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- W278474313 abstract "The objective of this research program is to determine the nature of the singly-bonded connecting links between the condensed aromatic and hydroaromatic ring systems in Illinois No. 6 coal. A previous study showed that Illinois No. 6 coal can be largely converted to soluble material by cleavages at ether and ester bonds, without loss of carbon, at or below 50/sup 0/C. For further breakdown of connecting links in both dissolved and undissolved fractions, several oxidation methods are effective at 30 to 50/sup 0/C. Aqueous NaOCl gives the fastest and most complete reaction and some of the lowest losses as CO/sub 2/. 34% nitric acid is most selective in attacking aliphatic material (connecting links); the yield of black acids can probably be improved by use of more and shorter oxidation steps between separations of oxidation products. The highest selectivity in the removal of aromatic material was in NaOCl oxidation 3 at pH 10, but with high loss of carbon. Oxidation with potassium butoxide (K-O-t-Bu) in dimethyl sulfoxide also appears to remove aromatic material preferentially but the change in H/C ratio is limited by low formation of CO/sub 2/. Selective oxidation at low temperatures appears to have great potential for making coalmore » soluble at low temperatures for further investigation, with only 10 to 20% loss of carbon, either by preferential destruction of connecting links or of key rings in condensed systems (perhaps leaving most of the aliphatic connecting links intact). A combination of F/sub 3/C-CO/sub 2/H, H/sub 2/O/sub 2/, and H/sub 2/SO/sub 4/ is notable for removing aromatic material from coal but its potential in making coal soluble with minimum loss of carbon is unknown to the investigators.« less" @default.
- W278474313 created "2016-06-24" @default.
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- W278474313 date "1981-03-29" @default.
- W278474313 modified "2023-09-26" @default.
- W278474313 title "Oxidations of Illinois No. 6 coal at and below 60/sup 0/C. [Oxidizing agents are sodium hypochlorite, nitric acid and potassium butoxide]" @default.
- W278474313 hasPublicationYear "1981" @default.
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