The shelf life of amine based liquid propellant was predicted using Berthelot and Arrhenius approaches and the results were compared. Reduction of the triethylamine concentration to less than 48 wt‐% was taken as the end of shelf life. The γ10 parameter and the activation energy of the Berthelot and Arrhenius approaches were determined to be 1.99 and 64.07 kJ mol−1, respectively. According to the experimental data, the fuel shelf life at 293, 303, and 313 K, was predicted to be 5.7, 2.4, and 1.06 years using Arrhenius; and 3.93, 2, and 1 years using Berthelot approach, respectively. Results showed that the results that Berthelot approach gives lower values for fuel shelf life at ambient temperatures but it gives higher values at higher temperatures. Considering the safety aspect, the lower values are recommended as shelf life of the fuel.
The storage stability of amine based rocket fuel called Samine was studied over 9 months for the first time. It was found that storage stability significantly depends on fuel oxidation with the air trapped in the storage tanks. A reduction of the triethylamine concentration from 50.2 % (wt) to less than 48 % was taken as the end of shelf life of the propellant. After obtaining experimental data from accelerated storage stability tests, the shelf life of Samine was estimated using the Arrhenius equation. According to the kinetic studies, the oxidation reaction of fuel was a zero order reaction and the shelf lives of Samine in stainless‐steel tanks at 20 °C, 25 °C, and 30 °C were obtained to be 5.7, 3.7, and 2.4 years, respectively. Additionally, it was observed that for long time storage of amine based fuels like Samine it is better to use stainless‐steel or aluminum tanks, which are charged with an inert gas like nitrogen.
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