scholarly journals Reliable predictions of the net heat of combustion and the condensed phase heat of formation of organosilicon compounds

Fuel ◽  
2022 ◽  
Vol 307 ◽  
pp. 121931
Author(s):  
Mohammad Hossein Keshavarz ◽  
Ronak Hasani
2021 ◽  
Vol 11 (4) ◽  
pp. 8-15
Author(s):  
Łukasz Jęczmionek

The results of the research on estimation the molar heat of formation (enthalpy) of model triglycerides found in natural oils and fats are presented. In this work a calculation method and calorimetric one were used. It was found that combustion heat values determined by separate methods are comparable; their difference was a maximum of 155 kJ/kg, and thus was significantly lower than the tolerance for the calorimetric method according to PN 86/C-04062.


2016 ◽  
Vol 81 (6) ◽  
pp. 687-695
Author(s):  
Dany Frem

Four types of nitrogen-rich heterocycles substituted with -NO2, -NHNO2 and -C(NO2)3 explosophoric groups were explored as potential explosives and propellants materials. The calculated crystal density (?0)and the condensed phase heat of formation (?H?0f)for each of the twelve structures investigated shows that all these derivatives possess high (1.834-1.980 g cm-3)(?H?0f) and (605-2130 kJ kg-1) values. Interesting properties such as detonation velocity (D), pressure (P) and specific impulse (Isp) were calculated using the Kamlet-Jacobs method and ISPBKW thermochemical code. Detonation velocity and pressure in excess of 8.44 km s-1 and 32.87 GPa was obtained in all cases. Furthermore, trinitromethyl substituted derivatives shows performance exceeding that of HMX with an estimated D = 9.32-9.72 km s-1 and P = 40.61-43.82 GPa. Some -NO2 and -NHNO2 substituted derivatives were shown to be impact insensitive while retaining good detonation performance and thus are regarded as potential replacement for current RDX -based explosives. Finally, the calculated specific impulse (Isp between 248 and 270 s) of all investigated derivatives indicate that these energetic materials can be considered as possible ingredient in future rocket propellant compositions.


1972 ◽  
Vol 50 (18) ◽  
pp. 2935-2938 ◽  
Author(s):  
M. Krech ◽  
S. J. W. Price ◽  
W. F. Yared

A new method has been developed for determining the heat of combustion of perfluoro aromatic compounds. The basic differences from previous methods are that no auxiliary substance is used and no water is present in the bomb. The combustion of hexafluorobenzene in a platinum lined bomb yields CO2, CF4, and F2. Visual inspection and the material balance indicate that complete combustion is obtained. The value of [Formula: see text] obtained by this method is −224.0 ± 2.0 kcal/mol. Recalculation of the result of Cox etal. (1, 2) obtained from combustion of C6F6 in mylar bags in the presence of hydrocarbon oil and water leads to[Formula: see text]


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