Carboxymethylcellulose obtained by ethanol/water organosolv process under acid conditions

Detalhes bibliográficos
Autor(a) principal: Ruzene, Denise S.
Data de Publicação: 2007
Outros Autores: Gonçalves, A. R., Teixeira, J. A., Amorim, M. T. Pessoa de
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/1822/7744
Resumo: Sugar cane bagasse pulps were obtained by ethanol/water organosolv process under acid and alkaline conditions. The best condition of acid pulping for the sugarcane bagasse was 0.02 mol/L sulfuric acid at 160°C, for 1 h, whereas the best condition for alkaline pulping was 5% sodium hydroxide (base pulp) at 160°C, for 3 h. For the residual lignin removal, the acid and alkaline pulps were submitted to a chemical bleaching using sodium chlorite. Pulps under acid and alkaline conditions bleached with sodium chlorite presented viscosities of 3.6 and 7.8 mPa·s, respectively, and μ-kappa numbers of 1.1 and 2.4, respectively. The pulp under acid condition, bleached with sodium chlorite was used to obtain carboxymethylcellulose (CMC). CMC yield was 35% (pulp based), showing mass gain after the carboxymethylation reaction corresponding to 23.6% of substitution or 0.70 groups −CH2 COONa per unit of glucose residue. The infrared spectra showed the CMC characteristic bands and by the infrared technique it was possible to obtain a substitution degree (0.63), similar to the substitution degree calculated by mass gain (0.70).
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spelling Carboxymethylcellulose obtained by ethanol/water organosolv process under acid conditionsAcid and alkaline catalyzed ethanol pulpingCarboxymethylcelluloseChemical bleachingInfrared spectraSugarcane bagasseOrganosolv pulpingScience & TechnologySugar cane bagasse pulps were obtained by ethanol/water organosolv process under acid and alkaline conditions. The best condition of acid pulping for the sugarcane bagasse was 0.02 mol/L sulfuric acid at 160°C, for 1 h, whereas the best condition for alkaline pulping was 5% sodium hydroxide (base pulp) at 160°C, for 3 h. For the residual lignin removal, the acid and alkaline pulps were submitted to a chemical bleaching using sodium chlorite. Pulps under acid and alkaline conditions bleached with sodium chlorite presented viscosities of 3.6 and 7.8 mPa·s, respectively, and μ-kappa numbers of 1.1 and 2.4, respectively. The pulp under acid condition, bleached with sodium chlorite was used to obtain carboxymethylcellulose (CMC). CMC yield was 35% (pulp based), showing mass gain after the carboxymethylation reaction corresponding to 23.6% of substitution or 0.70 groups −CH2 COONa per unit of glucose residue. The infrared spectra showed the CMC characteristic bands and by the infrared technique it was possible to obtain a substitution degree (0.63), similar to the substitution degree calculated by mass gain (0.70).Fundação de Amparo à Pesquisa do Estado Científico e Tecnológico (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Humana PressUniversidade do MinhoRuzene, Denise S.Gonçalves, A. R.Teixeira, J. A.Amorim, M. T. Pessoa de2007-042007-04-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/7744eng"Applied Biochemistry and Biotechnology". ISSN 0273-2289. 137-140:1-12 (Apr. 2007) 573-582.0273-228910.1007/s12010-007-9080-018478417info: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:RCAAP2023-07-21T12:17:34Zoai:repositorium.sdum.uminho.pt:1822/7744Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:10:14.105748Repositório 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 Carboxymethylcellulose obtained by ethanol/water organosolv process under acid conditions
title Carboxymethylcellulose obtained by ethanol/water organosolv process under acid conditions
spellingShingle Carboxymethylcellulose obtained by ethanol/water organosolv process under acid conditions
Ruzene, Denise S.
Acid and alkaline catalyzed ethanol pulping
Carboxymethylcellulose
Chemical bleaching
Infrared spectra
Sugarcane bagasse
Organosolv pulping
Science & Technology
title_short Carboxymethylcellulose obtained by ethanol/water organosolv process under acid conditions
title_full Carboxymethylcellulose obtained by ethanol/water organosolv process under acid conditions
title_fullStr Carboxymethylcellulose obtained by ethanol/water organosolv process under acid conditions
title_full_unstemmed Carboxymethylcellulose obtained by ethanol/water organosolv process under acid conditions
title_sort Carboxymethylcellulose obtained by ethanol/water organosolv process under acid conditions
author Ruzene, Denise S.
author_facet Ruzene, Denise S.
Gonçalves, A. R.
Teixeira, J. A.
Amorim, M. T. Pessoa de
author_role author
author2 Gonçalves, A. R.
Teixeira, J. A.
Amorim, M. T. Pessoa de
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidade do Minho
dc.contributor.author.fl_str_mv Ruzene, Denise S.
Gonçalves, A. R.
Teixeira, J. A.
Amorim, M. T. Pessoa de
dc.subject.por.fl_str_mv Acid and alkaline catalyzed ethanol pulping
Carboxymethylcellulose
Chemical bleaching
Infrared spectra
Sugarcane bagasse
Organosolv pulping
Science & Technology
topic Acid and alkaline catalyzed ethanol pulping
Carboxymethylcellulose
Chemical bleaching
Infrared spectra
Sugarcane bagasse
Organosolv pulping
Science & Technology
description Sugar cane bagasse pulps were obtained by ethanol/water organosolv process under acid and alkaline conditions. The best condition of acid pulping for the sugarcane bagasse was 0.02 mol/L sulfuric acid at 160°C, for 1 h, whereas the best condition for alkaline pulping was 5% sodium hydroxide (base pulp) at 160°C, for 3 h. For the residual lignin removal, the acid and alkaline pulps were submitted to a chemical bleaching using sodium chlorite. Pulps under acid and alkaline conditions bleached with sodium chlorite presented viscosities of 3.6 and 7.8 mPa·s, respectively, and μ-kappa numbers of 1.1 and 2.4, respectively. The pulp under acid condition, bleached with sodium chlorite was used to obtain carboxymethylcellulose (CMC). CMC yield was 35% (pulp based), showing mass gain after the carboxymethylation reaction corresponding to 23.6% of substitution or 0.70 groups −CH2 COONa per unit of glucose residue. The infrared spectra showed the CMC characteristic bands and by the infrared technique it was possible to obtain a substitution degree (0.63), similar to the substitution degree calculated by mass gain (0.70).
publishDate 2007
dc.date.none.fl_str_mv 2007-04
2007-04-01T00:00:00Z
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/1822/7744
url http://hdl.handle.net/1822/7744
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv "Applied Biochemistry and Biotechnology". ISSN 0273-2289. 137-140:1-12 (Apr. 2007) 573-582.
0273-2289
10.1007/s12010-007-9080-0
18478417
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 Humana Press
publisher.none.fl_str_mv Humana Press
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
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