Formulation Design of Liquid Explosives - Liquid Explosives - page 125

where, Q 0 1 ; 3 is the total of formation heat of all products from the complete com-
bustion, Q 0 2 ; 3 is combustion heat of the explosive, which is the calculated value
from Eq. 3.17 , i.e., Q pm .
In order to calculate the fusion heat and evaporation heat of the material, the
following approximate method can be used to calculate.
Fusion heat of some explosives can be calculated as the following:
In organic explosives (or compounds),

q fus ¼ 0 : 0135T fus ð 3 : 18 Þ

Inorganic explosives (or compounds),

q fus ¼ 0 : 006T fus ð 3 : 19 Þ

Simple material,

q fus ¼

: ð : Þ

0 0025T fus 3 20

Vaporization Heat of some explosives can be obtained as the following:
In nonpolar liquid,

q vap ¼ 0 : 213T bp ð 3 : 21 Þ

where,
T fus melting point, K,
T bp boiling point, K.

In order to further show the formation heat of liquid explosives, combustion heat
and formation heat of nitroglycerine will be calculated in detail as an example.
The formula of nitroglycerin is known as C 3 H 5 (ONO 2 ) 3 , where, a =3,b = 5 and
p = 3. As listed in Table 3.9 , the correct value of R-ONO 2 is 0. Therefore, according
to Eq. 3.17 , the combustion heat of nitroglycerine is,

Q c ¼ 26 : 05 ð 3 4 þ 5 3 Þ þ 0 ¼ 26 : 05 14 ¼ 1525 : 9kJ

Then, formation heat of nitroglycerine can be calculated according to Hess ' s

law.
The combustion reaction equation of nitroglycerine is,

C 3 H 5 ONO 2 ð Þ 3 ! 3CO 2 þ 2 : 5H 2 O þ 1 : 5N 2 þ 1525 : 9kJ

Thus, the formation heat of nitroglycerine is,