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The Long-term Stability of Sodium Percarbonate in Presence of Zeolite as Measured by Heat Flow Calorimetry

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Published/Copyright: March 30, 2013
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Tenside Surfactants Detergents
From the journal Tenside Surfactants Detergents Volume 44 Issue 4

Abstract

Heat flow calorimetry has been evaluated as an alternative technique to conventional stability testing of sodium percarbonate [15630-89-4] (SPC) based on analysis of the hydrogen peroxide content. Stability tests were performed with different SPC samples as well as under various experimental conditions. In general, stable samples exhibiting high concentration of hydrogen peroxide were accompanied by low heat flow values. It was found that the results obtained by heat flow calorimetry and conventional stability testing were in agreement. It was also demonstrated that the long-term stability could be predicted from heat flow data obtained during the initial stage of decomposition. Furthermore, different manufacturing and experimental conditions were manifested as a change of the heat flow curve. The results indicate that the rate of heat production is closely associated with the stability of sodium percarbonate, i. e. the rate of decomposition of sodium percarbonate. In presence of zeolite the stability of sodium percarbonate was reduced, particularly under humid conditions.

Kurzfassung

Untersucht wurde die Wärmeflusskalorimetrie als Alternativmethode zu herkömmlichen Stabilitätstests von Natriumpercarbonaten [1563-89-4] (sodium percarbonate – SPC), die auf der Bestimmung des Gehalts an Wasserstoffperoxid basieren. Die Stabilitätstests wurden sowohl an Proben mit unterschiedlichem Gehalt an SPC als auch unter verschiedenen Versuchsparametern durchgeführt. Stabile Proben, die sich durch einen hohen Gehalt an Wasserstoffperoxid auszeichnen, zeigen einen niedrigen Wärmefluss. Es wurde gezeigt, dass die mit der Wärmeflusskalorimetrie ermittelten Daten mit denen aus herkömmlichen Stabilitätstests übereinstimmen. Es wurde ebenfalls gezeigt, dass die Wärmeflussdaten zu Beginn der Zersetzungsreaktion Aussagen über die Langzeitstabilität der Proben erlauben. Des weiteren wirken sich unterschiedliche Herstellungsbedingungen und unterschiedliche Versuchparameter auf Form und Verlauf der Wärmeflusskurven aus. Die Ergebnisse zeigen, dass die Wärmefreisetzungsrate eng mit der Zersetzungsrate des Natriumpercarbonates korreliert. Bei Anwesenheit von Zeolithen – speziell unter feuchten Bedingungen – wird die Stabilität des SPC erniedrigt.

Key words:: Sodium percarbonate; 15630-89-4; bleaching agent; hydrogen peroxide; stability; microcalorimetry; heat flow calorimetry
Stichwörter:: Natriumpercarbonat; 15630-89-4; Bleichmittel; Wasserstoffperoxid; Stabilität; Mikrokalorimetrie; Wärmeflusskalorimetrie
∗ Dr. Dan Forsström, Bodycote Materials Testing AB, Box 431, SE-691 27 Karlskoga, Sweden, Phone: +46-7 34 18 91 21. E-mail:

Cecilia Johansson has a University Certificate in Chemical Engineering at the Institute of Technology, Lund, Sweden. Since 2003 Cecilia is employed as a Development Engineer at Kemira Kemi AB in Helsingborg responsible for the development of new methods for stability testing of detergents.

Pentti Pekonen is research scientist (PhD, University of Oulu) and has been working for Kemira Oyj Research Centre at Oulu and at Helsingborg since 1996. Research activities have included, among others, development of active oxygen compounds. Focus on previous academic research activities were the chemistry of non-metals, analytical and synthetic chemistry at the university.

Dan Forsström is educated in chemistry at KTH, Sweden and holds a doctors degree in polymer technology. The subject of the thesis work was degradation and stabilisation of polymers including the study of various rate sensitive techniques for monitoring the rate of degradation of polymers. Dan has used heat flow calorimetry and other rate sensitive analytic techniques since 1988 in order to study the rate of physical processes and chemical reactions.

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Received: 2006-11-09
Published Online: 2013-03-30
Published in Print: 2007-08-01

© 2007, Carl Hanser Publisher, Munich

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https://doi.org/10.3139/113.100340
Keywords for this article
Sodium percarbonate; 15630-89-4; bleaching agent; hydrogen peroxide; stability; microcalorimetry; heat flow calorimetry

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Abstracts
  4. Abstracts
  5. Application
  6. Influence of Polymer Architecture on the Stabilization of Iron and Manganese Ions in Aqueous Systems
  7. The Long-term Stability of Sodium Percarbonate in Presence of Zeolite as Measured by Heat Flow Calorimetry
  8. A Novel Method for the Synthesis of Mesoporous TiO2 at Ambient Temperature
  9. Sanitary Ware with Easy Cleaning and/or Antibacterial Properties
  10. Novel Surfactants
  11. Synthesis and Characterization of a Series of Novel Anionic Fumaric Polymerizable Surfactants
  12. Physical Chemistry
  13. Interfacial Tensions, Partition Coefficients, and Interfacial Elasticities: Measures for Emulsion Stability?
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