Thermal oxidation stability is an important parameter for jet fuel practical application. In this work, in order to evaluate the influence of deoxygenation on fuel stability, samples of typical fuels (JP-10 and RP-3) were subjected to deoxygenation by nitrogen purge and then subjected to accelerated thermal oxidation (180°C, 200°C, and 220°C). The parameters of hydroperoxide number, total acid number, size distribution of insoluble oxidation products, and concentration of remaining antioxidant (butylated hydroxytoluene, MIT) were monitored and analyzed. The results show that deoxygenation and thermal oxidation have very little influence on the fuel physical properties (density, net heating value, and kinematic viscosity). However, deoxygenation significantly reduces hydroperoxide number, total acid number, and remaining BHT concentration in the fuel after accelerated oxidation. Moreover, the deoxygenation treatment also inhibits the formation of soluble macromolecular oxidatively reactive species (SMORS) and insoluble oxidation products such as gums and deposits.

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通过脱氧处理增强喷气燃料的热氧化稳定性

热氧化稳定性是喷气燃料实际应用的重要参数。在这项工作中，为了评估脱氧对燃料稳定性的影响，典型燃料样品（JP-10 和 RP-3）通过氮气吹扫进行脱氧，然后进行加速热氧化（180°C、200° C 和 220°C）。监测和分析氢过氧化物值、总酸值、不溶性氧化产物的尺寸分布和剩余抗氧化剂（丁基化羟基甲苯，MIT）浓度的参数。结果表明，脱氧和热氧化对燃料物理性质（密度、净热值和运动粘度）的影响很小。然而，脱氧显着降低了氢过氧化物值、总酸值、以及加速氧化后燃料中剩余的 BHT 浓度。此外，脱氧处理还抑制可溶性大分子氧化反应性物质 (SMORS) 和不溶性氧化产物（如树胶和沉积物）的形成。