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Master's Dissertation
DOI
10.11606/D.3.2007.tde-08012008-113625
Document
Author
Full name
Gisele Milanello do Amaral
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2007
Supervisor
Committee
Giudici, Reinaldo (President)
Maciel Filho, Rubens
Paiva, José Luis de
Title in Portuguese
Modelagem matemática de reator para produção de álcoois graxos etoxilados.
Keywords in Portuguese
Modelagem matemática
Polimerização
Reatores químicos
Transporte de massa
Abstract in Portuguese
Foi desenvolvido modelo matemático para o processo de produção de álcoois etoxilados em um reator batelada com spray da fase líquida na fase gasosa. O modelo considera a cinética da polimerização iônica e a transferência de massa de óxido de eteno entre as fases gasosa e líquida. A cinética foi estudada a partir de dados previamente obtidos em laboratório. Para modelagem da transferência de massa, foram utilizados dados de bateladas industriais. Foram testados vários modelos de transferência de massa encontrados na literatura, sendo que o modelo que se mostrou mais adequado para este reator industrial foi o de gotas com circulação interna. A partir do modelo obtido da cinética e da transferência de massa, foi analisada a influência de parâmetros de projeto, como a vazão de recirculação de líquido, a relação entre a altura e o raio do reator e o tipo de spray na produtividade deste. Observou-se que a maior vazão de recirculação aumenta a produtividade do reator, assim como o aumento da altura do reator. O tipo e o diâmetro da gota do spray também influenciam a produtividade do reator.
Title in English
Mathematical modeling of the ethoxylated alcohols reactor.
Keywords in English
Ethoxylated fatty alcohol
Ethylene oxide
Mathematical model
Spray tower loop reactor
Surfactant
Abstract in English
A mathematical model for the production of ethoxylated alcohols in a spray tower loop reactor was developed. The model considers the reaction as an ionic polymerization and the ethylene oxide mass transfer from the vapor phase to the liquid phase. The kinetics was obtained from a laboratory scale reactor data. The mass transfer model was obtained from the industrial reactor data. Several models for the mass transfer of ethylene oxide from gas phase to the liquid droplets were tested, and it was found that the most appropriate mass transfer model for this industrial reactor was the internally well-mixed drop model. From the kinetics and the mass transfer model, the influence of the pump recirculation flow rate, the ratio between the reactor height and radius and the spray performance was analyzed. The results show that higher reactor productivity can be obtained using higher recirculation flow and higher reactor height. The spray nozzle performance and the drop diameter also influence the reactor productivity.
 
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Errata_Gisele.pdf (13.46 Kbytes)
Publishing Date
2008-02-07
 
WARNING: The material described below relates to works resulting from this thesis or dissertation. The contents of these works are the author's responsibility.
  • Amaral, G. M., and GIUDICI, R. Kinetics and Modeling of Fatty Alcohol Ethoxylation in an Industrial Spray Loop Reactor [doi:10.1002/ceat.201100215]. Chemical Engineering & Technology [online], 2011, vol. 34, p. 1635-1644.
All rights of the thesis/dissertation are from the authors
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