Experimental and Сomputational-Analytical Studies of the Compatibility of Combustible Substances with Each Other and with Oxidants


Annotation:

The danger of chemical reactions in the interaction of incompatible substances manifests itself in an increase in temperature and pressure, ignition, and finally, these reactions can be accompanied by an explosion.
By the method of a constant volume bomb, the processes of interaction of mutually reacting substances are studied, as which mixtures of combustible substances (sodium, magnesium, sulfur, and an organic liquid — glycerin) with a changing mass of the oxidizer (ammonium nitrate, ammonium perchlorate, potassium permanganate, potassium bichromate) and in a mixture of these substances of stoichiometric composition are studied: a combustible component and an oxidizer.
Analysis of the dependences of the coefficient of participation of a substance in an explosion on the coefficient of excess of an oxidizer of various interacting substances indicates that these dependences can be of two types: with an extremum and in the form of a direct dependence. Continuous increase in the coefficient of participation in the explosion with an increase in the coefficient of excess of the oxidizer indicates the ability to decompose and participate in the explosion of the oxidizer itself. This type of dependence established experimentally for the powders of combustible sulfur and magnesium with oxidizing agents-ammonium nitrate and ammonium perchlorate, shows that both combustible and decomposition products of a flammable oxidizing substance participate in the explosion. Other mixtures (magnesium, glycerin mixed with potassium permanganate, potassium bichromate) have an extremum, and the oxidizer does not participate in the pressure increase when the oxidizer content in the mixture increases.
Calculation confirms the possibility of determining chemical compatibility (incompatibility) of substances using the standard Gibbs energy. Based on the example of the experimentally established incompatibility of mixtures of magnesium and sulfur with ammonium nitrate, the calculation also shows that these substances are incompatible with each other.
In the absence of experimental data on the compatibility of substances, the input data for calculating the Gibbs energy, the information on the compatibility (incompatibility) of substances can be borrowed from tables 15–17 of GOST 12.1.004. Hazardous and especially hazardous substances indicated under numbers 3 and 4 in these tables are incompatible.

References:
1. GOST 12.1.044—89. Оccupational safety standards system. Fire and explosion hazard of substances and materials. Nomenclature of indices and methods of their determination. Available at: https://docs.cntd.ru/document/1200004802 (accessed: April 2, 2021). (In Russ.).
2. Zemskiy G.T., Vogman L.P., Maslennikov V.V., Zuykov V.A., Zenin V.A. Determination of categories of the premises for fire and explosion hazard, in which mutually reactive substances are circulating. Pozharovzryvobezopasnost = Fire and Explosion Safety. 1993. Vol. 2. № 4. pp. 28–31. (In Russ.).
3. SP 7.13130.2013. Heating, ventilation and conditioning. Fire safety requirements. Available at: https://docs.cntd.ru/document/1200098833 (accessed: April 2, 2021). (In Russ.).
4. SP 12.13130.2009. Determination of categories of rooms, buildings and external installations on explosion and fire hazard. Available at: https://docs.cntd.ru/document/1200071156 (accessed: April 2, 2021). (In Russ.).
5. GOST R 12.3.047—2012. Occupational safety standards system. Fire safety of technological processes. General requirements. Methods of control. Available at: https://docs.cntd.ru/document/1200103505 (accessed: April 2, 2021). (In Russ.).
6. GOST 12.1.004—91. Occupational safety standards system. Fire safety. General requirements. Available at: https://docs.cntd.ru/document/9051953 (accessed: April 2, 2021). (In Russ.).
7. SP 484.1311500.2020. Fire alarm systems and automation of fire protection systems. Designing and regulations rules. Available at: https://docs.cntd.ru/document/566249686 (accessed: April 2, 2021). (In Russ.).
8. Sax N.I. Dangerous properties of Industrial Materials. New York: Van Nostrand Reinhold, 1984. 3124 p.
9. Knunyants I.L. Chemical Encyclopedia. In 5 volumes. Moscow: Sovetskaya entsiklopediya, 1988. (In Russ.).
10. Vogman L.P., Shmurnov P.V. Ensuring fire safety of the local suction systems. Calculation methods. Pozharovzryvobezopasnost = Fire and Explosion Safety. 2008. Vol. 17. № 5. pp. 64–69. (In Russ.).
11. Karapetyants M.Kh., Karapetyants M.L. Basic thermodynamic constants of inorganic and organic substances. Moscow: Khimiya, 1968. 472 p. (In Russ.).
12. Saushev V.S. Fire safety of chemical storage. Moscow: Stroyizdat, 1982. 128 p. (In Russ.).
13. GOST 19433—88. Dangerous goods. Classification and marking. Available at: https://docs.cntd.ru/document/901714253 (accessed: April 2, 2021). (In Russ.).
14. Korolchenko A.Ya. Fire and explosion hazard of substances and materials and means of extinguishing them: reference textbook. In 2 parts. Moscow: Pozhnauka, 2000. (In Russ.).
DOI: 10.24000/0409-2961-2021-12-18-23
Year: 2021
Issue num: December
Keywords : explosion interaction experiment glycerin combustibles metal ammonium nitrate compatibility oxidants sulfur ignition
Authors:
  • Vogman L.P.
    Vogman L.P.
    Dr. Sci. (Eng.), Chief Researcher FGBU VNIIPO EMERCOM of Russia, Balashikha, Russia
  • Zemsky G.T.
    Zemsky G.T.
    Cand. Sci. (Chem.), Lead Researcher FSBI VNIIPO EMERCOM of Russia, Balashikha, Russia
  • Zuikov V.A.
    Zuikov V.A.
    Cand. Sci. (Eng.), Lead Researcher FSBI VNIIPO EMERCOM of Russia, Balashikha, Russia