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Title: Ease of delignification assesment of wood from different Eucalyptus species by pyrolysis (TMAH)-GC/MS and CP/MAS 13C-NMR spectrometry
Authors: González-Vila, Francisco Javier ; Almendros Martín, Gonzalo ; Río Andrade, José Carlos del ; Martín Martínez, Francisco; Gutiérrez Suárez, Ana ; Romero Sánchez, Juan
Issue Date: 1998
Publisher: GSF National Research Center for Environment and Health
Citation: 14th International Symposium of Analytical and Applied Pyrolisis. Abstracts: 62 (1998)
Abstract: Pulp yield and ease of delignification are the most important technological characteristics of the wood in Kraft cooking. The usual way to assess the ease of delignification of wood involves the comparison of the alkali charges needed to achieve the same residual lignin degree (kappa number). The chemical structure of wood components, lignin in particular, influence the delignification process, and thus the syringyl:guaiacyl (S:G) ratios of Kraft lignins (calculated on the13C-NMR spectra) have been found to be strongly correlated with the ease of delignification of Eucalyptus globulus woods (Carvalho et al., 1995). The aim of this study is to check the feasibility of using direct Pyrolysis in the presence of tetramethylammonium hydroxide (TMAH) to determine the ease of delignification of hardwoods. It has been applied to different Eucalyptus species ( E. globulus, E. grandis and E. camaldulensis) from different geographical origins, which are nowadays widely used as raw material for pulp production. This is a fast, sensitive, one-step procedure that allows the calculation of S:G ratios in the selected Eucalyptus species. The S:G ratios thus calculated are well correlated with those obtained by CPMAS 13C-NMR spectra and with the ease of delignification. On the other hand, the differences observed among the high molecular weight pyrolysis products from lignin (and possibly from tannins) generated by pyrolysis-methylation, might be used as indicators of the various Eucalyptus species.
Description: Póster presentado al citado simposio, celebrado del 18-20 de mayo, 1998, en Neuherberg, München, Germany. Enlazamos con la publicación: http://hdl.handle.net/10261/39936
URI: http://hdl.handle.net/10261/55044
Appears in Collections:(IRNAS) Comunicaciones congresos

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