title: Effects of Kraft lignin on hydrolysis/dehydration of sugars, cellulosic and lignocellulosic biomass under hot compressed water.
abstract: The effect of Kraft lignin presenting on the hydrolysis and dehydration of C5 and C6 sugars, cellulose, hemicelluloses and biomass under hot compressed water (HCW) in the presence of H3PO4 catalyst was intensively studied. The lignin strongly inhibited the acid hydrolysis of cellulose and hemicellulose to glucose and xylose, respectively. Interestingly, the admixed lignin markedly promoted the isomerization of glucose to fructose, and dehydration of fructose (except at the low catalyst loading), resulting in high 5-hydroxymethylfurfural yields. Nonetheless, lignin inhibited the hydrolysis of xylan to xylose and dehydration of xylose to furfural. Moreover, the acidity of the system significantly affects the hydrolysis/dehydration of biomass. It was revealed that the presence of lignin strongly interfered the yields of sugars and furans produced from raw corncob, while the delignified corncob provided significant improvement of product yields, confirming the observed role of lignin in the biomass conversion system via sugar platforms.
authors.affiliation: National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA), Khlong Laung, Pathumthani 12120, Thailand.
authors.forename: Pornlada
authors.initials: P
authors.lastname: Daorattanachai
authors.forename: Nawin
authors.initials: N
authors.lastname: Viriya-empikul
authors.forename: Navadol
authors.initials: N
authors.lastname: Laosiripojana
authors.forename: Kajornsak
authors.initials: K
authors.lastname: Faungnawakij
mesh_terms: D018533:Biomass; D002384:Catalysis / Q000187:drug effects; D002482:Cellulose / Q000378:metabolism*; D003890:Desiccation; D005662:Furaldehyde / Q000031:analogs & derivatives / Q000378:metabolism; D006358:Hot Temperature; D006868:Hydrolysis / Q000187:drug effects; D008031:Lignin / Q000378:metabolism* / Q000494:pharmacology*; D010756:Phosphoric Acids / Q000494:pharmacology; D014867:Water / Q000494:pharmacology*; D014990:Xylans / Q000378:metabolism; D003313:Zea mays / Q000737:chemistry
chemical_list: D010756:Phosphoric Acids; D014990:Xylans; D014867:Water; C036909:lignocellulose; C008046:5-hydroxymethylfurfural; C076151:Kraft lignin; D002482:Cellulose; D008031:Lignin; D005662:Furaldehyde; C030242:phosphoric acid
keywords: Furan compounds; Hot compressed water; Kraft lignin; Lignocellulosic biomass; Sugar