Modification of the lignin structure of eucalypt feedstocks during chemical deconstruction by kraft, soda-AQ and soda-O2 processing
2012
Prinsen, Pepijn | Gutiérrez Suárez, Ana | Río Andrade, José Carlos del | Berbís, Manuel Álvaro | Jiménez-Barbero, Jesús | Martínez, Ángel T. | Liitiä, Tiina | Tamminen, Tarja
The modification of the lignin structure in an eucalypt feedstock after alkaline deconstruction by the kraft, soda-AQ and soda-O2 processes was assessed. For this purpose, the residual lignins isolated from the pulps at kappa levels 50, 35, 20 and 15 were analyzed by different analytical techniques, including 2D-NMR, 31P-NMR and SEC (size exclusion chromatography). In addition, dissolved lignins precipitated from the black liquors of the kraft and soda-AQ processes at kappa 20 and 15 were also analyzed. The distribution of the different lignin substructures in the residual lignins was similar to that in the native lignin, although with a drastic reduction in their content. This reduction was more evident in pulps with lower kappa number due to the more drastic pulping conditions.
显示更多 [+] 显示较少 [-]The research leading to these results has received funding from the European Community's Seventh Framework Programme FP7/2007-2013 under grant agreement no KBBE-2009-3-244362 LignoDeco (EU/Brazil co-operation). We thank Suzano Papel e Celulose (Brasil) for providing the pulps and the black liquors.
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