Anthraquinone (Kraft Pulping Additive)
CAS Number: 84-65-1
Anthraquinone (AQ) is a highly effective pulping additive used in kraft and soda pulping processes to accelerate delignification and protect cellulose from degradation. Even at very low dosage levels (0.05–0.1% on o.d. wood), it significantly increases pulp yield and reduces the kappa number of unbleached pulp. Anthraquinone acts as a redox catalyst, shuttling electrons between lignin and carbohydrates.
Technical Specifications
| appearance | Yellow to orange fine powder |
| purity (%) | ≥ 99 |
| melting point (°C) | 284–286 |
| moisture content (%) | ≤ 0.3 |
| particle size (μm, d90) | ≤ 50 |
Applications
- Kraft (sulfate) pulping yield and kappa improvement
- Soda and soda-AQ pulping of non-wood fiber crops
- Reduction of cooking chemical consumption
- Organosolv pulping process accelerant
- Bamboo and bagasse pulping additive
Key Features
- Catalytic action at very low dosage (0.05–0.1% on wood)
- Increases pulp yield by 1–3% while improving kappa number
- Reduces energy consumption through shorter cooking cycles
- Compatible with kraft, soda, and modified cooking processes
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