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- W29043734 abstract "The goal of these studies was to elucidate the structural features of coals which are believed to be important in conversion processes. Of special interest are the nature of the hydroaromatic groups and the bridging groups between aromatic moieties, because of their roles in thermal cleavage and depolymerization processes and the hydrogen shuttling which occurs during the depolymerization and stabilization of cleavage products. The first objective was the development of new methods for the isolation or solubilization of the aliphatic groups in the coal, which may then be related to these hydroaromatic systems and bridging groups. We have successfully used ruthenium tetroxide in a two phase solvent system with a phase transfer catalyst to selectively oxidize the aromatic groups. The oxidation of a North Dakota lignite with ruthenium tetroxide with the phase transfer catalyst proceeded rapidly at ambient temperature giving carbon dioxide and carboxylic acid products which were converted to methyl esters by diazomethane for qualitative analysis using GC and GC/MS. A very complex mixture of aliphatic mono and polycarboxylic acids and aromatic polycarboxylic acids was formed in the reaction. A comparison of three oxidation methods, the ruthenium tetroxide with phase transfer catalyst, the ruthenium tetroxide with acetonitrile and themore » trifluoroperacetic acid, was carried out on the same sample of Beulah lignite. There was no significant difference in the amounts of acid products between the two ruthenium tetroxide methods. A number of low-rank coals were oxidized for comparison purposes. Values for the amounts of six carboxylic acid products which were determined using the isotope dilution method are reported in Table 2. The amounts of the six acids in the oxidation products generally increase with coal rank or % C. 8 refs., 6 tabs.« less" @default.
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- W29043734 date "1985-01-01" @default.
- W29043734 modified "2023-09-27" @default.
- W29043734 title "Ruthenium tetroxide oxidation of low-rank coals" @default.
- W29043734 hasPublicationYear "1985" @default.
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