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Title: Liquid-phase ozonation of vitrinites of coals of various metamorphic stages: Product composition

Abstract

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.

Authors:
; ; ;  [1]
  1. Russian Academy of Sciences, Kemerovo (Russian Federation). Institute of Coal and Coal Chemistry, Siberian Division
Publication Date:
OSTI Identifier:
21037057
Resource Type:
Journal Article
Resource Relation:
Journal Name: Solid Fuel Chemistry (English Translation); Journal Volume: 41; Journal Issue: 2
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; VITRINITE; COAL; CHLOROFORM; MORPHOLOGY; RUSSIAN FEDERATION; CHEMICAL COMPOSITION; SOLUBILITY; OZONIZATION

Citation Formats

S.A. Semenova, Y.F. Patrakov, O.N. Fedyaeva, and L.M. Pokrovskii. Liquid-phase ozonation of vitrinites of coals of various metamorphic stages: Product composition. United States: N. p., 2007. Web. doi:10.3103/S036152190702005X.
S.A. Semenova, Y.F. Patrakov, O.N. Fedyaeva, & L.M. Pokrovskii. Liquid-phase ozonation of vitrinites of coals of various metamorphic stages: Product composition. United States. doi:10.3103/S036152190702005X.
S.A. Semenova, Y.F. Patrakov, O.N. Fedyaeva, and L.M. Pokrovskii. Sun . "Liquid-phase ozonation of vitrinites of coals of various metamorphic stages: Product composition". United States. doi:10.3103/S036152190702005X.
@article{osti_21037057,
title = {Liquid-phase ozonation of vitrinites of coals of various metamorphic stages: Product composition},
author = {S.A. Semenova and Y.F. Patrakov and O.N. Fedyaeva and L.M. Pokrovskii},
abstractNote = {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.},
doi = {10.3103/S036152190702005X},
journal = {Solid Fuel Chemistry (English Translation)},
number = 2,
volume = 41,
place = {United States},
year = {Sun Apr 15 00:00:00 EDT 2007},
month = {Sun Apr 15 00:00:00 EDT 2007}
}
  • 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.
  • On the basis of an investigation of 46 samples of brown coals of the Eastern regions of the country, an interrelationship has been established between the reflectances measured in air and in immersion. The indices of the refraction and absorption of light have been calculated. A rise in the light absorption index with a decrease in the stage of metamorphism of the coals has been found. The relation obtained permits the refractive index of the vitrinite to be determined from its reflectance in immersion.
  • A mathematical analysis is given of the influence of individual factors on the size of the scatter of the values of the reflectances in polished briquettes. The degree of polarization of the light has been determined in a MIM-7 microscope, Q.0.39/plus or minus/0.02. It has been established that the dispersion of the bulk reflectance changes according to a curve with a minimum in the region of medium stages of metamorphism. It has been shown that the difference in the reflectances of different types of vitrinites - telinites and collinites - is independent of reduction of the coals. 17 refs.
  • In the reported experiment, the vitrinites of the coalification stages from B to A have been studied by IR spectrometry. A comparison of the intensities of the absorption bands of equally coalified vitrinites of different ages has shown that they differ mainly in their content of stretching vibrations of aliphatic CH and CH/sub 2/ groups (absorption bands at 2930 and 2860 cm/sup -1/) and the stretching vibrations of C.0 groups (band close to 1700 cm/sup -1/). A high absorption in the vitrinites of Mesozoic and Cenozoic coals due to aliphatic CH and CH/sub 2/ groups as compared with the vitrinitiesmore » of Paleozoic coals has been found. The laws established previously in the coalification series for the vitrinites of Paleozoic coals have also been confirmed for the vitrinites of Meso-Cenozoic coals. 13 refs.« less
  • 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.)