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Yao T.,China University of Mining and Technology | Yao T.,Air Force Logistics Institute | Zong Z.-M.,China University of Mining and Technology | Wen Z.,China University of Mining and Technology | And 5 more authors.
Energy Sources, Part A: Recovery, Utilization and Environmental Effects | Year: 2014

A high-temperature coal tar collected from Xuzhou Coking Plant, Saint-Gobain Pipelines (Xuzhou) Co., Ltd. was extracted with petroleum ether (PE) under ultrasonic irradiation and in a Soxhlet extractor. The residue was then extracted with methanol in the Soxhlet extractor. All the extracts were analyzed with gas chromatography/mass spectrometry (GC/MS). More than 250 organic compounds were detected in the PE-soluble fraction, but no GC/MS-detectable species (GC/MS-DSs) in the methanol-soluble but PE-insoluble fraction, indicating that all the GC/MS-DSs were extracted as PE. The GC/MS-DSs include various nitrogen-containing ones, many of which were seldomly reported. Nitrogen-containing organic compounds (NCOCs) detected are aniline, indole, quinoline, isoquinoline, methylquinolines, naphthonitriles, 8-(dimethyl-amino)-1-naphthonitrile, 3-methylindazole, acridine, benzoquinoline, benzoacridine, benzoisoquinolines, carbazole, methylcarbazole, phenanthridine, (Z)-N-(1-phenylethylidene)methanamine, benzocarbazoles, acenaphthopyridine and 2-methylcarbazole. Understanding molecular composition of the NCOCs in coal tar is important for developing an effective coal tar separation process. © Taylor & Francis.

Yang H.,China University of Mining and Technology | Yang H.,Air Force Logistics Institute | Wei X.,China University of Mining and Technology | Fei Y.,Air Force Logistics Institute | And 2 more authors.
Transactions of Nanjing University of Aeronautics and Astronautics | Year: 2013

The surface performances of directly fluorinated high density polyethylene (HDPE) are studied with Fourier transform infrared (FT-IR) spectra, scanning electron microscopy (SEM) and contact angle (CA) system. The SEM images show that there is a three-layer structure called the reaction, virgin and boundary layer structure. The depth of fluorinated layer is 5.75 μm with 1 h fluorination time and 7.86 μm with 2 h. The depths are 5.46 μm and 5.07 μm when fluorine density is 2% and 1%, respectively. CA indicates that the HDPE surface property becomes more hydrophobic with the increasing water contact angle from 78.5° to 104.5°. Oleophobic and hydrophobic features of HDPE are identified by comparison of mass change experiments. It is shown that the increment rate of fluorinated HDPE is much lower than that of un-fluorinated HDPE filled in neither distilled water nor jet fuel.

Fei Y.,Air Force Logistics Institute | Peng X.,Air Force Logistics Institute | Yao T.,Air Force Logistics Institute | Guo F.,Air Force Logistics Institute | Yang H.,Air Force Logistics Institute
Shiyou Huagong/Petrochemical Technology | Year: 2014

The oxidation cracking of ester aviation lubricant base at high temperature was simulated with diisooctyl adipate (DIOA) as the simulating compound and the change of the sample acid value at different temperatures was investigated. The change of the sample composition with temperature rise was studied by means of GC-MS. The results showed that some small-molecule esters were produced at 100℃ and their contents increased with the heat temperature gradually increased. Some smallmolecule ketones and acids were detected in the sample at 170℃ and the color turned to pale yellow. At 300℃, the relative contents of ketones and acids increased to 0.605% and 0.020% respectively, which led to the acid value of the sample reaching 12.597 mg/g (the mass of KOH required to neutralize one gram of sample), the color of the sample became dark yellow obviously and resins were found in the products. The investigation was beneficial to monitoring the thermal-oxidation stability of the ester aviation lubricant base and determining the reasonable serviceable life of lube oil. ©, 2014, Beijing Research Institute of Chemical Industry. All right reserved.

Bian S.,Air Force Logistics Institute | Fei Y.,Air Force Logistics Institute | Yao T.,Air Force Logistics Institute | Jiang H.,Air Force Logistics Institute | And 2 more authors.
Shiyou Huagong/Petrochemical Technology | Year: 2016

The operating environment of aviation lubricating base oils, namely poly(α-olefin) (PAO) and diisooctyl sebacate(DIOS), was simulated by means of a thermal oxidation simulator. Their kinematic viscosity variation and thermal oxidation stability were investigated, and their structure change at high temperature was analyzed by means of GC/MS. The results showed that, when temperature rose from 180℃ to 300℃, the kinematic viscosity of PAO decreased by 9.688 mm2/s with the extent of 53.9%, but that of DIOS decreased only by 1.415 mm2/s with the extent of 12.8%; the initial oxidation temperature(IOT) of PAO decreased by 11.87℃ and that of DIOS decreased by 6.24℃. As the activation energy of PAO is low due to its tertiary carbon atoms, its molecular structure is easily broken down and then small molecule compounds are generated, which leads to the reduction of its viscosity. The double ester structure of DIOS makes its thermal decomposition more difficult and its high-temperature products mainly consist of olefins, unsaturated and saturated esters with low relative contents. © 2016, SINOPEC Beijing Research Institute of Chemical Industry. All right reserved.

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