关键词: 喷气燃料, 枝孢霉菌, 总酸值, 降解机理

Abstract:  Using the dry weight of mycelium as indicator, orthogonal experiments were carried out to optimize the growth conditions of the jet fuel dominant fungus Amorphotheca Resinae (A. resinae), and to study the effects of A. resinae on the total acid value and the silver strip corrosion of jet fuel. Taking n-dodecane as the model compound of jet fuel, the growth process of A. resinae, degradation rate， intermediates and mechanism of n-dodecane were investigated by GC and GC-MS. The experiments show that the optimal growth temperature of A. resinae is 25 ℃, the initial pH value is 8.0 and the sodium mass concentration is 200.0 mg/L. Moreover, it is found that the A. resinae significantly increases the total acid value and reduces the surface tension of jet fuel. However，it has no significant effect on the silver strip corrosion and water reaction of jet fuel. Lastly, we found that A. resinae degrades n-dodecane by a single terminal oxidation pathway, which oxidizes n-dodecane to 2-dodecene, 2-dodecen-1-ol, and 2-dodecenoic acid.

Key words:  jet fuel, Amorphotheca Resinae, total acid number, degradation mechanism