Modification of acid hydrolysis lignin for value-added applications by micronization followed by hydrothermal alkaline treatment
Autor(a) principal: | |
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Data de Publicação: | 2015 |
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/10773/19484 |
Resumo: | Technical hydrolysis lignin (THL) was micronized by grinding in a rotary-jet mill to obtain a fraction of approximately 5 mm. Both initial and milled THLs were liquefied by thermal alkaline treatment at 220 degrees C for 2 h. Upgraded THLs that were nonmilled (L1) and milled (L2) were desalted by treatment with cation-exchanged resin and were dried. Micronization affected the course of hydrothermal alkaline treatment and the structure and composition of the obtained lignin. Thus, L2 contained much less concomitant polysaccharides and extractives than L1 and was more condensed. The molecular weights of L1 and L2 were 1100 and 1000 Da, respectively, as determined by size-exclusion chromatography. Structural characterization carried out by employing tandem electrospray ionization-mass spectrometry and 1D and 2D nuclear magnetic resonance spectroscopy revealed that small amounts of beta-O-4 (similar to 6 mol.%), beta-5, and beta-beta structures still remained in L1 and L2. Overall, upgraded lignins are oligomers (trimers--pentamers) with highly degraded propane chains and possess polyconjugated condensed aromatic structures. Upgraded THL seems to be a promising raw material for polymeric formulations. |
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Modification of acid hydrolysis lignin for value-added applications by micronization followed by hydrothermal alkaline treatmentTECHNICAL LIGNINSPRODUCTSEXTRACTIONWOODTechnical hydrolysis lignin (THL) was micronized by grinding in a rotary-jet mill to obtain a fraction of approximately 5 mm. Both initial and milled THLs were liquefied by thermal alkaline treatment at 220 degrees C for 2 h. Upgraded THLs that were nonmilled (L1) and milled (L2) were desalted by treatment with cation-exchanged resin and were dried. Micronization affected the course of hydrothermal alkaline treatment and the structure and composition of the obtained lignin. Thus, L2 contained much less concomitant polysaccharides and extractives than L1 and was more condensed. The molecular weights of L1 and L2 were 1100 and 1000 Da, respectively, as determined by size-exclusion chromatography. Structural characterization carried out by employing tandem electrospray ionization-mass spectrometry and 1D and 2D nuclear magnetic resonance spectroscopy revealed that small amounts of beta-O-4 (similar to 6 mol.%), beta-5, and beta-beta structures still remained in L1 and L2. Overall, upgraded lignins are oligomers (trimers--pentamers) with highly degraded propane chains and possess polyconjugated condensed aromatic structures. Upgraded THL seems to be a promising raw material for polymeric formulations.WALTER DE GRUYTER GMBH2017-12-07T19:14:18Z2015-01-01T00:00:00Z2015info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10773/19484eng0018-383010.1515/hf-2014-0264Krutov, Stepan M.Evtuguin, Dmitry V.Ipatova, Elena V.Santos, Sonia A. O.Sazanov, Yurii N.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:RCAAP2024-02-22T11:37:52Zoai:ria.ua.pt:10773/19484Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T02:54:15.856655Repositório 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 |
Modification of acid hydrolysis lignin for value-added applications by micronization followed by hydrothermal alkaline treatment |
title |
Modification of acid hydrolysis lignin for value-added applications by micronization followed by hydrothermal alkaline treatment |
spellingShingle |
Modification of acid hydrolysis lignin for value-added applications by micronization followed by hydrothermal alkaline treatment Krutov, Stepan M. TECHNICAL LIGNINS PRODUCTS EXTRACTION WOOD |
title_short |
Modification of acid hydrolysis lignin for value-added applications by micronization followed by hydrothermal alkaline treatment |
title_full |
Modification of acid hydrolysis lignin for value-added applications by micronization followed by hydrothermal alkaline treatment |
title_fullStr |
Modification of acid hydrolysis lignin for value-added applications by micronization followed by hydrothermal alkaline treatment |
title_full_unstemmed |
Modification of acid hydrolysis lignin for value-added applications by micronization followed by hydrothermal alkaline treatment |
title_sort |
Modification of acid hydrolysis lignin for value-added applications by micronization followed by hydrothermal alkaline treatment |
author |
Krutov, Stepan M. |
author_facet |
Krutov, Stepan M. Evtuguin, Dmitry V. Ipatova, Elena V. Santos, Sonia A. O. Sazanov, Yurii N. |
author_role |
author |
author2 |
Evtuguin, Dmitry V. Ipatova, Elena V. Santos, Sonia A. O. Sazanov, Yurii N. |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Krutov, Stepan M. Evtuguin, Dmitry V. Ipatova, Elena V. Santos, Sonia A. O. Sazanov, Yurii N. |
dc.subject.por.fl_str_mv |
TECHNICAL LIGNINS PRODUCTS EXTRACTION WOOD |
topic |
TECHNICAL LIGNINS PRODUCTS EXTRACTION WOOD |
description |
Technical hydrolysis lignin (THL) was micronized by grinding in a rotary-jet mill to obtain a fraction of approximately 5 mm. Both initial and milled THLs were liquefied by thermal alkaline treatment at 220 degrees C for 2 h. Upgraded THLs that were nonmilled (L1) and milled (L2) were desalted by treatment with cation-exchanged resin and were dried. Micronization affected the course of hydrothermal alkaline treatment and the structure and composition of the obtained lignin. Thus, L2 contained much less concomitant polysaccharides and extractives than L1 and was more condensed. The molecular weights of L1 and L2 were 1100 and 1000 Da, respectively, as determined by size-exclusion chromatography. Structural characterization carried out by employing tandem electrospray ionization-mass spectrometry and 1D and 2D nuclear magnetic resonance spectroscopy revealed that small amounts of beta-O-4 (similar to 6 mol.%), beta-5, and beta-beta structures still remained in L1 and L2. Overall, upgraded lignins are oligomers (trimers--pentamers) with highly degraded propane chains and possess polyconjugated condensed aromatic structures. Upgraded THL seems to be a promising raw material for polymeric formulations. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-01-01T00:00:00Z 2015 2017-12-07T19:14:18Z |
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/10773/19484 |
url |
http://hdl.handle.net/10773/19484 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
0018-3830 10.1515/hf-2014-0264 |
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 |
WALTER DE GRUYTER GMBH |
publisher.none.fl_str_mv |
WALTER DE GRUYTER GMBH |
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 |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
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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1799137594588528640 |