Parâmetros cinéticos da cristalização de sacarose em diferentes escalas
Autor(a) principal: | |
---|---|
Data de Publicação: | 2018 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFSCAR |
Texto Completo: | https://repositorio.ufscar.br/handle/ufscar/10262 |
Resumo: | This work aims to determine kinetic parameters capable of describing the crystallization of sucrose using bench scale and pilot scale reactors. Sucrose was chosen because it is a very important product for Brazil, which is responsible for exporting 50% of the world's import demand, being the biggest producer and exporter of sucrose in the world. In order to obtain the necessary parameters to optimize existing equipment and to enable the design of new ones, 15 experiments were carried out in a reactor with a volume of 1 liter, the bench scale reactor, and 5 experiments in a reactor a volume of 10 liter, identified as the pilot scale reactor. In the bench reactor the turbidity of the suspension was monitored, which can be related to the crystal surface area, and in 12 out of 15 experiments were varied the stirring velocity, the cooling rate and the initial sucrose concentration, 60, 70 and 80 rpm, 0.106 ⁰C/min and 0.760 ⁰C/min and 3.7 and 2.9 gsucrose/gwater, and the solution was seeded 2 ⁰C below the saturation temperature. In the other three experiments the stirring speed was set at 70 rpm, the cooling rate was set at 0.185 ⁰C/min and the initial sucrose concentration was sat at 2.9 gssucrose/gwater and the solutions were seeded at 4, 9 and 14 ⁰C below the saturation temperature. The experimental results of the cooling crystallizations in the bench scale reactor and the pilot reactor obtained and the adjusted kinetic parameters are presented and discussed. It is concluded that agglomeration occurs intensely during the crystallization of the sucrose, surpassing the secondary nucleation and that the experiments with a stirring speed set at 70 rpm in the bench reactor were the most affected. The temperature significantly affects the kinetics of crystallization and the estimated mean nucleation and growth parameters apply at both scales. A general adjustment was made with all the experiments that presented a good potential, since it was adjusted taking into account the speed at the tip of the impeller, thus being able to have the parameters adapted for different scales or operating conditions. |
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Barros, Guilherme LópezBernardo, Andréhttp://lattes.cnpq.br/5705402824877708http://lattes.cnpq.br/77008018430484930b42265f-b7e3-4a98-8edb-795bef4407a42018-07-04T20:08:43Z2018-07-04T20:08:43Z2018-03-07BARROS, Guilherme López. Parâmetros cinéticos da cristalização de sacarose em diferentes escalas. 2018. Dissertação (Mestrado em Engenharia Química) – Universidade Federal de São Carlos, São Carlos, 2018. Disponível em: https://repositorio.ufscar.br/handle/ufscar/10262.https://repositorio.ufscar.br/handle/ufscar/10262This work aims to determine kinetic parameters capable of describing the crystallization of sucrose using bench scale and pilot scale reactors. Sucrose was chosen because it is a very important product for Brazil, which is responsible for exporting 50% of the world's import demand, being the biggest producer and exporter of sucrose in the world. In order to obtain the necessary parameters to optimize existing equipment and to enable the design of new ones, 15 experiments were carried out in a reactor with a volume of 1 liter, the bench scale reactor, and 5 experiments in a reactor a volume of 10 liter, identified as the pilot scale reactor. In the bench reactor the turbidity of the suspension was monitored, which can be related to the crystal surface area, and in 12 out of 15 experiments were varied the stirring velocity, the cooling rate and the initial sucrose concentration, 60, 70 and 80 rpm, 0.106 ⁰C/min and 0.760 ⁰C/min and 3.7 and 2.9 gsucrose/gwater, and the solution was seeded 2 ⁰C below the saturation temperature. In the other three experiments the stirring speed was set at 70 rpm, the cooling rate was set at 0.185 ⁰C/min and the initial sucrose concentration was sat at 2.9 gssucrose/gwater and the solutions were seeded at 4, 9 and 14 ⁰C below the saturation temperature. The experimental results of the cooling crystallizations in the bench scale reactor and the pilot reactor obtained and the adjusted kinetic parameters are presented and discussed. It is concluded that agglomeration occurs intensely during the crystallization of the sucrose, surpassing the secondary nucleation and that the experiments with a stirring speed set at 70 rpm in the bench reactor were the most affected. The temperature significantly affects the kinetics of crystallization and the estimated mean nucleation and growth parameters apply at both scales. A general adjustment was made with all the experiments that presented a good potential, since it was adjusted taking into account the speed at the tip of the impeller, thus being able to have the parameters adapted for different scales or operating conditions.Este trabalho tem como objetivo determinar parâmetros cinéticos de cristalização capazes de descrever a cristalização da sacarose utilizando-se de reatores em escala de bancada e piloto. A sacarose foi escolhida por ser um produto muito importante para Brasil, que é responsável por exportar 50% da demanda mundial, sendo o maior produtor e exportador de sacarose do mundo. Para obter os parâmetros necessários para otimizar os equipamentos já existentes e viabilizar o projeto de novos, foram realizados 15 experimentos em um reator de volume 1 litro, o reator em escala de bancada, e 5 experimentos em um reator de 10 litros, identificado como o reator em escala piloto. No reator de bancada acompanhou-se a turbidez da suspensão, que pode ser relacionada com a área superficial de cristais, e, em 12 dos 15 experimentos, variou-se a velocidade de agitação, 60, 70 e 80 rpm, a velocidade de resfriamento, 0,106 ⁰C/min e 0,760 ⁰C/min, e a concentração inicial de sacarose, 3,7 e 2,9 gsacarose/gágua, realizando a semeadura 2⁰C abaixo da temperatura de saturação. Nos outros 3 experimentos fixou-se a velocidade de agitação em 70 rpm, a velocidade de resfriamento em 0,185 ⁰C/min e a concentração inicial de sacarose em 2,9 gsacarose/gágua e variou-se a temperatura de semeadura 4, 9 e 14 ⁰C abaixo da temperatura de saturação. No reator piloto acompanhou-se o índice de refração da suspensão e fixou-se a velocidade de agitação em 50 rpm, variou-se a velocidade de resfriamento, a velocidade mínima possível do reator e 0,162 ⁰C/min, a concentração inicial de sacarose, 3,7 e 2,9 gsacarose/gágua, e a semeadura foi realizada 2⁰C abaixo da temperatura de saturação para o primeiro experimento e 9⁰C abaixo da temperatura de saturação para os outros. Os resultados experimentais das cristalizações por resfriamento no reator em escala de bancada e do reator piloto obtidos e os parâmetros cinéticos ajustados estão apresentados e discutidos. Têm-se como conclusões que a aglomeração ocorre de forma intensa durante a cristalização da sacarose, superando a nucleação secundária, sendo os experimentos realizados com uma velocidade de agitação de 70 rpm no reator de bancada os mais afetados. A temperatura afeta a cinética de cristalização de forma significativa e os parâmetros de nucleação e crescimento médios estimados se aplicam em ambas as escalas. Foram realizados ajustes estimando a constante de velocidade de crescimento, a constante de nucleação, a energia de crescimento, a energia de nucleação e o kernel de aglomeração para as duas escalas e então foi realizado um ajuste geral com todos os experimentos que apresenta um bom potencial, por ter sido ajustado levando em conta a velocidade na ponta do impelidor, podendo assim ter os parâmetros adaptados para diferentes escalas ou condições operacionais.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)CAPES: 1589886.porUniversidade Federal de São CarlosCâmpus São CarlosPrograma de Pós-Graduação em Engenharia Química - PPGEQUFSCarSacaroseMétodo dos momentosNucleaçãoCrescimentoAglomeraçãoParâmetros cinéticosSucroseMethod of momentsNucleationGrowthAgglomerationKinetic parametersENGENHARIAS::ENGENHARIA QUIMICA::OPERACOES INDUSTRIAIS E EQUIPAMENTOS PARA ENGENHARIA QUIMICAENGENHARIAS::ENGENHARIA QUIMICA::PROCESSOS INDUSTRIAIS DE ENGENHARIA QUIMICAParâmetros cinéticos da cristalização de sacarose em diferentes escalasinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisOnline6006005fdc0b6c-5b77-4308-8267-c2d4e5e00c4dinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARLICENSElicense.txtlicense.txttext/plain; charset=utf-81957https://repositorio.ufscar.br/bitstream/ufscar/10262/5/license.txtae0398b6f8b235e40ad82cba6c50031dMD55ORIGINALBARROS_Guilherme_2018.pdfBARROS_Guilherme_2018.pdfapplication/pdf5228825https://repositorio.ufscar.br/bitstream/ufscar/10262/6/BARROS_Guilherme_2018.pdf7013de1131b24414ce38558a86f61a79MD56TEXTBARROS_Guilherme_2018.pdf.txtBARROS_Guilherme_2018.pdf.txtExtracted texttext/plain225988https://repositorio.ufscar.br/bitstream/ufscar/10262/7/BARROS_Guilherme_2018.pdf.txtacba661c1d5dacc58e1b5ca9476f656bMD57THUMBNAILBARROS_Guilherme_2018.pdf.jpgBARROS_Guilherme_2018.pdf.jpgIM Thumbnailimage/jpeg6659https://repositorio.ufscar.br/bitstream/ufscar/10262/8/BARROS_Guilherme_2018.pdf.jpg2e5e5eddbc936a736ac82f64d1f1178fMD58ufscar/102622023-09-18 18:31:15.714oai:repositorio.ufscar.br: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Repositório InstitucionalPUBhttps://repositorio.ufscar.br/oai/requestopendoar:43222023-09-18T18:31:15Repositório Institucional da UFSCAR - Universidade Federal de São Carlos (UFSCAR)false |
dc.title.por.fl_str_mv |
Parâmetros cinéticos da cristalização de sacarose em diferentes escalas |
title |
Parâmetros cinéticos da cristalização de sacarose em diferentes escalas |
spellingShingle |
Parâmetros cinéticos da cristalização de sacarose em diferentes escalas Barros, Guilherme López Sacarose Método dos momentos Nucleação Crescimento Aglomeração Parâmetros cinéticos Sucrose Method of moments Nucleation Growth Agglomeration Kinetic parameters ENGENHARIAS::ENGENHARIA QUIMICA::OPERACOES INDUSTRIAIS E EQUIPAMENTOS PARA ENGENHARIA QUIMICA ENGENHARIAS::ENGENHARIA QUIMICA::PROCESSOS INDUSTRIAIS DE ENGENHARIA QUIMICA |
title_short |
Parâmetros cinéticos da cristalização de sacarose em diferentes escalas |
title_full |
Parâmetros cinéticos da cristalização de sacarose em diferentes escalas |
title_fullStr |
Parâmetros cinéticos da cristalização de sacarose em diferentes escalas |
title_full_unstemmed |
Parâmetros cinéticos da cristalização de sacarose em diferentes escalas |
title_sort |
Parâmetros cinéticos da cristalização de sacarose em diferentes escalas |
author |
Barros, Guilherme López |
author_facet |
Barros, Guilherme López |
author_role |
author |
dc.contributor.authorlattes.por.fl_str_mv |
http://lattes.cnpq.br/7700801843048493 |
dc.contributor.author.fl_str_mv |
Barros, Guilherme López |
dc.contributor.advisor1.fl_str_mv |
Bernardo, André |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/5705402824877708 |
dc.contributor.authorID.fl_str_mv |
0b42265f-b7e3-4a98-8edb-795bef4407a4 |
contributor_str_mv |
Bernardo, André |
dc.subject.por.fl_str_mv |
Sacarose Método dos momentos Nucleação Crescimento Aglomeração Parâmetros cinéticos Sucrose |
topic |
Sacarose Método dos momentos Nucleação Crescimento Aglomeração Parâmetros cinéticos Sucrose Method of moments Nucleation Growth Agglomeration Kinetic parameters ENGENHARIAS::ENGENHARIA QUIMICA::OPERACOES INDUSTRIAIS E EQUIPAMENTOS PARA ENGENHARIA QUIMICA ENGENHARIAS::ENGENHARIA QUIMICA::PROCESSOS INDUSTRIAIS DE ENGENHARIA QUIMICA |
dc.subject.eng.fl_str_mv |
Method of moments Nucleation Growth Agglomeration Kinetic parameters |
dc.subject.cnpq.fl_str_mv |
ENGENHARIAS::ENGENHARIA QUIMICA::OPERACOES INDUSTRIAIS E EQUIPAMENTOS PARA ENGENHARIA QUIMICA ENGENHARIAS::ENGENHARIA QUIMICA::PROCESSOS INDUSTRIAIS DE ENGENHARIA QUIMICA |
description |
This work aims to determine kinetic parameters capable of describing the crystallization of sucrose using bench scale and pilot scale reactors. Sucrose was chosen because it is a very important product for Brazil, which is responsible for exporting 50% of the world's import demand, being the biggest producer and exporter of sucrose in the world. In order to obtain the necessary parameters to optimize existing equipment and to enable the design of new ones, 15 experiments were carried out in a reactor with a volume of 1 liter, the bench scale reactor, and 5 experiments in a reactor a volume of 10 liter, identified as the pilot scale reactor. In the bench reactor the turbidity of the suspension was monitored, which can be related to the crystal surface area, and in 12 out of 15 experiments were varied the stirring velocity, the cooling rate and the initial sucrose concentration, 60, 70 and 80 rpm, 0.106 ⁰C/min and 0.760 ⁰C/min and 3.7 and 2.9 gsucrose/gwater, and the solution was seeded 2 ⁰C below the saturation temperature. In the other three experiments the stirring speed was set at 70 rpm, the cooling rate was set at 0.185 ⁰C/min and the initial sucrose concentration was sat at 2.9 gssucrose/gwater and the solutions were seeded at 4, 9 and 14 ⁰C below the saturation temperature. The experimental results of the cooling crystallizations in the bench scale reactor and the pilot reactor obtained and the adjusted kinetic parameters are presented and discussed. It is concluded that agglomeration occurs intensely during the crystallization of the sucrose, surpassing the secondary nucleation and that the experiments with a stirring speed set at 70 rpm in the bench reactor were the most affected. The temperature significantly affects the kinetics of crystallization and the estimated mean nucleation and growth parameters apply at both scales. A general adjustment was made with all the experiments that presented a good potential, since it was adjusted taking into account the speed at the tip of the impeller, thus being able to have the parameters adapted for different scales or operating conditions. |
publishDate |
2018 |
dc.date.accessioned.fl_str_mv |
2018-07-04T20:08:43Z |
dc.date.available.fl_str_mv |
2018-07-04T20:08:43Z |
dc.date.issued.fl_str_mv |
2018-03-07 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
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publishedVersion |
dc.identifier.citation.fl_str_mv |
BARROS, Guilherme López. Parâmetros cinéticos da cristalização de sacarose em diferentes escalas. 2018. Dissertação (Mestrado em Engenharia Química) – Universidade Federal de São Carlos, São Carlos, 2018. Disponível em: https://repositorio.ufscar.br/handle/ufscar/10262. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufscar.br/handle/ufscar/10262 |
identifier_str_mv |
BARROS, Guilherme López. Parâmetros cinéticos da cristalização de sacarose em diferentes escalas. 2018. Dissertação (Mestrado em Engenharia Química) – Universidade Federal de São Carlos, São Carlos, 2018. Disponível em: https://repositorio.ufscar.br/handle/ufscar/10262. |
url |
https://repositorio.ufscar.br/handle/ufscar/10262 |
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por |
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openAccess |
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Universidade Federal de São Carlos Câmpus São Carlos |
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Programa de Pós-Graduação em Engenharia Química - PPGEQ |
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UFSCar |
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Universidade Federal de São Carlos Câmpus São Carlos |
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