Sodium persulfate

Sodium peroxosulphate (short form NaPS, trade name sodium persulfate) is the salt of peroxodisulphuric acid. It is a strong oxidizer and radical donator for polymerisation. Due to its high oxidation potential it can cause ignition under certain conditions. NaPS is highly soluble in water, aqueous solutions show an acidic reaction and have limited stability (see table 1 - 3).

Unlike ammonium persulfate, NaPS is free of ammonium ions and causes fewer problems in wastewater treatment.


Applications

The most important application for NaPS is in the water-based emulsion polymerisation of organic monomers in aqueous systems. The monomers are either sufficiently soluble in water and precipitate during polymerisation or polymerisation takes place in an aqueous emulsion of the monomers, as with styrene-butadiene and Acrylonitrile.

Large quantities of NaPS are used for etching and pickling metal surfaces (copper and copper alloys). Etching thin copper coating is a key part in the production of printed circuit boards.


Other applications of NaPS

  • in the cosmetics industry as a booster for hair bleaches and an oxidizer in hair dyes
  • in the paper industry for re-pulping and de-inking
  • in order to recover metals and metal salts, for oxidative treatment of high grade metal ores
  • in the photographic industry for regenerating bleaching baths for color stock
  • in the textile industry for de-sizing
  • for the production of desinfectants
  • in-situ decontamination of industrial areas: degradation of chlorinated hydrocarbons

On request we produce NaPS with an anti-caking agent.
Our standard packing is in 25 kg PE-bags or big bags (FIBC).

Please contact us for detailed application-recommendations.

table 1

  Chemical / Product   Sodium persulfate
  Abbreviation   NaPS
  Chemical name   Sodiumperoxodisulphate
  Chemical formula   Na2S2O8
  CAS - Number   7775 - 27 -1
  Molecular weight   238,1 g/mol
  Appearance   wihte, crystalline
  Assay
  active oxygen content
  min. 99% NaPS
  min. 6,65%
  Bulk density   1200 - 1350 g/l

table 2

  Solubility
  Temp. (ºC)
  Sodium persulfate
  NaPS g/l solutuion
10 459
20 556
30 590
40 618
50 650
60 686

     table 3

    ph-Values
  (at 20 ºC)
  1 % solution 5,3  +-  0,2
For further data (stability, physiological properties, first aid, handling and storage) we refer to our separate information and our material safety data sheet.  Info Material

We will be pleased to answer specific questions personally.  sales@RheinPerChemie.com

 
Document last modified: 07.10.2011
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