CORRELATION OF FIRE HAZARD CHARACTERISTICS WITH CHEMICAL STRUCTURE. XV. THIOETHERS

The correlation of chemical structure and fire-dangerous properties is studied in number of thioethers. It is shown, that for these compounds the carbon rule which allows to predict their physicochemical and fire-dangerous properties well works. Empirical equations of calculation are offered for boiling point (BP (K) = 142,14 + 113,12NÑ 0 5, ; BP (K) = 95,74 + 99,38 0,5; ÂP (K) = 89,38 + 459,68Ñs 0 5, ), critical pressure (Pc (atm) = 8,47 – 1,6 ln NÑ) 2 , critical temperature (Òc (K) = 350,48 + 105,98NÑ 0, 5 ), lower and upper flammability limit (LFL (%) = 0,25NÑ + 87,6
NÑ 0 5, – 120,09
NÑ + 72,14
NÑ 2 –18,23; UFL (%) = 33,86
NÑ 0 78 , ), lower and upper flammability limit temperature (LFLT (K) = (12,18 + + 2,14 NÑ 05 2 , ) ; UFLT (K) = (13,26 + 2,18NÑ 0 5, ) 2 ), heat of combustion (Ícomb · 103 (kJ
mole) = 0,42 + + 0,63NÑ), flash point (FP (K) = (12,13 + 2,17NÑ 0 5, ) 2 ; FP (K) = 82,39 + 68,990,5; FP (K) = 78,09 + + 319,05
Ñs 0 5, ; ÒÂ (K) = 0,51BP (K) + 4,03NÑ+ 68,96). For normal thioethersNÑ is number of carbon atoms;  = NÑ+NS+NH
4, whereNS,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 * — pseudo-stoichiometric concentration.