Hydrothermal upgrading of biomass to biofuel; studies on some monosaccharide model compounds.
During the hydrothermal upgrading of biomass, hydrolysis to glucose is an important step. To elucidate some of the reaction pathways that follow this initial hydrolysis, the hydrothermal treatment (340 degrees C, 27.5 MPa, 25-204 s) of dilute (50 mM) solutions of D-glucose and some other monosaccharides were studied. As a result of the increase of Kw under subcritical conditions, both acid and base catalysed reactions occur. The acid catalysed reactions are mainly dehydrations leading initially to 5-hydroxymethylfurfural. Important base catalysed reactions result in glycolaldehyde and glyceraldehyde. Further fragmentations and dehydrations lead to a variety of low molecular weight compounds such as formic acid, acetic acid, lactic acid, acrylic acid, 2-furaldehyde and 1,2,4-benzenetriol. Important pathways leading to a decrease of the O-content of the liquid reaction products start from the intermediate glyceraldehyde, which forms pyruvaldehyde, which in its turn is converted into formic acid and acetaldehyde. The latter compound can also be formed via isomerisation of glyceraldehyde into lactic acid followed by decarbonylation.
Srokol
Zbigniew
Z
Laboratory for Applied Organic Chemistry and Catalysis, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands.
Bouche
Anne-Gaëlle
AG
van Estrik
Anton
A
Strik
Rob C J
RC
Maschmeyer
Thomas
T
Peters
Joop A
JA
D000079:Acetaldehyde / Q000031:analogs & derivatives* / Q000737:chemistry; D019342:Acetic Acid / Q000737:chemistry; D000179:Acrylates / Q000737:chemistry; D018533:Biomass; D001709:Biotechnology / Q000379:methods*; D002244:Carbon / Q000737:chemistry; D002384:Catalysis; D002851:Chromatography, High Pressure Liquid; D004736:Energy-Generating Resources; D005561:Formates / Q000737:chemistry; D005662:Furaldehyde / Q000737:chemistry; D005663:Furans / Q000737:chemistry; D005947:Glucose / Q000737:chemistry; D005985:Glyceraldehyde / Q000737:chemistry; D006358:Hot Temperature; D006868:Hydrolysis; D006873:Hydroquinones / Q000737:chemistry; D007700:Kinetics; D019344:Lactic Acid / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D008956:Models, Chemical; D009005:Monosaccharides / Q000737:chemistry; D011312:Pressure; D013696:Temperature; D013780:Tetroses / Q000737:chemistry; D013997:Time Factors
D000179:Acrylates; D005561:Formates; D005663:Furans; D006873:Hydroquinones; D009005:Monosaccharides; D013780:Tetroses; C030544:formic acid; C013038:hydroxyhydroquinone; D019344:Lactic Acid; D005985:Glyceraldehyde; D002244:Carbon; D005662:Furaldehyde; D000079:Acetaldehyde; D005947:Glucose; C036658:acrylic acid; D019342:Acetic Acid; C039281:furan; C010972:glycolaldehyde; C073321:erythrose