CORRELATION OF FIRE HAZARD CHARACTERISTICS WITH CHEMICAL STRUCTURE. XIII. ALKYLTHIOLS

The correlation of chemical structure and fire-dangerous properties is studied in number of thioalkanes. It is shown, that for these compounds the carbon rule which allows to predict their physico-chemical and fire-dangerous properties well works. The empirical equations of calculation are offered for refraction index (nD = 1,499 – 0,109
lnNÑ + 0,42
NÑ 1 5, – 0,368lnNÑ
NÑ 2 ), boiling point (BP(Ê) = 245,4 – 0,74NÑ 2 + 34,1NÑ; BP(Ê) = 224,9 + 17,11,5 – 4,652 + 0,372,5; BP(Ê) = 88,95 + + 466,93
Ñs 0 5, ), critical pressure (Pc(atm) = 70,25 – 21,9 lnNÑ), flash point (FP(Ê) = 0,021[BP(Ê)]1,5 + + 122,59; FP(Ê) = 205,24 – 0,26NÑ 2 + 18,76NÑ; FP(Ê) = 347,9 + 0,62 – 0,082,5 – 347,3 ln
; FP(Ê) = 88,95 + 466,93
Ñs 0 5, ; FP(Ê) = 0,168BP(Ê) + 11,03NÑ + 170) and lower flammability limit (LFL(%) = 4,44NÑ 0 83 , ). For normal thioalkanes NÑ is number of carbon atoms; = NÑ + NS + NH
4, where NS, NH — number of sulfur and hydrogen atoms respectively; Cs — stoichiometric concentration. For isomeric compounds NÑ is the conditional carbon chain (CCC), determined in accordance with carbon rule, * — pseudofactor, * = CCC + NS + (2CCC + 2)
4, Cs * — pseudostoichiometric concentration.