Analysis of oxygen-functional groups in brown coals

Distribution of oxygen-functional groups (alcohol, phenol, carboxyl, carbonyl, and ether groups) in four brown coals, Australian Yallourn (abbreviated as YL), Indonesian South Banko (SB) and Adaro (AD), and US Beulah Zap (BZ), was evaluated based on chemical analysis and 13C NMR measurement. Concent...

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Bibliographic Details
Published inFuel processing technology Vol. 67; no. 3; pp. 231 - 243
Main Authors Murata, Satoru, Hosokawa, Masahiro, Kidena, Koh, Nomura, Masakatsu
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 01.09.2000
Elsevier Science
Subjects
Applied sciences
Brown coal
Description
Energy
Ether bond cleavage
Exact sciences and technology
Fuels
Oxygen-functionality
Solubility
Wood. Peat. Brown coal
Oxygen-functionality
Ether bond cleavage
Brown coal
Solubility
Concentration measurement
Oxygen
Chemical analysis
Lignite
Ether
Alcohol
Carboxyl group
Nuclear magnetic resonance
Carbonyl
Functional group
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Summary:Distribution of oxygen-functional groups (alcohol, phenol, carboxyl, carbonyl, and ether groups) in four brown coals, Australian Yallourn (abbreviated as YL), Indonesian South Banko (SB) and Adaro (AD), and US Beulah Zap (BZ), was evaluated based on chemical analysis and 13C NMR measurement. Concentrations of carbonyl and ether groups were about 20%, based on total oxygen in coal, while the distribution of carboxyl, alcohol, and phenol changed from coal to coal. The evaluation of the amount of reactive ether groups was conducted by treating the sample coals with SiCl 4–NaI, which is able to cleave alkylaryl- and dialkylethers. The results indicate that the sample coals contained reactive ether groups ranging from 0.3 to 1.8 groups per 100 carbon in coal. The relationships between the amounts of oxygen-functional groups and the solubility of coal were also investigated.
ISSN:0378-3820
1873-7188
DOI:10.1016/S0378-3820(00)00102-8