Produção de ácido levulínico por meio de hidrólise ácida da casca de arroz
Ano de defesa: | 2010 |
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Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | , |
Tipo de documento: | Dissertação |
Tipo de acesso: | Acesso aberto |
Idioma: | por |
Instituição de defesa: |
Universidade Federal de Santa Maria
|
Programa de Pós-Graduação: |
Programa de Pós-Graduação em Química
|
Departamento: |
Química
|
País: |
BR
|
Palavras-chave em Português: | |
Palavras-chave em Inglês: | |
Área do conhecimento CNPq: | |
Link de acesso: | http://repositorio.ufsm.br/handle/1/10465 |
Resumo: | The beginning of the 21st century has been characterized by a great interest about the use of renewable raw materials for the production of industrial feedstocks and technological products. This trend is followed by the concern about the huge amount of waste generated by the always increasing agricultural production. In this sense, the reuse of the residual rice husks (RH) of the rice production, which by inadequate management affects negatively the environment in several ways, can constitute an environmental solution and a source of income. In this work, it was used RH as a source of cellulose for the production of levulinic acid (AL), a versatile chemical intermediate with many industrial applications, produced usually via chemical synthesis. The cellulose hydrolysis in acidic medium releases glucose monomers, which by heating under pressure dehydrate and form the intermediary 5-hydroxymethyl-2-furfural (5-HMF) - that, in turn, degraded generating AL. For the AL production, a 1.00 g of RH previously comminuted, selected, washed and dried in an oven, was hydrolyzed with 10.0 mL of HCl 4.5% (v/v) or 4% H2SO4 (v/v) in a batch reactor under pressure (51 to 62 atm). The concentration of AL, as well as of 5-HMF, present in the acidic hydrolysate, were analyzed by HPLC-UV. The solid residue of the hydrolysis was characterized by SEM and FTIR. In order to evaluate the effect of the variables temperature, pressure and hydrolysis time on the yield of the process of AL production, two factorial designs were performed: one, for the process using HCl, and another for the process using H2SO4, keeping constant the mass of RH and the used acid volume. After optimization of the time, pressure and temperature of hydrolysis, it was studied the effects of the acid concentration and of the RH pre-treatment on the production of AL. It was investigated, therefore, the pre-treatment with hydrogen peroxide, sodium hypochlorite, oxalic acid, Soxhlet extraction in aqueous medium and Soxhlet extraction with a mixture of benzene-ethanol 1:1 (v/v). It was verified that the AL production is maximum when the hydrolytic process was carried out at temperatures 160 °C, under pressure of 53 atm and reaction time of 70 min. The best catalyst for the process was hydrochloric acid at a concentration of 4.5% (v/v). Among the pre-treatments applied to the RH, the Soxhlet aqueous extraction provided the best yield of AL (59.4%, w/w). |
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2017-05-122017-05-122010-02-08BEVILAQUA, Daiane Balconi. Acids production by means of acid hydrolysis of rice husk. 2010. 87 f. Dissertação (Mestrado em Química) - Universidade Federal de Santa Maria, Santa Maria, 2010.http://repositorio.ufsm.br/handle/1/10465The beginning of the 21st century has been characterized by a great interest about the use of renewable raw materials for the production of industrial feedstocks and technological products. This trend is followed by the concern about the huge amount of waste generated by the always increasing agricultural production. In this sense, the reuse of the residual rice husks (RH) of the rice production, which by inadequate management affects negatively the environment in several ways, can constitute an environmental solution and a source of income. In this work, it was used RH as a source of cellulose for the production of levulinic acid (AL), a versatile chemical intermediate with many industrial applications, produced usually via chemical synthesis. The cellulose hydrolysis in acidic medium releases glucose monomers, which by heating under pressure dehydrate and form the intermediary 5-hydroxymethyl-2-furfural (5-HMF) - that, in turn, degraded generating AL. For the AL production, a 1.00 g of RH previously comminuted, selected, washed and dried in an oven, was hydrolyzed with 10.0 mL of HCl 4.5% (v/v) or 4% H2SO4 (v/v) in a batch reactor under pressure (51 to 62 atm). The concentration of AL, as well as of 5-HMF, present in the acidic hydrolysate, were analyzed by HPLC-UV. The solid residue of the hydrolysis was characterized by SEM and FTIR. In order to evaluate the effect of the variables temperature, pressure and hydrolysis time on the yield of the process of AL production, two factorial designs were performed: one, for the process using HCl, and another for the process using H2SO4, keeping constant the mass of RH and the used acid volume. After optimization of the time, pressure and temperature of hydrolysis, it was studied the effects of the acid concentration and of the RH pre-treatment on the production of AL. It was investigated, therefore, the pre-treatment with hydrogen peroxide, sodium hypochlorite, oxalic acid, Soxhlet extraction in aqueous medium and Soxhlet extraction with a mixture of benzene-ethanol 1:1 (v/v). It was verified that the AL production is maximum when the hydrolytic process was carried out at temperatures 160 °C, under pressure of 53 atm and reaction time of 70 min. The best catalyst for the process was hydrochloric acid at a concentration of 4.5% (v/v). Among the pre-treatments applied to the RH, the Soxhlet aqueous extraction provided the best yield of AL (59.4%, w/w).O início do século 21 tem se caracterizado por um grande interesse na utilização de matérias-primas renováveis para a produção de insumos e produtos tecnológicos. A esta tendência soma-se à preocupação com a enorme quantidade de resíduos gerada pela sempre crescente produção agrícola. Neste sentido, o aproveitamento das cascas residuais da produção de arroz (CA) - cuja disposição inadequada leva a prejuízos ao meio ambiente, de várias maneiras pode constituir uma solução ambiental e possível fonte adicional de renda. Neste trabalho utilizou-se a CA como fonte de celulose para o processo de produção de ácido levulínico (AL), intermediário químico muito versátil, com diversas aplicações industriais, produzido, em geral, via síntese química. A hidrólise da celulose em meio ácido leva à liberação de monômeros de glicose, que, por aquecimento à pressão, se desidrata e forma o intermediário 5-hidroximetil-2-furfural (5-HMF) que, por sua vez, se degrada gerando o AL. Para o processo de produção do AL, uma fração de 1,00 g de CA, previamente cominuída, selecionada, lavada e seca em estufa, foi hidrolisada com 10,0 mL de HCl 4,5% (v/v) ou de H2SO4 4% (v/v), em batelada, em reator à pressão (51 a 62 atm). A concentração de AL, bem como de 5-HMF, presente no hidrolisado ácido, foram analisadas por HPLC-UV. Já, o resíduo sólido da hidrólise foi caracterizado por meio de MEV e FTIR. Os efeitos da temperatura, pressão e tempo de hidrólise no processo de produção de AL foram avaliados através de planejamento fatorial utilizou-se metodologia de superfície resposta. Foram feitos dois planejamentos: um para o processo com HCl e outro para o processo com H2SO4, mantendo-se constantes a massa da CA e o volume de ácido utilizado. Após otimização do tempo, da pressão e da temperatura reacional, foram estudados os efeitos da concentração de ácido e do pré-tratamento inicial da CA na produção de AL. Foram investigados, assim, os prétratamentos com peróxido de hidrogênio, clorito de sódio, ácido oxálico, extração por soxhlet em meio aquoso e extração por soxhlet com mistura benzeno-etanol 1:1 (v/v). Verificou-se que a produção de AL é máxima quando o processo hidrolítico foi realizado em temperatura de 160 °C, sob pressão de 53 atm e tempo reacional de 70 min. O melhor catalisador para o processo foi o ácido clorídrico, na concentração de 4,5% (v/v). Entre os prétratamentos aplicados à biomassa, a extração aquosa da CA, em soxhlet, levou ao melhor rendimento em AL (59,4%, m/m).Coordenação de Aperfeiçoamento de Pessoal de Nível Superiorapplication/pdfporUniversidade Federal de Santa MariaPrograma de Pós-Graduação em QuímicaUFSMBRQuímicaCasca de arrozHidróliseÁcido levulínicoRice husksHydrolysisLevulinic acidCNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICAProdução de ácido levulínico por meio de hidrólise ácida da casca de arrozAcids production by means of acid hydrolysis of rice huskinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisMartins, Ayrton Figueiredohttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4787438A0Cardoso, André de Limahttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4772633A8Silveira, Djalma Dias dahttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4723875A1http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4238722A6Bevilaqua, Daiane Balconi100600000000400500500300500ade6000d-a348-4d49-a531-6500a65a153a486bc091-1e85-4d81-bbae-50f40b6604ad270fbaac-8935-4c80-aace-db715d28d65a350f856f-fa7d-44e9-9946-1d1e2ad582e2info:eu-repo/semantics/openAccessreponame:Biblioteca Digital de Teses e Dissertações do UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMORIGINALBEVILAQUA, DAIANE BALCONI.pdfapplication/pdf2857710http://repositorio.ufsm.br/bitstream/1/10465/1/BEVILAQUA%2c%20DAIANE%20BALCONI.pdf4d741d3aa3480e7719b02cb2152d854cMD51TEXTBEVILAQUA, DAIANE BALCONI.pdf.txtBEVILAQUA, DAIANE BALCONI.pdf.txtExtracted texttext/plain133533http://repositorio.ufsm.br/bitstream/1/10465/2/BEVILAQUA%2c%20DAIANE%20BALCONI.pdf.txtb9d7df7fea6d17ff3de883274668be63MD52THUMBNAILBEVILAQUA, DAIANE BALCONI.pdf.jpgBEVILAQUA, DAIANE BALCONI.pdf.jpgIM Thumbnailimage/jpeg4884http://repositorio.ufsm.br/bitstream/1/10465/3/BEVILAQUA%2c%20DAIANE%20BALCONI.pdf.jpg27a43db6f16d4923d02c1fc7fac7d4cbMD531/104652017-07-25 12:05:14.253oai:repositorio.ufsm.br:1/10465Biblioteca Digital de Teses e Dissertaçõeshttps://repositorio.ufsm.br/ONGhttps://repositorio.ufsm.br/oai/requestatendimento.sib@ufsm.br||tedebc@gmail.comopendoar:2017-07-25T15:05:14Biblioteca Digital de Teses e Dissertações do UFSM - Universidade Federal de Santa Maria (UFSM)false |
dc.title.por.fl_str_mv |
Produção de ácido levulínico por meio de hidrólise ácida da casca de arroz |
dc.title.alternative.eng.fl_str_mv |
Acids production by means of acid hydrolysis of rice husk |
title |
Produção de ácido levulínico por meio de hidrólise ácida da casca de arroz |
spellingShingle |
Produção de ácido levulínico por meio de hidrólise ácida da casca de arroz Bevilaqua, Daiane Balconi Casca de arroz Hidrólise Ácido levulínico Rice husks Hydrolysis Levulinic acid CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
title_short |
Produção de ácido levulínico por meio de hidrólise ácida da casca de arroz |
title_full |
Produção de ácido levulínico por meio de hidrólise ácida da casca de arroz |
title_fullStr |
Produção de ácido levulínico por meio de hidrólise ácida da casca de arroz |
title_full_unstemmed |
Produção de ácido levulínico por meio de hidrólise ácida da casca de arroz |
title_sort |
Produção de ácido levulínico por meio de hidrólise ácida da casca de arroz |
author |
Bevilaqua, Daiane Balconi |
author_facet |
Bevilaqua, Daiane Balconi |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Martins, Ayrton Figueiredo |
dc.contributor.advisor1Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4787438A0 |
dc.contributor.referee1.fl_str_mv |
Cardoso, André de Lima |
dc.contributor.referee1Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4772633A8 |
dc.contributor.referee2.fl_str_mv |
Silveira, Djalma Dias da |
dc.contributor.referee2Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4723875A1 |
dc.contributor.authorLattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4238722A6 |
dc.contributor.author.fl_str_mv |
Bevilaqua, Daiane Balconi |
contributor_str_mv |
Martins, Ayrton Figueiredo Cardoso, André de Lima Silveira, Djalma Dias da |
dc.subject.por.fl_str_mv |
Casca de arroz Hidrólise Ácido levulínico |
topic |
Casca de arroz Hidrólise Ácido levulínico Rice husks Hydrolysis Levulinic acid CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
dc.subject.eng.fl_str_mv |
Rice husks Hydrolysis Levulinic acid |
dc.subject.cnpq.fl_str_mv |
CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
description |
The beginning of the 21st century has been characterized by a great interest about the use of renewable raw materials for the production of industrial feedstocks and technological products. This trend is followed by the concern about the huge amount of waste generated by the always increasing agricultural production. In this sense, the reuse of the residual rice husks (RH) of the rice production, which by inadequate management affects negatively the environment in several ways, can constitute an environmental solution and a source of income. In this work, it was used RH as a source of cellulose for the production of levulinic acid (AL), a versatile chemical intermediate with many industrial applications, produced usually via chemical synthesis. The cellulose hydrolysis in acidic medium releases glucose monomers, which by heating under pressure dehydrate and form the intermediary 5-hydroxymethyl-2-furfural (5-HMF) - that, in turn, degraded generating AL. For the AL production, a 1.00 g of RH previously comminuted, selected, washed and dried in an oven, was hydrolyzed with 10.0 mL of HCl 4.5% (v/v) or 4% H2SO4 (v/v) in a batch reactor under pressure (51 to 62 atm). The concentration of AL, as well as of 5-HMF, present in the acidic hydrolysate, were analyzed by HPLC-UV. The solid residue of the hydrolysis was characterized by SEM and FTIR. In order to evaluate the effect of the variables temperature, pressure and hydrolysis time on the yield of the process of AL production, two factorial designs were performed: one, for the process using HCl, and another for the process using H2SO4, keeping constant the mass of RH and the used acid volume. After optimization of the time, pressure and temperature of hydrolysis, it was studied the effects of the acid concentration and of the RH pre-treatment on the production of AL. It was investigated, therefore, the pre-treatment with hydrogen peroxide, sodium hypochlorite, oxalic acid, Soxhlet extraction in aqueous medium and Soxhlet extraction with a mixture of benzene-ethanol 1:1 (v/v). It was verified that the AL production is maximum when the hydrolytic process was carried out at temperatures 160 °C, under pressure of 53 atm and reaction time of 70 min. The best catalyst for the process was hydrochloric acid at a concentration of 4.5% (v/v). Among the pre-treatments applied to the RH, the Soxhlet aqueous extraction provided the best yield of AL (59.4%, w/w). |
publishDate |
2010 |
dc.date.issued.fl_str_mv |
2010-02-08 |
dc.date.accessioned.fl_str_mv |
2017-05-12 |
dc.date.available.fl_str_mv |
2017-05-12 |
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masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
BEVILAQUA, Daiane Balconi. Acids production by means of acid hydrolysis of rice husk. 2010. 87 f. Dissertação (Mestrado em Química) - Universidade Federal de Santa Maria, Santa Maria, 2010. |
dc.identifier.uri.fl_str_mv |
http://repositorio.ufsm.br/handle/1/10465 |
identifier_str_mv |
BEVILAQUA, Daiane Balconi. Acids production by means of acid hydrolysis of rice husk. 2010. 87 f. Dissertação (Mestrado em Química) - Universidade Federal de Santa Maria, Santa Maria, 2010. |
url |
http://repositorio.ufsm.br/handle/1/10465 |
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UFSM |
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