The intrinsic relationship between color variation and performances of the deteriorated aviation lubrication oil

Ma, Jun; Ruan, Shengping; Hu, Jianqiang; Sun, Yuanbao; Fei, Yiwei; Jiang, Xufeng; Dong, Shibao; Chen, Teng; Wu, Nan

doi:10.1016/j.jiec.2020.08.023

Cited by 8 publications

(2 citation statements)

References 23 publications

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“…Considering the similar molecular structure of cyclohexane with naphthenic acids, cyclohexane may be a good alternative for toluene in the titration solvent. − As shown in Figure b, with the mixed solution of cyclohexane, isopropanol, and water ( V cyclohexane / V isopropanol / V water ) as the titration solvent, the TAN values of five times titration are 3.1, 2.9, 2.7, 3.2, and 2.9 μg KOH g –1 , which are slightly higher than that of methylbenzene, isopropanol, and water as the titration solvent. This is mainly because the main organic acid compounds in petroleum products are naphthenic acid compounds; the TAN value should be higher with the solution of cyclohexane, isopropanol, and water as the titration solvent according to the compatibility principle of the dissolution in the similar structure.…”

Section: Results and Discussionmentioning

confidence: 99%

Study on the Alternative Solvent of Methylbenzene in the Total Acid Number Titration of Current Jet Fuels

Chen

Jiang²,

Yan

et al. 2022

ACS Omega

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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–1 (V cyclohexane/V isopropanol/V water = 100:99:1) > 2.68 μg KOH g–1 (V methylbenzene/V isopropanol/V water = 100:99:1) ≈ 2.6 μg KOH g–1 (V absolute ethanol/V water = 99:1) > 2.34 μg KOH g–1 (V isopropanol/V water = 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.

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Section: Results and Discussionmentioning

confidence: 99%

Study on the Alternative Solvent of Methylbenzene in the Total Acid Number Titration of Current Jet Fuels

Chen

Jiang²,

Yan

et al. 2022

ACS Omega

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“…This is mainly because the antifoaming agent can replace the surfactant molecule and undermine the stabilized membrane formed by surfactant molecules at the gas–liquid interface, the mechanical balance of the stabilized membrane is destroyed accordingly and the bubble is broken (Figure ). − Meanwhile, after a period of quiescence, the number of foam also decreases visibly. Also, such a decrement continued with the extension of static time.…”

Section: Resultsmentioning

confidence: 99%

Influence of Foam Characteristics on the Aviation Coolants’ Pollution Degree

Mao¹,

Chen

Xu³

et al. 2020

ACS Omega

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The particulate contamination degree of aviation coolants (ACs) is overestimated commonly because the bubbles in ACs are erroneously recognized as particulate contaminants during the measurement process. In this work, the factors that influence the foam behavior and contamination degree of ACs are investigated. It is evidenced that the foam behavior of ACs is basically unaffected by the ratio of glycol to water of the base solution, which, however, is highly influenced by the organic additive. Also, the more the organic additive arranged at the gas–liquid interface, the lower the surface tension of glycol aqueous (GA) solution and the higher the contamination degree. Furthermore, the foam characteristics and contamination degree of ACs are highly affected by the working conditions, such as airflow, operating temperature, and gas pressure. Besides, the defoaming rate can be accelerated by adding an antifoaming agent or ultrasonic processing; however, the defoaming effect of the natural static method and pressuring positively treatment is disappointing. To further improve the defoaming effect, several efficient synergetic methods of defoaming have been proposed.

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RGB to $$L^{ * } a^{ * } b^{ * }$$ Color Prediction Model Based on Color Cards

Zhang,

Zou,

et al. 2023

Communications in Computer and Information Science

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The intrinsic relationship between color variation and performances of the deteriorated aviation lubrication oil

Cited by 8 publications

References 23 publications

Study on the Alternative Solvent of Methylbenzene in the Total Acid Number Titration of Current Jet Fuels

Study on the Alternative Solvent of Methylbenzene in the Total Acid Number Titration of Current Jet Fuels

Influence of Foam Characteristics on the Aviation Coolants’ Pollution Degree

RGB to $$L^{ * } a^{ * } b^{ * }$$ Color Prediction Model Based on Color Cards

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