05594 Peat humic and fulvic acid structure analysis by 13C-NMR-spectroscopy method

01 95/05591 Mineralogical compoaltlon of the Aahibetau coala In the lahlkarl coalfield. Ill. Carbonate and phosphate minerals, and boehmite Kimura, T. and Kubonoya, M. Shigen Chishitsu, 1995, 45, (2), 99-109. (In Japanese) Carbonate and hosphate minerals, and boehmite in the seven Paleogene coal seams of tKe Ashibetsu collierv in the Ishikari coalfield. Hokkaido. were investigated by X-ray diffraction analysis of low temperature ash; shale. and tuff. Calcite is the most abundant amona the minerals studied. and i6 contained in 83% of the 75 coal samples coitaining less than 40% ash. Ankerite is also abundant, and was found in 71% of the coal samples. Aragonite is rare, and is thought to appear as a part of cleat and fracture fillings. Carbonate minerals are rare in shale. The Ca, Mg, and Fe content in the low ash and pyrite free coals, rich in calcite and/or ankerite, is estimated to be nearly the ssame as in plants or peats. 95105592 Non-laothermal deaorptlon of carbon dioxide from Polish coala wlth different texture Nodzenski, A. Energy & Environment, 1995, 6, (3), 237-246. The process of gas evolution from coal depends to a great extent on coal texture, and specially on the structure of its pores. A transport of sorbate from within a grain to its external surface, and therefore the evolution of gas desorbed from coal depends on the structure of pores. Results of the mvestigations of nonisothermal desorption of carbon dioxide from several Polish coals are given in the article. A comparison of nonisothermal desorption curves obtained under the same conditions for coals with different pore volumes and pore volume distributions showed that the process of gas evolution depends~on the porous structure of coal. Basing on the analysis of experimental data, a possibility of the differentiation between outburst-prone coals and those which are believed not to lead to outbursts was shown. Numerlcal analyala of EPR spectra of coal, macer95105593 ala and axtractlon aroducta Pilawa, B. et al., Rbdiat. Phys. Chem., 1995, 45, (I), 899-908. The multi-component structures of the ESR spectra of Polish medium-rank coal, coal ma&als, and their pyridine extraction products were analyzed. The best numerical approximation of the EPR spectra for exinite, vitrinite and their extraction residues was obtained when two Lorentz curves and one Gauss curve were chosen for calculation. The ESR spectra of inertinite and its residue were a superposition of two Lorentz lines. Peat humlc and fulvlc acid structure analyala by 95io5594 ‘3C-NMR-apectroacopy method Maryganova, V. V. et al,, Dokl. Akad. Nauk Belarusi, 1994, 38, (4), 52-55. (In Russian) Describes how ‘“CINMR spectroscopy was applied to examine the types of carbon in unsaturated, saturated unsubstituted, saturated oxygen and nitrogen-substituted, and carbonyl structures in peat-derived humic and fulvic acids. Examined the structural pecularities of humic and fulvic acids extracted from the peats of various geobotanical origin. A petrographlcal note on some Tertiary llgnltea 95105595 Miki, T. and Aizawa, J. Ganko, 1995, 90, (2), 64-68. Tertiary lignite samples (total 6) collected in 2 provinces of northern Thailand are examined. Chemical comoositien fvolatile matter. C. H, N, 0 + S. and pyrite contents) of them are given. . Phyalcochemlcal propertlaa of Macaak coal. I. 95105596 Coal-llauld lntaractlons Dekany?‘I. et al., Magy. Kern. Foly., 1995, 101, (2), 64-67. (In Hungarian) Accordmg to petrographic and X-ray diffraction studies, the internal structure of Mecsek (Hungerian) coal is similar to the lamellar structure of clay minerals. Associated with this. it was also demonstrated. from liauid absorption isotherms and molar enthalpy of wetting, that hydrophobic clay minerals are present in the internal structure of coal. Phyalcochamlcal propartlaa of Macsak coal. II. 95105597 Coal-gas lnteractlon Toth, J. and Lakatos, J. Magy. Kern. Foly., 1995, 101, (2) 68-71. (In Hungarian) The sorption isotherms and isobars of different gases (N,, CH,, CO,) were measured in coals, and the equivalent specific surface.areas and theTr temperature dependences were calculated. Results were compared with similar data calculated from MeOH-water and MeOH-benzene excess isotherms. The surface areas calculated from gas sorption isotherms and MeOH-water excess isotherms were comparable. Plaatlc state of coals 9SiO5596 Khim. Tverd. Topl. (Moscow), 1995, (l), 84-89. (In Gordeev, G. P. Russian) Discusses plastic state and properties of caking coals.

Solid fuels (sources, winning, properties)

95105599 Quallt varlatlona In the high-sulfur lignite of the Neogene Beypazarr Baaln, Central Anatolia, Turkey Whateley, M. K. and Tuncali, E. Int. J. Coal Geol., -1995, 27, (2), 131-151. During the Miocene, a number of fault-bounded basins developed in Central Anatolia, Turkey. One such basin at Cayirhan, near Beypazari, contains thick, laterally extensive lignite seams, which filled initially with coarse elastic material. Upward fining of the elastics during basin fill, with an increase in the amount of clay and carbon content, led to the develop ment of relatively shallow limnic basins in which extensive peat deposits accumulated in low-lying mires. These lignites are characterued by their high sulphur and ash contents.

95lO5600 Rapld quality control for coal aeama by neutron activation analysis Sekhar, N. R. et al., IEEE Trans. Nucl. Sci., 1995, 42, (2), 115-116. The quality of coal expressed as useful heat value depends on various parameters, like fixed carbon, volatiles, ash and moisture. The factors are assessed and the dependence of useful heat value on all the parameters were studied in depth for a mine.

Reduction and reductive alkylatlon of coals In an 95lO5501 alkall metal/llquld ammonla system as a method of InvaatlgatIng thalr structure Kozlowski, M. and Wachowska, H. Wiad. Chem., 1994,48, (I), 509-525. (In Polish) Discusses the application of reduction methods and reductive alkylation in alkali metal-liquid ammonia systems as a means for investigating the chemical structure of coal. Also describes the course of the above processes carried out for model compounds.

Skyllna Mines: Vantllatlon planning and dealgn 95105502 Duckworth, I. J. et al., Coal, Aug. 1995, 100, (8), 38, 41-42, 44. Discusses a ventilation systems at Utah Fuel Co’s Skyline Mines, located near Price, Utah.

Solvent axtractlon of Paklatan coals. (Ill) Extractlon 95/05503 and characterlzatlon of THF extracts by apectroacoplc techniques Khan, A. 2. er al., Fuel Sci. ,Technol. Int., 1995, 13, (8), 973-990. Describes how the Makenval coal of Pakistan gives higher extractions with THF than a Sharigh, Sor-Range and Lakhra coals. The structural characterization of Pakistan coal extractions by FTIR spectroscopy indicates that all the extractions contained less condensed aromatic rings in comparison to their original coal.

Structural characterlatlca of anthracltaa, metaan95105604 thracltaa, and graphltea genetlcally related to them Vyalov, V. I. Khim. Tverd..Topl. (Moscow), 1995, (l), 15-24. (In Russian) Reports on an X-ray diffraction study of organic matter and anthracites from zones of regional metamorphism, and meta-anthracites and graphites formed by contact metamorphism.

Structural charactarlatlca of aromatlc fractlon from 95/05605 aupercrltlcal fluld extraction of llgnltaa Wana, X. et al.. Ranliao Huaxue Xuebao, 1994, 22, (4), 418-426. (In Chin&) Aromatic fractions from supercritical fluid extracts of Xianfen lignite and Jinsuo lignite, Yunnan Province, were characterized by chromatography separation combined with GC-MS techniques. Results showed that biphenyl, bibenzyl and their alkyl substituted derivatives were the main components of these aromatic fractions; polynuclear aromatic hydrocarbons, such as phenanthrene, fluorene, pyrene, fluoranthene and benzopyrene, were presented in small amounts.

Structure raprsaantatlon of the apaclflc fractlona 95lO5606 from Plngahuo coal Zhang, Y. F. et al., Fuel Sci. Technol. Int., 1995, 13, (8), 957-972. Discusses the basic data of four pyridine extraction fractions, PM,, PM,, PM, and PM,, from Pingshou bituminous coal obtained by ultimate analyses,mean molecular weight measure, GC/MS, ‘3C NMR. H NMR and FTIR techniques. A methZid calculating the average molecular parameters of the fractions is introduced. Molecular structure models of the fractions of PM,, PM, and PM, are constructed based on the calculated parameters.

Fuel and Energy Abstracts November 1995 403