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Please use this identifier to cite or link to this item: http://hdl.handle.net/10277/630

Authors: Gandolfi, Stefano
Internal Tutor: POLLEGIONI, LOREDANO
Title: Hemp hurds biorefining for chemicals productions. Chemical characterization, organosolv fractionation and enzymatic depredation for sugars exploitation
Abstract: Lignocellulosic biomass has been highlighted to be a sustainable and renewable feedstock for fossil source replacement. As in the petroleum refinery, the challenges are in making the cellulose fraction accessible to enzymes during enzymatic hydrolysis and maximizing the utilization of all the constituents within the feedstock. In a biorefinery facility the fermentation of the saccharidic fraction to liquid fuels or chemicals provide the gross value, whereas the valorization of the others constituents help to make the process economically viable. In this work the effective fractionation of hemp hurds (HH) into its three main components, cellulose, hemicellulose, and lignin, has been obtained by means of an organosolv pretreatment step followed by enzymatic hydrolysis of the pretreated HH. The effect of different process variables and the kinetic of enzymatic hydrolysis have been studied; the two steps were optimized to yield the highest amounts of fermentable monomeric xylose (from hemicellulose, C5) and glucose (from cellulose, C6). The aptness of C5 and C6 streams has been evaluated, in a fermentation process, by producing butanol and lactic acid, two of the most valuable platform chemicals for biorefinery. In particular, 42 g of polymer-grade lactic acid has been obtained from 100 g of raw HH. These results can be considered promising for HH valorization through the biorefinery concept.
Keywords: missing
Subject MIUR : BIO/10 BIOCHIMICA
Issue Date: 2015
Language: eng
Doctoral course: Biotecnologie
Academic cycle: 28
Publisher: Università degli Studi dell'Insubria
Other information: Istituto di Chimica del Riconoscimento Molecolare - Consiglio Nazionale delle Ricerche (ICRM-CNR)- Milano.
Citation: Gandolfi, S.Hemp hurds biorefining for chemicals productions. Chemical characterization, organosolv fractionation and enzymatic depredation for sugars exploitation (Doctoral Thesis, Università degli Studi dell'Insubria, 2015).

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Phd_Thesis_Gandolfistefano_part1.pdftesto tesi parte 14,28 MBAdobe PDFView/Open
Phd_Thesis_Gandolfistefano_part2.pdftesto tesi parte 2296,7 kBAdobe PDFView/Open
Phd_Thesis_Gandolfistefano_part3.pdftesto tesi parte 3629,9 kBAdobe PDFView/Open
Phd_Thesis_Gandolfistefano_articolo_ChemSusChem.pdfarticolo ChemSusChem1,89 MBAdobe PDFNot available View/Open
Phd_Thesis_Gandolfistefano_articolo_BioresTechnol.pdfarticolo Biores Technol375,79 kBAdobe PDFNot available View/Open


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