Transformations of glucuronoxylan during acid sulphite pulping of eucalyptus dissolving pulp
Autor(a) principal: | |
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Data de Publicação: | 2023 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10773/40612 |
Resumo: | Xylan is the main contaminant of hardwood sulphite dissolving pulp used for the production of regenerated cellulose. The amount of xylan in pulp should not exceed the minimum allowable values and which is not easy to achieve. To control the pulping process, a basic knowledge of xylan removal is essential. In this study, Eucalyptus globulus glucuronoxylan (GX) conversion during acidic Mg-base acid sulphite pulping of dissolving pulp was assessed for the frst time in pilot experiments simulating the industrial process. The kinetics of GX degradation and changes in its structure and molecular weight along all pulping steps were evaluated. According to pentosans analysis, more than 60% of wood xylan was removed already in the heating-up step. A pseudofrst-order reaction for xylan degradation at the fnal pulping temperature of 140–148 °C was obtained with an activation energy of 133.4 kJ/mol. Removal of residual GX from pulp was hampered by its entrapment in cellulose fbril aggregates. The dynamics of xylan deacetylation and depolymerization during pulping in isolated samples was revealed by 2D NMR and SEC techniques, respectively. Overall, the residual xylan structure in pulp is predetermined by its structural heterogeneity in the cell wall, rather than by structural changes occurring during pulping. |
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Transformations of glucuronoxylan during acid sulphite pulping of eucalyptus dissolving pulpAcid sulphite processDissolving pulpGlucuronoxylanHydrolysis kineticsNuclear magnetic resonance (NMR)Size exclusion chromatography (SEC)Xylan is the main contaminant of hardwood sulphite dissolving pulp used for the production of regenerated cellulose. The amount of xylan in pulp should not exceed the minimum allowable values and which is not easy to achieve. To control the pulping process, a basic knowledge of xylan removal is essential. In this study, Eucalyptus globulus glucuronoxylan (GX) conversion during acidic Mg-base acid sulphite pulping of dissolving pulp was assessed for the frst time in pilot experiments simulating the industrial process. The kinetics of GX degradation and changes in its structure and molecular weight along all pulping steps were evaluated. According to pentosans analysis, more than 60% of wood xylan was removed already in the heating-up step. A pseudofrst-order reaction for xylan degradation at the fnal pulping temperature of 140–148 °C was obtained with an activation energy of 133.4 kJ/mol. Removal of residual GX from pulp was hampered by its entrapment in cellulose fbril aggregates. The dynamics of xylan deacetylation and depolymerization during pulping in isolated samples was revealed by 2D NMR and SEC techniques, respectively. Overall, the residual xylan structure in pulp is predetermined by its structural heterogeneity in the cell wall, rather than by structural changes occurring during pulping.Springer2024-02-07T18:23:19Z2023-11-01T00:00:00Z2023-11info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10773/40612eng0969-023910.1007/s10570-023-05472-6Mendes, Inês S. F.Prates, AntónioEvtuguin, Dmitry V.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-02-22T12:19:59Zoai:ria.ua.pt:10773/40612Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:10:40.557878Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Transformations of glucuronoxylan during acid sulphite pulping of eucalyptus dissolving pulp |
title |
Transformations of glucuronoxylan during acid sulphite pulping of eucalyptus dissolving pulp |
spellingShingle |
Transformations of glucuronoxylan during acid sulphite pulping of eucalyptus dissolving pulp Mendes, Inês S. F. Acid sulphite process Dissolving pulp Glucuronoxylan Hydrolysis kinetics Nuclear magnetic resonance (NMR) Size exclusion chromatography (SEC) |
title_short |
Transformations of glucuronoxylan during acid sulphite pulping of eucalyptus dissolving pulp |
title_full |
Transformations of glucuronoxylan during acid sulphite pulping of eucalyptus dissolving pulp |
title_fullStr |
Transformations of glucuronoxylan during acid sulphite pulping of eucalyptus dissolving pulp |
title_full_unstemmed |
Transformations of glucuronoxylan during acid sulphite pulping of eucalyptus dissolving pulp |
title_sort |
Transformations of glucuronoxylan during acid sulphite pulping of eucalyptus dissolving pulp |
author |
Mendes, Inês S. F. |
author_facet |
Mendes, Inês S. F. Prates, António Evtuguin, Dmitry V. |
author_role |
author |
author2 |
Prates, António Evtuguin, Dmitry V. |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Mendes, Inês S. F. Prates, António Evtuguin, Dmitry V. |
dc.subject.por.fl_str_mv |
Acid sulphite process Dissolving pulp Glucuronoxylan Hydrolysis kinetics Nuclear magnetic resonance (NMR) Size exclusion chromatography (SEC) |
topic |
Acid sulphite process Dissolving pulp Glucuronoxylan Hydrolysis kinetics Nuclear magnetic resonance (NMR) Size exclusion chromatography (SEC) |
description |
Xylan is the main contaminant of hardwood sulphite dissolving pulp used for the production of regenerated cellulose. The amount of xylan in pulp should not exceed the minimum allowable values and which is not easy to achieve. To control the pulping process, a basic knowledge of xylan removal is essential. In this study, Eucalyptus globulus glucuronoxylan (GX) conversion during acidic Mg-base acid sulphite pulping of dissolving pulp was assessed for the frst time in pilot experiments simulating the industrial process. The kinetics of GX degradation and changes in its structure and molecular weight along all pulping steps were evaluated. According to pentosans analysis, more than 60% of wood xylan was removed already in the heating-up step. A pseudofrst-order reaction for xylan degradation at the fnal pulping temperature of 140–148 °C was obtained with an activation energy of 133.4 kJ/mol. Removal of residual GX from pulp was hampered by its entrapment in cellulose fbril aggregates. The dynamics of xylan deacetylation and depolymerization during pulping in isolated samples was revealed by 2D NMR and SEC techniques, respectively. Overall, the residual xylan structure in pulp is predetermined by its structural heterogeneity in the cell wall, rather than by structural changes occurring during pulping. |
publishDate |
2023 |
dc.date.none.fl_str_mv |
2023-11-01T00:00:00Z 2023-11 2024-02-07T18:23:19Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10773/40612 |
url |
http://hdl.handle.net/10773/40612 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
0969-0239 10.1007/s10570-023-05472-6 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Springer |
publisher.none.fl_str_mv |
Springer |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799137757287677952 |