pKa-Values of Guaiacyl and Syringyl Phenols Related to Lignin |
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| Authors: | Martin Ragnar Christofer T Lindgren Nils-Olof Nilvebrant |
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| Affiliation: | 1. Kungliga Tekniska H?gskolan (KTH), Institutionen f?r Pappers- och massateknik, Tr?kemi , SE-100 44, STOCKHOLM, Sweden;2. Kungliga Tekniska H?gskolan (KTH), Institutionen f?r Pappers- och massateknik, Cellulosateknik , SE-100 44, STOCKHOLM, Sweden;3. Skogsindustrins Tekniska Forskningsinstitut (STFI) , Box 5604, SE-114 86, STOCKHOLM, Sweden |
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| Abstract: | Abstract The literature relating to the pKa -values of guaiacyl- and syringyl-derived phenols has been thoroughly surveyed and summarized. In addition, the pKa -values of a number of guaiacyl, syringyl and other phenols related to lignin have been determined using a spectrophotometric method combined with multivariate evaluation. Differences and similarities between the acidities of a number of substances are extensively discussed. The pKa -value strongly affects the delignification during pulping, bleaching and leaching of lignin during pulp washing. |
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