title: A novel cleaning process for industrial production of xylose in pilot scale from corncob by using screw-steam-explosive extruder.
abstract: Steam explosion is the most promising technology to replace conventional acid hydrolysis of lignocellulose for biomass pretreatment. In this paper, a new screw-steam-explosive extruder was designed and explored for xylose production and lignocellulose biorefinery at the pilot scale. We investigated the effect of different chemicals on xylose yield in the screw-steam-explosive extrusion process, and the xylose production process was optimized as followings: After pre-impregnation with sulfuric acid at 80 °C for 3 h, corncob was treated at 1.55 MPa with 9 mg sulfuric acid/g dry corncob (DC) for 5.5 min, followed by countercurrent extraction (3 recycles), decoloration (activated carbon dosage 0.07 g/g sugar, 75 °C for 40 min), and ion exchange (2 batches). Using this process, 3.575 kg of crystal xylose was produced from 22 kg corncob, almost 90 % of hemicellulose was released as monomeric sugar, and only a small amount of by-products was released (formic acid, acetic acid, fural, 5-hydroxymethylfurfural, and phenolic compounds were 0.17, 1.14, 0.53, 0.19, and 1.75 g/100 g DC, respectively). All results indicated that the screw-steam-explosive extrusion provides a more effective way to convert hemicellulose into xylose and could be an alternative method to traditional sulfuric acid hydrolysis process for lignocellulose biorefinery.
authors.affiliation: College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, China.
authors.forename: Hong-Jia
authors.initials: HJ
authors.lastname: Zhang
authors.forename: Xiao-Guang
authors.initials: XG
authors.lastname: Fan
authors.forename: Xue-Liang
authors.initials: XL
authors.lastname: Qiu
authors.forename: Qiu-Xiang
authors.initials: QX
authors.lastname: Zhang
authors.forename: Wen-Ya
authors.initials: WY
authors.lastname: Wang
authors.forename: Shuang-Xi
authors.initials: SX
authors.lastname: Li
authors.forename: Li-Hong
authors.initials: LH
authors.lastname: Deng
authors.forename: Mattheos A G
authors.initials: MA
authors.lastname: Koffas
authors.forename: Dong-Sheng
authors.initials: DS
authors.lastname: Wei
authors.forename: Qi-Peng
authors.initials: QP
authors.lastname: Yuan
mesh_terms: D018533:Biomass; D001709:Biotechnology / Q000379:methods*; D002244:Carbon / Q000737:chemistry; D003460:Crystallization; D004867:Equipment Design; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D007220:Industrial Waste; D007477:Ions; D008031:Lignin / Q000737:chemistry; D019800:Phenol / Q000737:chemistry; D011134:Polysaccharides / Q000737:chemistry; D011312:Pressure; D013227:Steam; D013464:Sulfuric Acids / Q000737:chemistry; D013696:Temperature; D013997:Time Factors; D062065:Wastewater; D014994:Xylose / Q000737:chemistry*; D003313:Zea mays / Q000737:chemistry*
chemical_list: D002244:Carbon; D007220:Industrial Waste; D007477:Ions; D008031:Lignin; D019800:Phenol; D011134:Polysaccharides; D013227:Steam; D013464:Sulfuric Acids; D062065:Wastewater; D014994:Xylose; C036909:lignocellulose; C007916:hemicellulose; C033158:sulfuric acid