Reference

Hydrocarbons of the hopane series in petroleums

Hydrocarbons of the hopane series in petroleums. Pustil'nikova, S. D.; Abryutina, N. N.; Kagramanova, G. R.; Petrov, A. A. (Inst. Geol. Razrab. Goryuch. Iskop., Moscow, USSR). Geokhimiya, (3), 460-8 (Russian) 1976. CODEN: GEOKAQ. DOCUMENT TYPE: Journal CA Section: 51 (Fossil Fuels, Derivatives, and Related Products) Section cross-reference(s): 31 Pentacyclic C27-35 triterpane hydrocarbons found in amts. of 0.1-0.6% in Gyurgyan and Anastas'ev-Troitsky Tertiary and Samotlor Mesozoic petroleums by chromatog. and mass spectroscopy of fractions b. >450.degree. were mostly 17.alpha.(H)-hopane and its homologs, including trinorhopane [53584-59-1], adiantane [53584-60-4], and homohopanes I and II, all probably derived from compds. of biol. 53584-59-1 and 471-67-0 are just another two chemicals used in this study. origin through a change in configuration at C17 and epimerization at C22. Oleanane [471-67-0] was also present. .

Influence of temperature and pressure on maturation processes

Influence of temperature and pressure on maturation processes. I. Preliminary report. Sajgo, C.; McEvoy, J.; Wolff, G. A.In this study， 53584-59-1 and 53584-60-4 are also used.; Horvath, Z. A. (Lab. Geochem. Res., Hung. Acad. Sci., Budapest H-1112, Hung.). Org. Geochem., 10(1-3), 331-7 (English) 1986. CODEN: ORGEDE. ISSN: 0146-6380. DOCUMENT TYPE: Journal CA Section: 51 (Fossil Fuels, Derivatives, and Related Products) Immature alginite and lignite were compressed into disks and heated at 200-450° 0.6-2.5 kbar in open and in quasi-closed systems for 1 wk. The liq. and solid products of thermal alteration were investigated by gas chromatog., mass spectroscopy, and vitrinite reflectance (Ro). The Ro value changed from 0.47% at 200° to 2.74% at 450° at low pressure, and from 0.50% at 200° to 0.91% at 450° in the quasi-closed system loaded at 2.5 kbar. The distribution of n-alkanes changed with pressure at const. temp. The formation of hopenes and sterenes and their conversions to hopanes and steranes were retarded in the higher pressure expts. Isomerization at C-22 in hopanes and at C-20 in steranes was first obsd. at 400 and 450°, resp., and was far from complete in both cases. The aromatization of C-ring monoarom. steroids to ABC ring triarom. was only partial (36-38%) at 450° in the high pressure expts. Maturation at >300° is greatest in the low-pressure system (0.06 kbar internal pressure from volatiles) than in open system with 0.06 kbar load, and much greater than in open or quasi-closed systems with static loads of 190 or 2.5 kbar. .