Xing Jinjuan

Analysis and Research on the Cause of Tanker Contaminating Jet Fuel

Abstract Through a lot of research on the issue that qualified jet fuel became unqualified jet fuel after tanker transportation and a period of storage. By X-ray photoelectron spectroscopy surface analysis of corroded silver strip and silver strip corrosion test, doctor test, determination of mercaptan sulfur, analysis of sulfur and nitrogen content, test of pickling and alkaline wash and laundering, the mercury wash test and silver nitrate experiments of polluted jet fuel, indicated that silver corrosion resulted from sulfide corrosion, H2S, SO2, SO3, sulfuric acid, acid esters, and other corrosive sulfides were not contained in polluted jet fuel, the corrosive substance in jet fuel was sulfur. The tank inner surface of polluted jet fuel was determined according to GB/T14265-93, the sulfur content in the rust of the tanker inner surface was 1.05% by carbon and sulfur analyzer. Adding the rust into qualified jet fuel, the external situation of tanker transportation was simulated, silver strip corrosion level exceeded 3, which demonstrated that elemental sulfur in the rust dissolved in jet fuel slowly to result in unqualified silver strip corrosion.

Synthesis of 3,6-bisubstituted phenyl-bi-1,2,4-triazolo 3,4-b 1,3,4-thiadiazole derivatives

Abstract2,5-Bihydrazino-1,3,4-thiadiazole (2) was synthesized by condensation of 2,5-bimercapto-1,3,4-thiadiazole (1) with hydrazine hydrate, and compound 2 reacted with acyl chloride to give 2,5-biacylhydrazino-1,3,4-thiadiazole derivatives (3a–3e). Ring closure of compounds 3a–3e was achieved with POCl3 as the cyclization agent giving 3,6-bisubstituted phenyl-bi-1,2,4-triazolo[3,4-b]-1,3,4-thiadiazole derivatives (4a–4e), respectively. The novel compounds were identified by elemental analysis, and by infrared (IR), 1H-nuclear magnetic resonance (NMR), and mass (MS) spectrometry. The mechanism of the cyclization is also discussed.