Miguel A. Gilarranz, Francisco Rodríguez, Mercedes Oliet
Lignin Behavior During the Autocatalyzed Methanol Pulping of Eucalyptus globulus Changes in Molecular Weight and Functionality
Summary
The molecular weight distribution and functional group contents (phenolic and carbonyl) of lignin samples
from the autocatalyzed pulping of Eucalyptus globulus wood were determined. A total of 17 pulping
runs were carried out at different conditions according to a surface response design experimental
matrix (central composite). The influence of pulping temperature (170–200°C), pulping time
(40–120 min) and methanol concentration (30–70%, w/w) on the characteristics of the isolated lignins
was studied. Empirical models were developed and used to predict the lignin properties as a function of
the cooking conditions. Under high temperature, long cooking time and low alcohol concentration, a rise
in functional groups content and a drop in molecular weight of lignin
Holzforschung, Walter de Gruyter
Print ISSN: 0018-3830
Volume: 54, 07/2000
Pages: 373 - 380
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