Reactions of Conventional Kraft and Superbatch Pulp Residual Lignins with Peroxyformic Acid
| Autor: | Bo Hortling, Kristiina Poppius-Levlin, Petri Widsten |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Softwood
Chemistry Methyl formate General Chemical Engineering Pulp (paper) technology industry and agriculture food and beverages macromolecular substances General Chemistry engineering.material complex mixtures chemistry.chemical_compound Kraft process Reagent engineering Organic chemistry Lignin General Materials Science Solubility Kraft paper |
| Zdroj: | Journal of Wood Chemistry and Technology. 23:305-323 |
| ISSN: | 1532-2319 0277-3813 |
| DOI: | 10.1081/wct-120026994 |
| Popis: | The residual lignins KRL and SRL, isolated from a conventional kraft pulp and a SuperBatch pulp respectively, were reacted with peroxyformic acid (PFA). The reagent consumptions were determined and the products fractionated according to their solubility. Both lignins consumed a roughly equal amount of PFA, which was nearly 50% higher than that consumed by kraft lignin. The undissolved fractions of PFA-treated residual lignins (yield >80%) contained less aromatic units, phenolic hydroxyl and methoxyl groups, and considerably more carboxyl groups (including those of formate esters) than the untreated lignins. The extent of these modifications was approximately equal for KRL and SRL, which together with the similar PFA consumptions and product yields of KRL and SRL indicates that the two residual lignins showed no essential difference in reactivity toward PFA. The effect of fiber wall morphology on delignification efficiency during PFA delignification is suggested to be small because of the cleavage... |
| Databáze: | OpenAIRE |
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