Исследование структурно-группового состава продуктов пиролиза и термохимолиза сернистых углей методом DRIFT спектроскопии
Електронний архів E-archive DonNTU – (Electronic archive Donetsk National Technical University)
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| Title |
Исследование структурно-группового состава продуктов пиролиза и термохимолиза сернистых углей методом DRIFT спектроскопии
Investigation of structural-group composition of pyrolysis and thermochemolysis products of sulfur coals by DRIFT- spectroscopy method |
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| Creator |
Бутузова, Л.Ф.
Сафин, В.А. Маринов, С. Бутузов, Г.Н. Раздобудько, Т.А. |
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| Subject |
термохимолиз
DRIFT – спектроскопия жидкие продукты термолиза углей thermochemolysis DRIFT – spectroscopy liquid products |
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| Description |
Establishing the relationship between the structure of natural coals and their solubility in a particular solvent is necessary for the successful development of new technologies of the organic mass conversion of coal into liquid products. One of the promising new methods for producing liquid products from solid fuels is thermochemolysis. Thermochemolysis is an improved form of analytical pyrolysis including heating the sample in the presence of tetramethylammonium hydroxide. Effectiveness of the thermochemolysis process based on the methylation reactions of oxygen-containing groups in combination with a thermal degradation in the temperature range 400-500°C, which leads to the destruction of intermolecular interactions in WMD. Previously, the authors tested this method for the first time for studying thermochemolysis of hard coals [2]. The aim of this work - a comparative study of structural-group composition of the products of the standard semicoking, thermal filtration in the centrifugal field and thermochemolysis soluble products for Donetsk coals of different genetic types by reductivity, and identifying the relationship between the yield of liquid thermochemolysis products and structure of the original coals. In this paper, a comparative study of solids obtained during standard Semicoking, thermal filtration in the centrifugal field and soluble products of thermochemolysis for Donetsk coal of different genetic types by reductivity have been investigated by IR spectroscopy with Fourier Transform and techniques of diffuse reflection (DRIFT). Separation of the thermochemolysis products was performed by column chromatography. The first four fractions were studied by gas chromatography-mass spectrometry [2]. It was shown that thermal decomposition of the raw coals in terms of thermal filtration and semicoking leads to a significant reduction in the relative concentrations of aliphatic (2920/1580 cm -1) and oxygen-containing (1640/1580 cm-1) groups and increase the proportion of bridging (1250/1580 cm-1) and aromatic fragments (3050/2920 cm-1) in the solids. Maximum C -O / C = C relation is in nicely with a maximum strength of intermolecular interactions (1740/2920 cm-1) at thermal filtration. It was given arguments that the reactivity of coal, which is manifested in the thermochemolysis conditions, associated with the presence of carbonyl groups involved in polyconjugated system. The presence of a close correlation between the yield of soluble thermochemolysis products and ratio C = O / C = C bonds in the polar fraction of liquid thermochemolysis products. The magnitude of the correlation coefficient is 95%. В работе проведено сравнительное исследование твердых продуктов стандартного полукоксования, термофильтрации в центробежном поле и полярной фракции жидких продуктов термохимолиза донецких углей разных генетических типов по восстановленности (ГТВ) методом ИК-спектроскопии с Фурье преобразованием и техникой диффузного отражения (DRIFT). Приведены доводы в пользу того, что реакционная способность углей, проявляющаяся в условиях термохимолиза, связана с наличием карбонильных групп, включенных в систему полисопряжения. Установлено наличие тесной корреляционной связи между выходом растворимых продуктов термохимолиза и отношением С=О /С=С связей в полярной фракции жидких продуктов термохимолиза. Величина коэффициента корреляции составляет 95%. |
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| Date |
2014-04-15T17:14:34Z
2014-04-15T17:14:34Z 2014 |
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| Type |
Article
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| Identifier |
УДК 552.574
http://ea.donntu.edu.ua/handle/123456789/26012 |
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| Language |
other
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| Publisher |
Наукові праці ДонНТУ. Серія: Хімія і хімічна технологія. - 2014. - Вип. 2(23). - С. 149-156
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