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Cellulose dissolution in near- and supercritical water for cello-oligosaccharides production

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Tolonen, Lasse
dc.contributor.author Buffiere, Jean
dc.date.accessioned 2014-11-21T10:44:08Z
dc.date.available 2014-11-21T10:44:08Z
dc.date.issued 2014-11-11
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/14478
dc.description.abstract Water-soluble cello-oligosaccharides and water-insoluble, low molecular weight cellulose polymers can be produced by controlled cellulose depolymerization of cellulose using supercritical water treatment. The products from the hydrolysis and dissolution of microcrystalline cellulose were investigated after a treatment at temperature range of 320 to 390 degrees Celsius and residence time range of 0.1 to 0.8 seconds. Four cellulosic product fractions were identified, quantified, and characterized using gravimetric and chromatographic techniques. The four fractions consisted of solid cellulosic residue, solid cellulosic precipitate, water-soluble cello-oligosaccharides, and water-soluble degradation products. The water-insoluble, low molecular mass cellulose polymers accounted for up to 25 percent of the total products. In addition, glucose and cello-oligosaccharides of degree of polymerization up to cellodecaose accounted for up to 65 percent of the total products. Furthermore, the water-soluble fraction was significantly purified using membrane ultrafiltration. These results show that the supercritical water treatment of microcrystalline cellulose is a fast and efficient method for producing both cello-oligomers and low molecular weight cellulose precipitate, which can be integrated into a full manufacturing process using downstream separation and purification methods. en
dc.format.extent 69 + 15
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.title Cellulose dissolution in near- and supercritical water for cello-oligosaccharides production en
dc.type G2 Pro gradu, diplomityö en
dc.contributor.school Kemian tekniikan korkeakoulu fi
dc.subject.keyword supercritical water en
dc.subject.keyword cello-oligosaccharides en
dc.subject.keyword cellulose dissolution en
dc.subject.keyword cellulose hydrolysis en
dc.subject.keyword microcrystalline cellulose en
dc.identifier.urn URN:NBN:fi:aalto-201411223045
dc.programme.major Biorefineries fi
dc.programme.mcode KM3001 fi
dc.type.ontasot Master's thesis en
dc.type.ontasot Diplomityö fi
dc.contributor.supervisor Sixta, Herbert
dc.programme Master's Programme in Bioproduct Technology fi
dc.location PK fi
local.aalto.openaccess yes
local.aalto.digifolder Aalto_90679
dc.rights.accesslevel openAccess
local.aalto.idinssi 50106
dc.type.publication masterThesis
dc.type.okm G2 Pro gradu, diplomityö

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