Research on the Influence of Cosolvent on the Determination of the Contamination Degree of Jet Fuel

Abstract

The effect of cosolvent on trace free water in the determination of the contamination degree of jet fuel was investigated. The interference of trace free water on the automatic particle counter can be eliminated by adding isopropanol as a cosolvent to the measured oil sample. Isopropanol can dissolve trace free water in oil. Addition of isopropanol could stabilize the pollution grade of particles with size ≥30 μm (c) at the same level, which is most obviously affected by free water without isopropanol. The standard uncertainty u(X 1 ) is slightly reduced with the addition of isopropanol, and the repeatability and accuracy of the automatic particle counting method are obviously improved. The results show that isopropanol should be added as a cosolvent to eliminate the interference of free water when the contamination degree of jet fuel oil samples with obvious free water is determined by the automatic particle counting method.

Influence of Foam Characteristics on the Aviation Coolants’ Pollution Degree

“…It is widely known that bubbles are stable in lubricating oil due to the presence of additives at the gas–liquid interface, which can reduce the surface tension effectively. , As for No. 65 AC, there are small amounts of corrosion inhibitor, preservative, defoamer, and other additives apart from the GA solution to ensure other properties of the AC.…”

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

“…Jet fuel, refined from petroleum, consists primarily of hydrocarbons in different structural families and their derivatives formed by hydrocarbons with heteroatoms such as oxygen, nitrogen, sulfur, and metals (iron, sodium, etc. ). − Generally, hydrocarbons are non-polar and do not react with metals at operating temperatures. However, some heteroatom-containing compounds are acidic and corrosive, such as naphthenic acids, thiols, and so on, which were generated during the refining progress, easily leading to the corrosion and swelling of the equipment and materials to which they are exposed. , The possible chemical reactions are listed in equations as 2RCOOH + Fe → Fe­(RCOO) 2 + H 2 and 2RSH + Fe → Fe­(RS) 2 + H 2 .…”

“…). − Generally, hydrocarbons are non-polar and do not react with metals at operating temperatures. However, some heteroatom-containing compounds are acidic and corrosive, such as naphthenic acids, thiols, and so on, which were generated during the refining progress, easily leading to the corrosion and swelling of the equipment and materials to which they are exposed. , The possible chemical reactions are listed in equations as 2RCOOH + Fe → Fe­(RCOO) 2 + H 2 and 2RSH + Fe → Fe­(RS) 2 + H 2 . Such a corrosion and swelling effect not only affects the service life of the storage and transport equipment but also has an impact on the cleanliness and oxidation stability of jet fuels themselves.…”