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Journal of Thermal Analysis and Calorimetry

, Volume 112, Issue 3, pp 1335–1341 | Cite as

Accelerating rate calorimeter studies of water-induced thermal hazards of fireworks tip mixture

  • Vethathiri Pakkirisamy Sridhar
  • Mahadevan Surianarayanan
  • Suthangathan Paramashivan Sivapirakasam
  • Asit Baran Mandal
Article

Abstract

The objective of this article is to generate thermal decomposition data on fireworks tip mixture, a mixture used to coat the tip of fireworks, for easy ignition. This mixture has reportedly involved in triggering many accidents in fireworks industry. Different quantities of water were added to the mixture and its thermal characteristics were studied. Differential scanning calorimeter was used for screening tests and accelerating rate calorimeter was used for detailed studies in adiabatic and isothermal modes. The self-heat rate data obtained showed onset temperature for different quantity of water, at a range of 80–170 °C. The mixture with 40 % water wt/wt had onset at 80 °C in adiabatic mode. The same mixture on isoaging at 40 °C exhibited exothermic characteristics with a substantial rise in system pressure (57 bar). The heats of exothermic decomposition and Arrhenius kinetics were also computed.

Keywords

Fireworks tip mixture Differential scanning calorimeter Accelerating rate calorimeter Self-heat rate Thermal decomposition Heats of reaction 

Abbreviations

KNO3

Potassium nitrate

BaNO3

Barium nitrate

Al

Aluminum

C

Concentration

T

Temperature/°C

T0

Initial temperature/°C

TF

Final temperature/°C

Hr

Heat of reaction/J g−1

ϕ

Thermal inertia

ΔT

Temperature difference/°C

ΔTad

Corrected temperature difference/°C

mS

Mass of sample/g

mB

Mass of bomb/g

k

Rate coefficient

mT

Rate of temperature increase/°C min−1

k*

Pseudo rate constant

Ea

Activation energy/kC mol−1

R

Universal gas constant

A

Pre-exponential factor/s−1

\( \bar{C}_{\text{p}} \)

Average heat capacity/J g−1 K−1

\( \bar{C}_{\text{ps}} \)

Average heat capacity of sample/J g−1 K−1

\( \bar{C}_{\text{pB}} \)

Average heat capacity of bomb/J g−1 K−1

Notes

Acknowledgements

The authors are thankful to Prof NR Rajagopal for his encouragement. One of the authors Sridhar VP thanks CSIR, New Delhi for SRF fellowship.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2012

Authors and Affiliations

  • Vethathiri Pakkirisamy Sridhar
    • 1
  • Mahadevan Surianarayanan
    • 1
  • Suthangathan Paramashivan Sivapirakasam
    • 2
  • Asit Baran Mandal
    • 1
  1. 1.Thermochemical Laboratory, Department of Chemical EngineeringCentral Leather Research Institute (CLRI)Adyar, ChennaiIndia
  2. 2.Department of Mechanical EngineeringNational Institute of TechnologyTiruchirapalliIndia

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