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Please use this identifier to cite or link to this item: http://hdl.handle.net/10400.5/4187

Title: Influência das diferentes granulometrias na composição química das cascas de Eucalyptus globulus Labill., Betula pendula Roth, Picea abies (L.) Karst, Pinus sylvestris L. e Pinus pinea L.
Other Titles: Influence of different particle sizes in the bark chemical composition of Eucalyptus globulus Labill., Betula pendula Roth, Picea abies (L.) Karst, Pinus sylvestris L. e Pinus pinea L.
Authors: Mirra, Inês Martins Pereira
Advisor: Pereira, Helena Margarida Nunes
Miranda, Isabel Maria Sanches
Gominho, Jorge Manuel d'Almeida
Keywords: bark
tissues
particle size analysis
bulk density
chemical composition
Issue Date: 2011
Publisher: ISA/UTL
Citation: Mirra, Inês Martins Pereira - Influência das diferentes granulometrias na composição química das cascas de Eucalyptus globulus Labill., Betula pendula Roth, Picea abies (L.) Karst., Pinus sylvestris L. e Pinus pinea L.. Lisboa: ISA, 2011
Abstract: The goal of this report is to characterize the bark of five industrially important forest species in Europe - Eucalyptus globulus, Betula pendula, Picea abies, Pinus sylvestris e Pinus pinea and to define their potential use as a source of value added chemical products. It was performed the anatomical characterization of bark tissues (dissociated elements), the selective fractionation (size distribution, characterization of particle shape, separation of density and determination of bulk density), the average of basic chemical composition and particle size of three reference fractions (ash, extractives, suberin, Klason lignin, acid soluble lignin, holocellulose and 1% NaOH extraction). The anatomical study shows that there is no differential separation of the cellular elements of the tissues of the bark in seven particle size fractions. The physical process of fractioning showed that, for all barks, over 50% of the mass of material consisted of coarse particles with 6 mm average diameter. On the other hand, there was no direct correlation between the values of bulk density and particle diameter. It has only been possible to separate the birch bark and scots pine by difference in density fluctuations in water. The mean values of the chemical composition brought out that the barks of softwood showed higher content of total extractives, lignin and yield of 1% NaOH extraction. Considering the three different particle size fractions, the fine fraction showed a higher content of ash, total extractives and 1% NaOH extraction. There was no significant change in the content of suberin and holocellulose.
Description: Mestrado em Engenharia Florestal e dos Recursos Naturais - Instituto Superior de Agronomia
URI: http://hdl.handle.net/10400.5/4187
Appears in Collections:BISA - Dissertações de Mestrado / Master Thesis

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