现行喷气燃料总酸值滴定中甲苯替代溶剂的研究
Study on the Alternative Solvent of Methylbenzene in the Total Acid Number Titration of Current Jet Fuels.
作者信息
Chen Teng, Hao Jingtuan, Yan Hui, Ma Jun, Sun Yuanbao, Xu Xin, Tong Liping, Fei Yiwei
机构信息
Department of Aviation Oil and Material, Air Force Logistics Academy, Xuzhou 221000, China.
Key Laboratory of Mesoscopic Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China.
出版信息
ACS Omega. 2022 Feb 22;7(9):7957-7962. doi: 10.1021/acsomega.1c07015. eCollection 2022 Mar 8.
Evaluation of the acidic characteristics of a jet fuel, especially for the total acid number (TAN), is of great significance to ensure flight safety. Methylbenzene is commonly used as the titration solvent; however, it is poisonous and harmful to the environment. It is highly desirable to develop an alternative solvent for methylbenzene to extract the acidic compounds from the jet fuel during the determination of the TAN. Here, we develop a desirable alternative solvent of a mixed ethanol-water solution with the volume ratio of ethanol to water of 99:1, which exhibits a value of TAN similar to that of the solvent of methylbenzene in potentiometric titration and acid-base titration methods. The TAN value derived from the different titration solvents was in the order of 2.96 μg KOH g ( / / = 100:99:1) > 2.68 μg KOH g ( / / = 100:99:1) ≈ 2.6 μg KOH g ( / = 99:1) > 2.34 μg KOH g ( / = 99:1). The current report presents a nontoxic and eco-friendly alternative solvent for methylbenzene, which may open up an avenue for evaluating the TAN of jet fuels.
评估喷气燃料的酸性特性，尤其是总酸值（TAN），对于确保飞行安全具有重要意义。甲苯通常用作滴定溶剂；然而，它有毒且对环境有害。在测定TAN期间，非常需要开发一种替代甲苯的溶剂，以便从喷气燃料中提取酸性化合物。在此，我们开发了一种理想的替代溶剂，即乙醇与水的体积比为99:1的乙醇 - 水溶液混合物，其在电位滴定法和酸碱滴定法中表现出与甲苯溶剂相似的TAN值。由不同滴定溶剂得出的TAN值顺序为2.96μg KOH/g（乙醇/水/异丙醇 = 100:99:1）> 2.68μg KOH/g（乙醇/水/异丙醇 = 100:99:1）≈ 2.6μg KOH/g（乙醇/水 = 99:1）> 2.34μg KOH/g（乙醇/水 = 99:1）。本报告提出了一种无毒且环保的甲苯替代溶剂，这可能为评估喷气燃料的TAN开辟一条途径。
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