Production and recovery of monosaccharides from lignocellulose hot water extracts in a pulp mill biorefinery.
Processing of hemicelluloses obtained with pressurized hot water extraction (PHWE) from Scots pine to monosaccharides and other chemicals was investigated experimentally. A process scheme consisting of ultrafiltration, acid hydrolysis, and chromatographic separation was proposed and evaluated. A two-stage ultrafiltration was found necessary for efficient fractionation of the wood extract. It was shown that the monosaccharides can be released from a concentrated hemicellulose fraction with sulfuric acid hydrolysis without a significant loss of yield due to decomposition of monosaccharides. Acid hydrolysate was successfully fractionated with ion exchange chromatography and the hydrolysis acid was recovered for reuse. The product fractions obtained include polyphenols and high molar mass hemicelluloses (from UF stage 1), arabinose (from UF stage 2), as well as acetic acid and a mixture of monosaccharides (xylose, galactose, mannose, glucose) from chromatography.
Lappeenranta University of Technology, Department of Chemical Technology, Skinnarilankatu 34, FIN-53850 Lappeenranta, Finland. tuomo.sainio@lut.fi
Tuomo
T
Sainio
Mari
M
Kallioinen
Olli
O
Nakari
Mika
M
Mänttäri
D001709:Biotechnology / Q000379:methods*; D005591:Chemical Fractionation; D002852:Chromatography, Ion Exchange; D005285:Fermentation / Q000187:drug effects; D006358:Hot Temperature; D006868:Hydrolysis / Q000187:drug effects; D008031:Lignin / Q000378:metabolism*; D008567:Membranes, Artificial; D009005:Monosaccharides / Q000378:metabolism*; D010865:Pilot Projects; D041605:Pinus sylvestris / Q000187:drug effects / Q000378:metabolism*; D011134:Polysaccharides / Q000378:metabolism; D013464:Sulfuric Acids / Q000494:pharmacology; D014867:Water / Q000494:pharmacology*
D008567:Membranes, Artificial; D009005:Monosaccharides; D011134:Polysaccharides; D013464:Sulfuric Acids; D014867:Water; C036909:lignocellulose; C007916:hemicellulose; D008031:Lignin; C033158:sulfuric acid