Reference

Effect of deoxygenation and prestressing on hydrocarbon fuel thermal stability

Effect of deoxygenation and prestressing on hydrocarbon fuel thermal stability. Bittker, David A. (Lewis Res. Cent., Natl. Aeronaut. Space Adm., Cleveland, OH, USA). NASA Tech. Memo., NASA-TM-83456, E-1771,NAS1., 19 pp. Avail. NTIS From: Sci. Tech. Aerosp. Rep. 1983, 21(23), Abstr. No. N83-35160 (English) 1983. CODEN: NATMA4. ISSN: 0499-9320. 7782-44-7 and 124-18-5 which are cas registry numbers of chemicals are mentioned. DOCUMENT TYPE: Report CA Section: 51 (Fossil Fuels, Derivatives, and Related Products) A jet fuel thermal oxidn. tester was used to study the effect of deoxygenation and deoxygenated prestressing on deposit formation when hydrocarbon fuels are thermally stressed. Four pure hydrocarbons, (n-decane [124-18-5], cyclohexane [110-82-7], C6H6 [71-43-2], and 1-hexene [592-41-6]) and 2 mixts. (10 percent Tetralin [119-64-2] in n-dodecane [112-40-3] and com. Jet A) were used at 250-400°. Deoxygenation decreased deposit formation for cyclohexane but increased it for C6H6. Deoxygenation decreased deposit formation for the 2 fuel mixts. at 250° but had no effect at 350°. Deoxygenated prestressing either increased or decreased deposit formation depending on the fuel used and the temp. .

Studies on coal liquefaction mechanism

Studies on coal liquefaction mechanism. Part 2. Mechanism of Taiheiyo coal liquefaction by tritium and carbon-14 tracer method. Kabe, Toshiaki; Nitoh, Osamu; Kim, Shugen (Fac. Eng., Tokyo Univ. Agric. Technol., Koganei 184, Japan). Sekiyu Gakkaishi, 26(6), 424-30 (Japanese) 1983. CODEN: SKGSAE. ISSN: 0582-4664. DOCUMENT TYPE: Journal CA Section: 51 (Fossil Fuels, Derivatives, and Related Products) The liquefaction of Taiheiyo coal by use of 6H and 14C double-labeled solvent A (PhMe [108-88-3]-p-3H and PhMe-Me-14C), and Tetralin [119-64-2]-H and a small amt. of nephthalene [91-20-3]-1-14C or Tetralin-14C) was studied at 400-440°, under initial H pressure 3 or 60 kg/cm2, and with or without Ni-Mo/Al2O3 catalyst. The distribution of liquefied products and the 3H and 14C contents in the products were detd. by a liq. scintillation counter to study the H transfer mechanism and the fate of the solvents. This method was successful in elucidating, simultaneously, the H- and the C- transfer reactions between solvent and coal. The solvent A contributed to coal liquefaction insignificantly because H transfer from the solvent was small. The 2H contents in the reaction products were small and only small amts. of 14C were transferred from the solvent to the products. Coal liquefaction in the solvent was suggested to take place directly with gaseous H. The rate of coal liquefaction by use of H-donor solvent B was greater than that of the reaction using the solvent A. The amt. of 3H transferred to the liquefied products was about twice as much as the amts. of 3H substituted in the liquefied products; thus, 3H was transferred by both hydrogenation and isotope-exchange reactions. Though re-hydrogenation of the solvent B had occurred at 440°, gaseous H was used directly for part of the coal hydrogenation. However, the amts. of 14C transferred to the liquefied products were small, and the total 14C recovery in the solvent was 96. 108-88-3 and 91-20-3 are just another two chemicals used in this study.5% even under the most severe reaction conditions. The C exchange or transfer between solvent B and coal was very small. .