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

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.

[1]  T. Lindblom,et al.  Reactions in the System Nitro-cellulose/ Diphenylamine with Special Reference to the Formation of a Stabilizing Product Bonded to Nitro-cellulose , 2004 .

[2]  B. Terselius,et al.  Oxidation of unstabilised polypropylene particles as studied by microcalorimetry and chemiluminescence techniques , 2003 .

[3]  N. Wingborg,et al.  2,2‐Dinitro‐1,3‐Bis‐Nitrooxy‐Propane (NPN): A New Energetic Plasticizer , 2002 .

[4]  W. Rybinski,et al.  Microcalorimetric investigations of detergent ingredients , 2002 .

[5]  S. Gaisford,et al.  Potential applications of microcalorimetry for the study of physical processes in pharmaceuticals , 2001 .

[6]  J. Mitchell,et al.  The stability of benzoyl peroxide formulations determined from isothermal microcalorimetric studies. , 2001, International journal of pharmaceutics.

[7]  Chi-Min Shu,et al.  Exothermic decomposition of cumene hydroperoxide at low temperature conditions , 2001 .

[8]  S. Gaisford,et al.  Thermodynamic and kinetic parameters from isothermal heat conduction microcalorimetry , 1998 .

[9]  G. Buckton.  Applications of isothermal microcalorimetry in the pharmaceutical sciences , 1995 .

[10]  L. Paulsson.  Oxidation of polyethylene monitored by microcalorimetry at 70°C , 1993 .

[11]  H. Nyqvist,et al.  Saturated salt solutions for maintaining specified relative humidities. , 1983 .

[12]  P. Paloniemi,et al.  Theory of Equalization of Thermal Ageing Processes of Electrical Insulating Materials in Thermal Endurance Teste III. Tests Results on an Enamelled Wire, a Polyester Glass Laminate and an Epoxy Casting Resin , 1981, IEEE Transactions on Electrical Insulation.

[13]  Paavo Paloniemi,et al.  Theory of Equalization of Thermal Ageing Processes of Electrical Insulating Materialsin Thermal Endurance Tests I: Review of Theoretical Basis of Test Methods and Chemical and Physical Aspects of Ageing , 1981, IEEE Transactions on Electrical Insulation.