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Steam explosion pretreatment used to remove hemicellulose to enhance the production of a eucalyptus organosolv dissolving pulp |
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| Authors: | Daniela?Correia?Martino author-information" > author-information__contact u-icon-before" > mailto:danimartinodcm@gmail.com" title=" danimartinodcm@gmail.com" itemprop=" email" data-track=" click" data-track-action=" Email author" data-track-label=" " >Email author,Jorge?Luiz?Colodette,Richard?Chandra,Jack?Saddler |
| Affiliation: | 1.Pulp and Paper Laboratory, Department of Forest Engineering,Federal University of Vi?osa,Vi?osa,Brazil;2.Forest Products Biotechnology/Bioenergy Group, Faculty of Forestry,University of British Columbia,Vancouver,Canada |
| Abstract: | The steam explosion (SE) pretreatment associated with the organosolv process was investigated to produce dissolving pulp from eucalyptus. Prehydrolysis Kraft (PHK) pulping was also done to produce viscose and acetate grade pulps as reference. The organosolv pulps were delignified in two steps with sodium chlorite. Viscose and acetate grade PHK pulps were bleached by OD0(EH)D1P and OD0(EP)D1PCCE sequences, respectively. Dilute acid-catalyzed (with acid addition) SE pretreatment dissolved more xylan than auto-catalyzed (no acid addition) SE pretreatment. Steam-exploded unbleached organosolv pulps showed lower residual lignin content and screened yield than unbleached organosolv pulps without SE pretreatment. Steam explosion pretreatment helped to decrease lignin content and damaged fiber length of unbleached organosolv pulps. The 1.0% H2SO4 organosolv pulp (organosolv dissolving pulp at bioconversion conditions) showed the highest reactivity. Even showing low viscosity for some applications, in general, the organosolv dissolving pulps produced in this study can be used for making lyocell fibers. |
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