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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Effect of diffusional limitations on the kinetics of deacetylation of chitin/chitosan

Texto completo
Autor(es):
de Souza, Juliana Rodrigues [1] ; Giudici, Reinaldo [1]
Número total de Autores: 2
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Dept Chem Engn, Escola Politecn, Av Prof Luciano Gualberto 380, Travessa 3, BR-05508010 Sao Paulo, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: Carbohydrate Polymers; v. 254, FEB 15 2021.
Citações Web of Science: 0
Resumo

A new model is proposed for the kinetics of the heterogeneous deacetylation of chitin/chitosan. This new model is able to represent the process over much broader ranges than the other kinetic models reported in the literature. The unreacted shrinking core model was modified with the inclusion of increasing diffusional effects as the reaction progresses, causing the rate to slow down and preventing the degree of deacetylation reaching 100 %, even in the presence of excess NaOH. The model was validated with data collected in experiments with different NaOH concentrations and temperatures. The proposed model was able to represent the experimental data correctly over the entire experiment span, resulting in a model with proven predictive ability, in contrast to existing kinetic models that have been applied in a piecewise fashion over a rather limited time range of the process. The proposed model represents an improvement in the understanding of the deacetylation process. (AU)

Processo FAPESP: 15/50684-9 - Sustainable gas pathways for Brazil: from microcosm to macrocosm
Beneficiário:Reinaldo Giudici
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 13/50218-2 - CEPEMA - Centro Cooperativo em Engenharia Ambiental
Beneficiário:Claudio Augusto Oller do Nascimento
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 14/50279-4 - Brasil Research Centre for Gas Innovation
Beneficiário:Julio Romano Meneghini
Linha de fomento: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia