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Title: Ozonation of coal vitrinites of different metamorphism degrees in gas and liquid phases

Abstract

The comparative analysis of the dynamics of accumulation of oxygen-containing groups in coals of different metamorphism degrees under their ozonation in the gas phase and in chloroform has been performed. The coals of the middle stage of metamorphism demonstrate the highest reactivity. The ozonation in chloroform proceeds with a higher intensity.

Authors:
;  [1]
  1. Russian Academy of Sciences, Kemerovo (Russian Federation). Institute of Coal and Coal Chemistry, Siberian Division
Publication Date:
OSTI Identifier:
21037050
Resource Type:
Journal Article
Resource Relation:
Journal Name: Solid Fuel Chemistry (English Translation); Journal Volume: 41; Journal Issue: 1
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; METAMORPHISM; OZONIZATION; COAL; VITRINITE; OXYGEN; CHLOROFORM

Citation Formats

S.A. Semenova, and Y.F. Patrakov. Ozonation of coal vitrinites of different metamorphism degrees in gas and liquid phases. United States: N. p., 2007. Web. doi:10.3103/S0361521907010041.
S.A. Semenova, & Y.F. Patrakov. Ozonation of coal vitrinites of different metamorphism degrees in gas and liquid phases. United States. doi:10.3103/S0361521907010041.
S.A. Semenova, and Y.F. Patrakov. Thu . "Ozonation of coal vitrinites of different metamorphism degrees in gas and liquid phases". United States. doi:10.3103/S0361521907010041.
@article{osti_21037050,
title = {Ozonation of coal vitrinites of different metamorphism degrees in gas and liquid phases},
author = {S.A. Semenova and Y.F. Patrakov},
abstractNote = {The comparative analysis of the dynamics of accumulation of oxygen-containing groups in coals of different metamorphism degrees under their ozonation in the gas phase and in chloroform has been performed. The coals of the middle stage of metamorphism demonstrate the highest reactivity. The ozonation in chloroform proceeds with a higher intensity.},
doi = {10.3103/S0361521907010041},
journal = {Solid Fuel Chemistry (English Translation)},
number = 1,
volume = 41,
place = {United States},
year = {Thu Feb 15 00:00:00 EST 2007},
month = {Thu Feb 15 00:00:00 EST 2007}
}
  • The fractionated products of ozonation of vitrinites of Kuznetsk coals of different metamorphic stages in chloroform have been characterized by IR spectroscopy, thermogravimetry, and gas chromatography-mass spectrometry. High-molecular-mass compounds insoluble in water prevail in the products. Water-soluble products are ketones, oxyalkanols, lower aliphatic acids, and hydroxy- and dicarboxylic aromatic acids.
  • Problems of unsteady convective heat and mass exchange between drops and a liquid flow are analyzed under a boundary condition of the {open_quotes}thermal capacitance{close_quotes} type. This condition is substantiated by the method of small perturbations. 18 refs., 1 fig.
  • Stepwise ozonation of leaning fusainized components of fossil coal of SS grade in acetic acid was studied. The dynamics of accumulation of oxygen-containing groups in the course of ozonation was examined, and the main pathways of the reaction of ozone with structural fragments of the coal substance were revealed.
  • A comparison of the absorption band intensities for vitrinites of identical coalification showed the chief difference to be in the number of valency variations in the aliphatic groups CH and CH/sub 2/ (2930 and 2860 cm-/sup 1/ bands), and similar valency variations in the carbonyl groups (band close to 1700 cm-/sup 1/. Increased absorption was found in the case of vitrinites of Mesozoic and Cainozoic coals due to the aliphatic groups CH and CH/sub 2/ as compared with vitrinites of Palaeozoic coals. Features established earlier for Palaeozoic vitrinite were confirmed for those of Meso-cainozoic coals. (13 refs.)
  • This approach provides more accurate information on the absorption of oxygen-containing groups than is normally available from IR methods. With increasing rank, the coals tend to contain decreasing carboxylic and ether groups, accompanied by diminishing role of the hydrogen bonds. Internal reflection spectroscopy enables the nature of internal and surface groups within the coal to be differentiated more closely. The presence of bands at 1600 - 1660 cm/sup -1/, coupled with an increase in background absorption with increasing rank, suggest that coal structure is characterised by systems of conjugate non-aromatic bonds. (11 refs.)