Sodium Hydroxide (Pulping & Bleaching Grade)
CAS Number: 1310-73-2
Sodium hydroxide (caustic soda) is a fundamental chemical in pulp and paper manufacturing, used in kraft pulping as part of white liquor, in alkaline extraction stages during bleaching, and in pH adjustment throughout the papermaking process. It dissolves lignin from wood chips during cooking and facilitates the regeneration of pulping chemicals in the kraft recovery cycle.
Technical Specifications
| appearance | White flakes, pellets, or 50% aqueous solution |
| Fe content (ppm) | ≤ 10 |
| NaCl content (%) | ≤ 0.05 |
| NaOH content (%) | ≥ 99 (solid) / 50±1 (solution) |
| Na₂CO₃ content (%) | ≤ 0.5 |
Applications
- Kraft pulping white liquor component (NaOH + Na₂S)
- Alkaline extraction (E, Ep, Eop) stages in bleaching
- pH adjustment in paper wet end and bleaching plant
- Caustic peroxide brightening of mechanical pulp
- Chemical recovery and green liquor causticizing
Key Features
- Essential chemical for kraft pulping and recovery cycle
- Enables alkaline extraction of lignin in bleaching sequences
- High purity grades available for sensitive bleaching stages
- Available as solid flakes or as concentrated liquid solution
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