Peracetic Acid (TCF Bleaching Agent)
CAS Number: 79-21-0
Peracetic acid (PAA) is an oxidative bleaching agent used in totally chlorine-free (TCF) pulp bleaching sequences. It effectively removes residual lignin and brightens pulp without generating chlorinated compounds in the effluent, making it highly suitable for environmentally sensitive kraft and sulfite pulp applications. PAA is also used for microbiological control in paper mill white water systems.
Technical Specifications
| pH | < 2.0 |
| appearance | Colorless to pale yellow liquid |
| acetic acid content (%) | 10–35 |
| peracetic acid content (%) | 5–40 |
| hydrogen peroxide content (%) | 5–30 |
Applications
- TCF bleaching of kraft and sulfite dissolving pulp
- Peroxide-reinforced alkaline extraction stage (Epa stage)
- Brightening of specialty and dissolving grade pulps
- Microbiological control in paper machine white water
- Supplemental oxidative bleaching in ECF sequences
Key Features
- Chlorine-free oxidant for truly TCF pulp bleaching
- Decomposes to acetic acid and water — no persistent residues
- Effective against lignin and chromophores at moderate temperatures
- Dual-function: bleaching and biocide in white water
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