Clarificação do extrato aquoso de Stevia Rebaudiana Bertoni através de adsorção em zeólitas modificadas
Autor(a) principal: | |
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Data de Publicação: | 2000 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da Universidade Estadual de Maringá (RI-UEM) |
Texto Completo: | http://repositorio.uem.br:8080/jspui/handle/1/3715 |
Resumo: | The glicosydes, stevioside, rebaudioside A, B, C, D, E and dulcosides A and B, wichare extracted of the dry leaves of the native plant denominated Stevia rebaudiana Bertonior simply Stevia, are used as sweeteners. One of the process stages of extraction of thoseglicosides is the clarification of the aqueous extract of Stevia. The clarification is a very important stage because the visual quality of the product depends on it, for that reason there are many published works and research in progress in that area. The conventional processes of clarification has some disadvantages: it leaves toxic residues to the health, it has a high cost of implantation and maintenance, and the operational technology consumes reagentes and specialized labor which elevates cost. For this reason a simple technology that does not result in toxic residues in the final product is interesting and necessary. In the present work ionic exchanges were made with ions of calcium and barium in zeolites NaX and NaA. The effect of the contact of aqueous extract of dry leaves of Stevia rebaudiana Bertoni leaves with the CaX BaX, CaA and BaA was evaluated. The extract of Stevia that was in contact with the zeolite CaX showed the largest clarification and did not present alterations of its initial of characteristics, in terms of concentration of glicosydes and flavour. In batch tests at ambient temperature, the contact of Stevia aqueous extract and CaX zeolite provided a clarification between 70-80%, resulting in a decrease of approximately 10% CHT, the variation are not significant and of 30% Brix. Tests weremade varying the zeolite mass, to obtain the ideal mass of zeolite for the process. Similar tests were performed to evaluated the temperature effect in which the zeolite mass and the concentration of the extract were maintained constant. It was also observed that agitation is fundamental, because it decreases the process time. It was verified that the zeolite can be regenerated, allowing its use for than once; and with the regenerated zeolite, it was possible to obtain a clarification between 65-70%. After the performance on these batch tests, an experimental module consisting of a fixed bed of zeolite CaX was built. The Stevia aqueous extract was passed upwards and flow rate was controled to promote adequate contact. In the clarification of the Stevia aqueous extract, the process with zeolites has proven to be advantageous because: it has low cost (zeolite), it doesn't leave residues that can be toxic, the operational technology is of easy understanding and application and in addition, is not associated to risks to the environment. |
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Clarificação do extrato aquoso de Stevia Rebaudiana Bertoni através de adsorção em zeólitas modificadasClarification of the aqueous extract of Stevia Rebaudiana Bertoni by adsorption in modified zeolitesStevia Rebaudiana BertoniClarificação do extrato aquosoZeólitas modificadasAdsorçãoMétodo de clarificação do extratoAdsorção seletivaBrasil.EngenhariasEngenharia QuímicaThe glicosydes, stevioside, rebaudioside A, B, C, D, E and dulcosides A and B, wichare extracted of the dry leaves of the native plant denominated Stevia rebaudiana Bertonior simply Stevia, are used as sweeteners. One of the process stages of extraction of thoseglicosides is the clarification of the aqueous extract of Stevia. The clarification is a very important stage because the visual quality of the product depends on it, for that reason there are many published works and research in progress in that area. The conventional processes of clarification has some disadvantages: it leaves toxic residues to the health, it has a high cost of implantation and maintenance, and the operational technology consumes reagentes and specialized labor which elevates cost. For this reason a simple technology that does not result in toxic residues in the final product is interesting and necessary. In the present work ionic exchanges were made with ions of calcium and barium in zeolites NaX and NaA. The effect of the contact of aqueous extract of dry leaves of Stevia rebaudiana Bertoni leaves with the CaX BaX, CaA and BaA was evaluated. The extract of Stevia that was in contact with the zeolite CaX showed the largest clarification and did not present alterations of its initial of characteristics, in terms of concentration of glicosydes and flavour. In batch tests at ambient temperature, the contact of Stevia aqueous extract and CaX zeolite provided a clarification between 70-80%, resulting in a decrease of approximately 10% CHT, the variation are not significant and of 30% Brix. Tests weremade varying the zeolite mass, to obtain the ideal mass of zeolite for the process. Similar tests were performed to evaluated the temperature effect in which the zeolite mass and the concentration of the extract were maintained constant. It was also observed that agitation is fundamental, because it decreases the process time. It was verified that the zeolite can be regenerated, allowing its use for than once; and with the regenerated zeolite, it was possible to obtain a clarification between 65-70%. After the performance on these batch tests, an experimental module consisting of a fixed bed of zeolite CaX was built. The Stevia aqueous extract was passed upwards and flow rate was controled to promote adequate contact. In the clarification of the Stevia aqueous extract, the process with zeolites has proven to be advantageous because: it has low cost (zeolite), it doesn't leave residues that can be toxic, the operational technology is of easy understanding and application and in addition, is not associated to risks to the environment.Os glicosídeos, esteviosídeo, rebaudiosideo A, B, C, D, E e dulcosídeos A e B, que são extraídos das folhas da planta nativa denominada Stevia rebaudiana Bertoni ou simplesmente Stévia, são usados como edulcorantes. Uma das etapas do processo de extração desses glicosídeos é a clarificação do extrato de Stévia. A clarificação é uma etapa muito importante pois traduz a qualidade visual do produto, por isso existem muitos trabalhos publicados e pesquisas em andamento nessa área. Os processos convencionais de clarificação apresentam algumas desvantagens: deixam resíduos nocivos à saúde, possuem um custo bastante alto de implantação e de uso, possuem tecnologia operacional que consome reagentes e mão-de-obra especializada, o que faz com que se tenha um custo elevado. Por isso uma tecnologia simples e que não deixa resíduos tóxicos no produto final é interessante, além de necessária. No presente trabalho, foram feitas trocas com íons de cálcio e bário nas zeólitas NaX e NaA. O extrato aquoso de Stévia foi então colocado em contato com as zeólitas modificadas obtidas na troca CaX, BaX, CaA e BaA; depois foi analisado o efeito desse contato. Os resultados mostraram que o extrato que ficou em contato com a zeólita CaX foi o que obteve maior descoloração e não teve as características iniciais alteradas, em termos de concentração de glicosídeos e sabor. Com testes feitos em batelada à temperatura ambiente, o contato extrato aquoso de Stévia/Zeólita CaX, proporcionou uma descoloração entre 70-80%. Além disso, houve uma queda aproximada de 10% em CHT, o que não é uma variação significativa e de 30% em Brix. Foram feitos testes variando a massa de zeólita, para com isso obter a massa ideal para o processo. Com a temperatura também foi feito teste semelhante, onde foram fixadas a massa de zeólita e a concentração do extrato, a fim de determinar qual a temperatura ideal de processo. Com os testes foi possível observar que a agitação é fundamental, pois diminui o tempo de processo. Os testes mostraram ser possível a regeneração da zeólita, sendo possível sua utilização por mais de uma vez no processo; e com essa zeólita foi possível alcançar uma descoloração entre 65-70%. A partir dos resultados obtidos em testes bateladas, foi montado um módulo, com leito fixo de zeólita CaX onde foi passado o extrato aquoso de Stévia em fluxo ascendente. A vazão controlada para que o tempo de contato fosse o suficiente. Na clarificação do extrato aquoso de Stévia, o processo com zeólitas se mostra vantajoso, pois: tem baixo custo, não deixa resíduos nocivos à saúde, a tecnologia operacional é de fácil entendimento e aplicação e não representa nenhum risco ao meio ambiente.xv, 90 pUniversidade Estadual de MaringáBrasilDepartamento de Engenharia QuímicaPrograma de Pós-Graduação em Engenharia QuímicaUEMMaringá, PRCentro de TecnologiaEneida Sala CossichCélia Regina Granhen Tavares - UEMEdson Antonio da Silva - UNIOESTESirlei Jaiana Kleinübing - UNICAMPMoraes, Élida de Paula2018-04-17T17:42:52Z2018-04-17T17:42:52Z2000info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesishttp://repositorio.uem.br:8080/jspui/handle/1/3715porinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da Universidade Estadual de Maringá (RI-UEM)instname:Universidade Estadual de Maringá (UEM)instacron:UEM2018-10-19T18:06:55Zoai:localhost:1/3715Repositório InstitucionalPUBhttp://repositorio.uem.br:8080/oai/requestopendoar:2024-04-23T14:56:52.111010Repositório Institucional da Universidade Estadual de Maringá (RI-UEM) - Universidade Estadual de Maringá (UEM)false |
dc.title.none.fl_str_mv |
Clarificação do extrato aquoso de Stevia Rebaudiana Bertoni através de adsorção em zeólitas modificadas Clarification of the aqueous extract of Stevia Rebaudiana Bertoni by adsorption in modified zeolites |
title |
Clarificação do extrato aquoso de Stevia Rebaudiana Bertoni através de adsorção em zeólitas modificadas |
spellingShingle |
Clarificação do extrato aquoso de Stevia Rebaudiana Bertoni através de adsorção em zeólitas modificadas Moraes, Élida de Paula Stevia Rebaudiana Bertoni Clarificação do extrato aquoso Zeólitas modificadas Adsorção Método de clarificação do extrato Adsorção seletiva Brasil. Engenharias Engenharia Química |
title_short |
Clarificação do extrato aquoso de Stevia Rebaudiana Bertoni através de adsorção em zeólitas modificadas |
title_full |
Clarificação do extrato aquoso de Stevia Rebaudiana Bertoni através de adsorção em zeólitas modificadas |
title_fullStr |
Clarificação do extrato aquoso de Stevia Rebaudiana Bertoni através de adsorção em zeólitas modificadas |
title_full_unstemmed |
Clarificação do extrato aquoso de Stevia Rebaudiana Bertoni através de adsorção em zeólitas modificadas |
title_sort |
Clarificação do extrato aquoso de Stevia Rebaudiana Bertoni através de adsorção em zeólitas modificadas |
author |
Moraes, Élida de Paula |
author_facet |
Moraes, Élida de Paula |
author_role |
author |
dc.contributor.none.fl_str_mv |
Eneida Sala Cossich Célia Regina Granhen Tavares - UEM Edson Antonio da Silva - UNIOESTE Sirlei Jaiana Kleinübing - UNICAMP |
dc.contributor.author.fl_str_mv |
Moraes, Élida de Paula |
dc.subject.por.fl_str_mv |
Stevia Rebaudiana Bertoni Clarificação do extrato aquoso Zeólitas modificadas Adsorção Método de clarificação do extrato Adsorção seletiva Brasil. Engenharias Engenharia Química |
topic |
Stevia Rebaudiana Bertoni Clarificação do extrato aquoso Zeólitas modificadas Adsorção Método de clarificação do extrato Adsorção seletiva Brasil. Engenharias Engenharia Química |
description |
The glicosydes, stevioside, rebaudioside A, B, C, D, E and dulcosides A and B, wichare extracted of the dry leaves of the native plant denominated Stevia rebaudiana Bertonior simply Stevia, are used as sweeteners. One of the process stages of extraction of thoseglicosides is the clarification of the aqueous extract of Stevia. The clarification is a very important stage because the visual quality of the product depends on it, for that reason there are many published works and research in progress in that area. The conventional processes of clarification has some disadvantages: it leaves toxic residues to the health, it has a high cost of implantation and maintenance, and the operational technology consumes reagentes and specialized labor which elevates cost. For this reason a simple technology that does not result in toxic residues in the final product is interesting and necessary. In the present work ionic exchanges were made with ions of calcium and barium in zeolites NaX and NaA. The effect of the contact of aqueous extract of dry leaves of Stevia rebaudiana Bertoni leaves with the CaX BaX, CaA and BaA was evaluated. The extract of Stevia that was in contact with the zeolite CaX showed the largest clarification and did not present alterations of its initial of characteristics, in terms of concentration of glicosydes and flavour. In batch tests at ambient temperature, the contact of Stevia aqueous extract and CaX zeolite provided a clarification between 70-80%, resulting in a decrease of approximately 10% CHT, the variation are not significant and of 30% Brix. Tests weremade varying the zeolite mass, to obtain the ideal mass of zeolite for the process. Similar tests were performed to evaluated the temperature effect in which the zeolite mass and the concentration of the extract were maintained constant. It was also observed that agitation is fundamental, because it decreases the process time. It was verified that the zeolite can be regenerated, allowing its use for than once; and with the regenerated zeolite, it was possible to obtain a clarification between 65-70%. After the performance on these batch tests, an experimental module consisting of a fixed bed of zeolite CaX was built. The Stevia aqueous extract was passed upwards and flow rate was controled to promote adequate contact. In the clarification of the Stevia aqueous extract, the process with zeolites has proven to be advantageous because: it has low cost (zeolite), it doesn't leave residues that can be toxic, the operational technology is of easy understanding and application and in addition, is not associated to risks to the environment. |
publishDate |
2000 |
dc.date.none.fl_str_mv |
2000 2018-04-17T17:42:52Z 2018-04-17T17:42:52Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://repositorio.uem.br:8080/jspui/handle/1/3715 |
url |
http://repositorio.uem.br:8080/jspui/handle/1/3715 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Universidade Estadual de Maringá Brasil Departamento de Engenharia Química Programa de Pós-Graduação em Engenharia Química UEM Maringá, PR Centro de Tecnologia |
publisher.none.fl_str_mv |
Universidade Estadual de Maringá Brasil Departamento de Engenharia Química Programa de Pós-Graduação em Engenharia Química UEM Maringá, PR Centro de Tecnologia |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da Universidade Estadual de Maringá (RI-UEM) instname:Universidade Estadual de Maringá (UEM) instacron:UEM |
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Universidade Estadual de Maringá (UEM) |
instacron_str |
UEM |
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UEM |
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Repositório Institucional da Universidade Estadual de Maringá (RI-UEM) |
collection |
Repositório Institucional da Universidade Estadual de Maringá (RI-UEM) |
repository.name.fl_str_mv |
Repositório Institucional da Universidade Estadual de Maringá (RI-UEM) - Universidade Estadual de Maringá (UEM) |
repository.mail.fl_str_mv |
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1813258665771139072 |