Pilot-Plant Scale 12 kW Microwave Irradiation Reactor for Woody Biomass Pretreatment

Hasegawa, Naoki; Mitani, Tomohiko; Shinohara, Naoki; Daidai, Masakazu; Yoko, Katsura; Sego, Hisayuki; Watanabe, Takashi

doi:10.1587/transele.e97.c.986

Cited by 12 publications

(8 citation statements)

References 8 publications

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“…Better uniformity in processing temperature of the reaction could result in lower dehydration of sugars to furans and hence increase sugar yields from the microwave-assisted reactions. Up-scaling studies of microwave-assisted biomass pretreatment reactions to pilot scales have been reported showing technology applicability to commercial process [36,37]. The acid-catalyzed fractionation reactions led to disruption of the highly ordered fibrous structure and degradation of the biomass surface as shown by microscopy.…”

Section: Discussionmentioning

confidence: 99%

Fractionation of rice straw by a single-step solvothermal process: Effects of solvents, acid promoters, and microwave treatment

et al. 2015

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a b s t r a c tFractionation of lignocellulosic components is a primary step for maximizing value-added conversion of plant biomass to biofuels and chemicals. In this study, different organic solvents (methyl isobutyl keone, ethyl acetate, toluene and diethyl ether) in the ternary water/alcohol/organic solvent system and acid promoters (H 2 SO 4 , HCl, and H 3 PO 4 ) were studied on a single-step solvothermal fractionation of rice straw. Ethyl acetate was found to be a superior composite solvent to the conventional solvent MIBK by providing higher glucan and lignin yields. Glucan and xylan could be further solubilized and lignin recovery increased at higher temperature and acid concentration. The optimal fractionation conditions were found to be water/ethanol/ethyl acetate (62.5%:25%:12.5%) mixture using 0.05 M H 2 SO 4 at 160 C for 1 h, which gave cellulose-enriched solid with 71.4 wt% glucan yield. Hemicellulose (53.2 wt%) was obtained as sugars, and dehydration products in the aqueous/alcohol phase were minimal. 63.1 wt% lignin was recovered in the organic solvent phase with no cross-contamination of sugars. Microwaveassisted heating at 300 W, corresponded to the temperature of 160 C for 1 h resulted in comparable glucan and lignin yields in the respective phases to conventional heating with the advantages of increased pentose yield and lower furan formation in the aqueous phase.

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Section: Discussionmentioning

confidence: 99%

Fractionation of rice straw by a single-step solvothermal process: Effects of solvents, acid promoters, and microwave treatment

et al. 2015

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“…The pretreatment of E. globulus for preparation of the adsorbents was conducted using a tower-shaped 2.45 GHz microwave (MW) reactor equipped with eight sets of 1.5 kW magnetrons and a 50 L reaction vessel (Japan Chemical Engineering & Machinery Co. Ltd., Shiga, Japan) . Wood powder of E.…”

Section: Methodsmentioning

confidence: 99%

Self-Sufficient Bioethanol Production System Using a Lignin-Derived Adsorbent of Fermentation Inhibitors

Yoshioka

Daidai²,

Matsumoto

et al. 2018

ACS Sustainable Chem. Eng.

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We have developed a new self-sufficient bioethanol producing system that suppresses the inhibition of fermentation by thermally processed residual lignin in a separate hydrolysis and fermentation (SHF) and one-pot simultaneous saccharification and cofermentation (SSCF). The new fermentation process incorporates detoxification with the lignin-derived adsorbent; thus, needs no purchased adsorbent, produces no waste adsorbent and relieves wastewater treatment load. Eucalyptus globulus wood was pretreated by microwave (MW)-assisted hydrothermolysis in aqueous maleic acid and separated into soluble and insoluble fractions. The insoluble fraction was hydrolyzed with cellulolytic enzymes, and the residual lignin was separated. We found that thermal processing of the lignin under a normoxic atmosphere efficiently adsorbed fermentation inhibitors without affecting monosaccharide concentration by enzymatic saccharification. The processing was achieved at 250–350 °C, which are much lower temperatures for wood charcoal production and resulted in higher yields of the adsorbent. The residual lignin formed after SSCF was also converted to the selective adsorbent. Using the lignin-derived adsorbent and genetically engineered Zymomonas mobiliz, bioethanol was produced at 54 g/L from the pretreated biomass mash by one-pot SSCF processes coupled with prehydrolysis. The lignin-derived adsorbent is recyclable and potentially applicable to a wide range of fermentation processes of lignocellulosics.

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“…As examples of scaled-up microwave systems, three continuous flow-type reactors with total microwave power of 3.6, 12 and 15 kW were developed for the pretreatment process of wood biomass 4),49), 50) . 5 show photographs of the 3.6 kW and 15 kW microwave pretreatment reactors, respectively 49) .…”

Section: Continuous Flow-type Microwave Reactors For Pretreatment mentioning

confidence: 99%

“…The diameters of the reactors (metal pipes) are 75 mm and 80 mm for the 3.6 kW and 15 kW reactors, respectively. Figure 6 shows a photograph of the tower-type 12 kW microwave pretreatment reactor 50) . Unlike the previous two reactors, the slurry is poured from the top of the reactor and the products exit from the bottom.…”

Section: Continuous Flow-type Microwave Reactors For Pretreatment mentioning

confidence: 99%

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Recent Progress on Microwave Processing of Biomass for Bioenergy Production

Mitani

2018

J. Jpn. Petrol. Inst.

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Recent studies on microwave processing of biomass for bioenergy production are reviewed. Statistical review of published research papers related to microwave and biomass was used to classify microwave processing used in bioenergy production. Microwaves have potential for use in various processing methods such as pretreatment, gasification, pyrolysis, transesterification, extraction, liquefaction and drying, to achieve low energy consumption, rapid reaction time, and high production yield. Microwave-assisted processing technologies for the second generation biomass (lignocellulosic biomass) and third generation biomass (algae and seaweeds) are described, as first generation biomass (food crops such as sugar canes, corns and grains) is often discussed as a "fuel versus food" issue. Scale-up strategies and discussions on energy consumption, cost, and efficiency of the microwave processing are also described with reference to specific examples of microwave reactors. Understanding of dielectric properties of biomass mixture is crucially important for designing an efficient and robust microwave reactor. Microwave processing is a future promising technology for renewable energy production, although its industrialization is still unfulfilled.

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Pilot-Plant Scale 12 kW Microwave Irradiation Reactor for Woody Biomass Pretreatment

Cited by 12 publications

References 8 publications

Fractionation of rice straw by a single-step solvothermal process: Effects of solvents, acid promoters, and microwave treatment

Fractionation of rice straw by a single-step solvothermal process: Effects of solvents, acid promoters, and microwave treatment

Self-Sufficient Bioethanol Production System Using a Lignin-Derived Adsorbent of Fermentation Inhibitors

Recent Progress on Microwave Processing of Biomass for Bioenergy Production

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