Sodium Hypochlorite Solution (Pulp Bleaching Grade)
CAS Number: 7681-52-9
Sodium hypochlorite is a chlorine-based oxidizing bleaching agent used in the bleaching of chemical and mechanical pulps. It effectively removes residual lignin and chromophores, increasing pulp brightness. In modern elemental chlorine-free (ECF) bleaching sequences, it can serve as a supplemental brightening stage alongside chlorine dioxide and peroxide.
Technical Specifications
| pH | 11–13 |
| appearance | Clear greenish-yellow liquid |
| density (g/mL, 20°C) | 1.15–1.21 |
| available chlorine (%) | 10–15 |
Applications
- Bleaching of kraft and sulfite chemical pulps
- Hypochlorite extraction stage in multi-stage bleaching
- Brightening of dissolving pulp and specialty fibers
- Bleaching of recycled fiber for deinked pulp
- Mill sanitation and microbiological control
Key Features
- Effective lignin oxidation and brightness gain per unit cost
- Widely available and easy to handle in liquid form
- Adjustable concentration for different bleaching stages
- Can be combined with sodium hydroxide for alkaline extraction
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