: 99%

Engineering aspects of hydrothermal pretreatment: From batch to continuous operation, scale-up and pilot reactor under biorefinery concept

Ruiz

Conrad

Sun

et al. 2020

Bioresource Technology

255

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Different pretreatments strategies have been developed over the years mainly to enhance enzymatic cellulose degradation. In the new biorefinery era, a more holistic view on pretreatment is required to secure optimal use of the whole biomass. Hydrothermal pretreatment technology is regarded as very promising for lignocellulose biomass fractionation biorefinery and to be implemented at the industrial scale for biorefineries of second generation and circular bioeconomy, since it does not require no chemical inputs other than liquid water or steam and heat. This review focuses on the fundamentals of hydrothermal pretreatment, structure changes of biomass during this pretreatment, multiproduct strategies in terms of biorefinery, reactor technology and

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Section: Semi-continuous Reactor Technology: Fixed-bed Reactor and Flmentioning

confidence: 99%

Engineering aspects of hydrothermal pretreatment: From batch to continuous operation, scale-up and pilot reactor under biorefinery concept

Ruiz

Conrad

Sun

et al. 2020

Bioresource Technology

255

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“…After the reaction, the mixture was cooled to room temperature and the absorbance was measured at 540 nm. TRS was determined after acid hydrolysis with hydrochloric acid (37 % w/w) at 60 °C for 20 min and neutralized with sodium hydroxide (6 mol•L -1 ) [23]. The quantification of RS and TRS was performed using a calibration curve elaborated with glucose.…”

Section: Reducing Sugarmentioning

confidence: 99%

“…They obtained % as the maximum yield of solubilized protein at 185 ºC and phenolic recovery, while the maximum level of free amino acids was reached at 160 ºC with a value of 55 mg free amino acids/gprotein-BSG. Torres-Mayanga et al [23] studied the production of C-5 sugars from the BSG hydrolysis, varying the reaction temperature (140, 160, 180, and 210 °C), flow rate (10 and 20 mL min -1 ), and the solvent/feed ratio (S/F: 64, 80 and 112), and they obtained a maximum yield of reducing sugars of 5.84 g per 100 g of feed and the maximum total reducing sugar yield of 35.11 g per 100 g of feed, at the optimal operating conditions of 210 °C, 20 mL min -1 water flow rate, and S/F of 64. Those authors reported that arabinose was the most abundant identified sugar product, with a maximum yield of approximately 3.1 g per 100 g of feed.…”

Section: Introductionmentioning

confidence: 99%

Pressurized liquid extraction of brewer’s spent grain: Kinetics and crude extracts characterization

Herbst

Hamerski

Errico

et al. 2021

Journal of Industrial and Engineering Chemistry

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In this study, extraction yield of valuable compounds from brewer's spent grain (BSG) using pressurized liquid extraction (PLE) was investigated varying temperature, solvent type, and flow rate at a constant pressure. The results were compared with Soxhlet extractions using the total phenolic compounds (TPC), total flavonoid compounds (TFC), antioxidant activity (AA), reducing sugars (RS), and total reducing sugars (TRS) as indices. The highest PLE extraction yield was 20.1 wt%, at 120°C, 2 mL/min using ethanol to water volume ratio of 0.5, at 10 MPa. The TPC, TFC, and AA content were favored by water and water/ethanol extractions and temperature increase. The highest AA was obtained with water at 120 °C and 4 mL/min achieving 9944, 4769 and 4096 µmol TE/100 g of BSG extract, respectively. PLE was capable of present high extraction yields maintaining the RS and TRS in the BSG matrix. In addition, BSG was defatted with compressed propane before the extraction with PLE, showing that 2 compressed propane is highly efficient in recovering the lipid fraction from BSG. The results demonstrated a great potential of water and different EtOH/Water solvent ratio at pressurized conditions for obtaining bio-compounds of BSG in a crude extract with expressive biological activity.

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“…% significantly increased exothermic nature of the hydrothermal reactions above 200 ºC (Ibbett et al, 2011). HTT process has been applied in various reactor systems such as stirred batch vessel systems (Weil et al, 1998;Gomez et al, 2015), stationary flow-through systems Torres-Mayanga et al, 2019) or in continuous mode with screw systems (Heitz et al, 1991;Monschein and Nidetzky, 2016), plug flow systems (Thompson and Grethlein, 1979;Church and Wooldridge, 1981;Brennan et al, 1986), while using direct steam injection, conductive or microwave heating (Roos et al, 2009). The process can be conducted with water mainly the liquid phase, such as in stirred (Gomez et al, 2015) or unstirred batch vessels , or in single phase steam (Stephen Glen Allen et al, 2001), or in mixed liquid water and vapour phase such as in steam explosion (Brownell and Saddler, 1987;Bayer, 2007;Roos et al, 2009;.…”

Section: Fractionation Of Bsg By Hydrothermal Treatmentmentioning

confidence: 99%

Techno‐economic analysis of the valorization of brewers spent grains: production of xylitol and xylo‐oligosaccharides

Swart

Petersen

Bedzo

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND Brewers spent grains (BSG) represents ≤85% of a brewery's solid waste and common disposal to landfill is increasingly more difficult. Yet BSG is a food‐grade by‐product with potential economic valorization that can significantly improve resource efficiency and reduction in carbon emissions. This study investigated valorization of BSG through the application of novel high solids hydrothermal processing technology in a small‐scale biorefinery, annexed to a brewery. It focused on three scenarios for the production of: (A) the sugar replacement xylitol; (B) prebiotic xylo‐oligosaccharide (XOS); and (C) co‐production of xylitol and XOS. Economic assessment was conducted by comparing the capital and operating expenditure from process simulations created in Aspen Plus®. The process models developed were supplemented with experimental data to improve accuracy. RESULTS Internal rate of return (IRR) values obtained were greater than the hurdle rate of 9.7% for all scenarios when considering a conservative market price for xylitol and XOS as US$4500 t–1, yet dedicated production of XOS was economically more favourable with a minimum required selling price (MRSP) of US$2509 t–1 compared to US$4153 t–1 for xylitol. Additionally, the scenario for co‐production of xylitol and XOS achieved the lowest MRSP of US$2182 t–1. By‐products significantly contributed to 32.7%, 14.2% and 27.5% of the revenue generated in scenarios A, B and C, respectively. CONCLUSION These results provide a good platform from which to develop the cost‐effective commercial production of XOS and xylitol from BSG. © 2021 Society of Chemical Industry

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Subcritical water hydrolysis of brewer’s spent grains: Selective production of hemicellulosic sugars (C-5 sugars)

Cited by 68 publications

References 76 publications

Engineering aspects of hydrothermal pretreatment: From batch to continuous operation, scale-up and pilot reactor under biorefinery concept

Engineering aspects of hydrothermal pretreatment: From batch to continuous operation, scale-up and pilot reactor under biorefinery concept

Pressurized liquid extraction of brewer’s spent grain: Kinetics and crude extracts characterization

Techno‐economic analysis of the valorization of brewers spent grains: production of xylitol and xylo‐oligosaccharides

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