Quinones As Additives During Soda Cooking |
| |
Authors: | Ulf Carlson Olof Samuelson |
| |
Affiliation: | Chalmers University of Technology, Department of Engineering Chemistry , Gothenburg, Sweden |
| |
Abstract: | Anthraquinone-1-acetic acid is a less effective delignification catalyst than anthraquinone but it gives an enhanced carbohydrate stabilization by converting reducing sugar end groups more effectively to aldonic acid end groups. This reaction produces the hydroquinone form of the additive which is then easily oxidized by oxygen at 80°C. Oxygen treatment favors the end group stabilization. Depolymerization of the cellulose is suppressed by the presence of magnesium hydroxide but cannot be avoided completely. |
| |
Keywords: | Eucalyptus globulus handsheet kraft pulping pulpability wood anatomy |
|