Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/107758
Type: Artigo de evento
Title: Equilibrium Isotherms Of A Biodegradable Polymer Polyhydroxybutyrate (phb):heat Of Desorption Determination 661
Author: Da Rosa G.S.
De Godoi F.C.
Marsaioli Jr. A.
Dos Santos Rocha S.C.
Abstract: Polyhydroxybutyrate (PHB) belongs to a group of bacterial polyesters that may be considered as "green plastics", because of their biodegradable nature. The knowledge of the relationship between moisture content and water activity is essential for drying and storage. The thermodynamic equilibrium is characterized by equilibrium isotherms, and its determination is essential for better understanding of mechanisms in drying operations. Results on desorption isotherms of PHB are not available in the literature. Thus, the aim of this study was to analyze the equilibrium isotherms of PHB using GAB (Guggenhein-Anderson-de Boer) and GDW (generalized D́Arcy and Watt) models, and to determine the heat of desorption using Clausius-Clapeyron equation. The moisture equilibrium data for desorption isotherms of PHB were investigated at 40, 50 and 60 °C using the gravimetric static method. The monolayer moisture contents (from 0.16 to 0.23 % d.b.) decreased with increasing temperature. The Clausius-Clapeyron equation was considered adequate to forecast the heat of desorption, which was estimated as a function of the moisture content. © 2011.
Editor: Italian Association of Chemical Engineering - AIDIC
Rights: fechado
Identifier DOI: 10.3303/CET1124111
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-79955514925&partnerID=40&md5=a1ed5b47499acf1d4a8f0304ef04ccec
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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