СORRELATION OF FIRE HAZARD CHARACTERISTICS WITH CHEMICAL STRUCTURE. IX. CHLOROALKANES

The correlation of chemical structure and fire-dangerous properties is studied in number of aliphatic chloroalkanes. The carbon rule well works for these compounds. It is allowed to predict their physicochemical and fire-dangerous indices. The empirical equations of calculation are offered for: boiling point (TB(K) = –0,716NC 2 + 35,078NC + 220), TB(K) = –0,31842 + 23,386 + 220, TB(K) = = 202,3 + 590,34
Ñs – 320,01
Ñs 2 + 90,92
Ñs 3 ); flash point (FP(K) = –0,595NC 2 + 24,03NC + 206,4; FP(K) = 189 + 7,721,5 – 0,6322,5 + 0,083 ; FP(K) = 198,5 + 64,99
Ñs + 774,8
Ñs 2 – 1093,01
Ñs 3 + + 443,29
Ñs 4 ; FP(K) = –0,83NC + 0,67TB(K) + 34); low explosive limits (LEL(%) = 0,045NC 0,5 + + 8
NC – 0,59
NC 1 5, – 0,2); refractive index (nD = 1,4736 – 0,5079
NC + 0,5079
NC 1 5, – 0,1544
NC 2 ; nD = 1,489 – 0,166
0,5 – 0,134
+ 0,169
2 , nD = 1,555 + 0,012Ñs – 0,104Ñs 0 5, – 0,045exp (– Ñs)); heat of vaporization (Hv (kJ
mole) = 10,984NC 0 5, + 9,93). NÑ is number of carbon atoms, = 1,5NÑ, Ñs is the stoichiometric concentration, Ñs = 100
(1 + 4,76) for normal chloroalkanes. NÑ is the conventional hydrocarbon chain for compounds of isostructure. In the modified Ormandy–Craven's formula the values of coefficients a (0,630) and b (57,53) are improved for this number of organic compounds.