Actas de congresos
Equilibrium Isotherms Of A Biodegradable Polymer Polyhydroxybutyrate (phb):heat Of Desorption Determination 661
Registro en:
Chemical Engineering Transactions. Italian Association Of Chemical Engineering - Aidic, v. 24, n. , p. 661 - 666, 2011.
19749791
10.3303/CET1124111
2-s2.0-79955514925
Autor
Da Rosa G.S.
De Godoi F.C.
Marsaioli Jr. A.
Dos Santos Rocha S.C.
Institución
Resumen
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. 24
661 666 Ariahu, C.C., Kaze, S.A., Achem, C.D., Moisture sorption characteristics of tropical fresh water crayfish (Procambarus clarkii) (2006) Journal of Food Engineering, 75 (3), pp. 355-363. , DOI 10.1016/j.jfoodeng.2005.03.062, PII S0260877405002591 Barud, H.S., Souza, J.L., Santos, D.B., Crespi, M.S., Ribeiro, C.A., Messaddeq, Y., Ribeiro, S.J.L., Bacterial cellulose/poly(3-hydroxybutyrate) composite membranes (2010) Carbohydrate Polymers, , in Press Furmaniak, S., Terzyk, A.P., Gauden, P.A., The general mechanism of water sorption on foodstuffs - Importance of the multitemperature fitting of data and the hierarchy of models (2007) Journal of Food Engineering, 82 (4), pp. 528-535. , DOI 10.1016/j.jfoodeng.2007.03.012, PII S026087740700180X Furmaniak, S., Terzyk, A., Golembiewski, R., Gauden, P.A., Czepirski, L., Searching the most optimal model of water sorption on foodstuffs in the whole range of relative humidity (2009) Food Research International, 42, pp. 1203-1214 Gocho, H., Shimizu, H., Tanioka, A., Chou, T.-J., Nakajima, T., Effect of polymer chain end on sorption isotherm of water by chitosan (2000) Carbohydrate Polymers, 41 (1), pp. 87-90. , DOI 10.1016/S0144-8617(99)00113-7 Godoi, F.C., Boin, E.A.S.F., Pereira, N.R., Rocha, S.C.S., Fluid dynamics and drying of cohesive particles of a biodegradable polymer (Poly-Hydroxybutyrate) in a rotating pulsed fluidized bed (2010) Drying Technology, 28, pp. 1297-1306 Hill, C.A.S., Norton, A., Newman, G., The water vapor sorption behavior of natural fibers (2009) Journal of Applied Polymer Science, 112, pp. 1524-1537 Mantelatto, P.E., Nazareno, A.S.D., Durao, A.S., (2008) PHB Industrial S.A., Process for extracting and recovering polyhydroxyalkanoates (PHAS) from cellular biomass, , US 2008/0193987 Al Maskan, M., Gogus, F., Sorption isotherms and drying characteristics of Mulberry (Morus alba) (1998) Journal of Food Engineering, 37, pp. 437-449 Moraes, M.A., Rosa, G.S., Pinto, L.A.A., Moisture sorption isotherms and thermodynamic properties of apple Fuji and garlic (2008) International Journal of Food Science and Technology, 43, pp. 1824-1831 Oliveira, E.G., Rosa, G.S., Moraes, M.A., Pinto, L.A.A., Moisture sorption characteristics of microalgae Spirulina platensis (2009) Brazilian Journal of Chemical Engineering, 26, pp. 189-197 Palou, E., Lopez-Malo, A., Argaiz, A., Effect of temperature on the moisture sorption isotherms of some cookies and corn snacks (1997) Journal of Food Engineering, 31 (1), pp. 85-93. , PII S0260877496000192 Perry, R.H., Green, D.W., Chemical engineers (1997) Handbook, pp. 74-103. , 7th ed..McGraw-Hill New YorkEds Rizvi, S.S.H., Thermodynamic properties of foods in dehydration (1995) Engineering Properties of Foods, , Eds. Rao M.A. and Risvi S.S.H., 2nd ed., Marcel Dekker, New York Sombatmankhong, K., Sanchavanakit, N., Pavasant, P., Supaphol, P., Bone scaffolds from electrospun fiber mats of poly(3-hydroxybutyrate), poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and their blend (2007) Polymer, 48 (5), pp. 1419-1427. , DOI 10.1016/j.polymer.2007.01.014, PII S0032386107000511 Soysal, Y., Oztekin, S., Equilibrium moisture content equations for some medicinal and aromatic plants (1999) Journal of Agricultural and Engineering Research, 74 (3), pp. 317-324