Potassium Persulfate
Potassium persulfate is a white, finely crystalline, odourless salt consisting of
Potassium Persulfate is a white, finely crystalline, odourless salt consisting of technically pure potassium peroxodisulfate and silicic acid to enhance the free flowing properties. It is used as an initiator (source of free radicals) for the polymerisation of monomers and as a strong oxidising agent in many applications. It has the particular advantage of being only slightly hygroscopic and easy and safe to handle. As a result of the process used for its production it is free from contamination by ammonium ions. As a result of its extremely high purity it has a good storage stability. Due to its fine crystallinity potassium peroxodisulfate tends to lumping.
Polymerisation:
Initiator for the emulsion or solution polymerisation of acrylic monomers, vinyl acetate, vinyl chloride etc. and for the emulsion copolymerisation of styrene, acrylonitrile, butadiene etc. Dosage: 0.1-0.5% KPS-5 (PPS). Temperature: 75-95°C. In combination with redox systems (ascorbic acid, Rongalit, sulfites or sugar - possibly in combination with heavy metal salts such as Fe2+ it can also be used for polymerisation reactions carried out at lower - and even at ambient - temperatures. To reduce the residual monomer content, a combination of KPS-5 (PPS) with TBHP-70-AQ is recommended, particularly in cases where redox systems are used.
Cosmetics: Essential component of bleaching formulations.
Paper: Modification of starch; Repulping particularly of wet-strength paper.
Textile: Desizing agent and bleach activator - particularly for cold bleaching (e.g. bleaching of Jeans).
Others:
- Chemical synthesis
- Water treatment (decontamination)
- Waste gas treatment; oxidative degradation of harmful substances (e.g. Hg)
| Appearance | White, finely crystalline salt |
| KPS (PPS) content (typically) | 99.0 % w/w |
| Active oxygen (typically) | 5.9 % w/w |
| Acid content (based on H2SO4,typically) | 0.05 % |
| Iron content (typically) | 1 mg/kg |
| Bulk density (typically) | 1100 g/l |
| Melting point | Decomposition At above 65 °C |
| Solubility in water at 10/20/40/60°C | 30/50/105/210 g/l |
| pH of a 1% solution in water (typically) | 3.7 |
| pH of a 10% solution in water (typically) | 3.1 |
| Recommended storage temperature | Below 30 °C |
| Moisture content (typically)% | < 0.03 |
| Molecular Weight | 270.3 kg/kmol |
|
Specific Gravity |
2,480 kg/m³ |
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