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- W335844478 abstract "The interaction of a Western subbituminous coal with solvents of four representative types, vis., hexane, benzene, tetralin, and phenol, has been studied at the equilibrium pressure of each solvent in the temperature range of from 150 to 350/sup 0/C. Extractions by reflux liquid were conducted at times varying from 4 to 200 hr. The amount extracted in 4 hr ranged from less than 2 wt.-percent with hexane at 150/sup 0/C up to 57.4 wt.-percent with phenol at 300/sup 0/C. Number average molecular weights for the benzene-soluble fractions of the extracts were determined by vapor pressure osmometry using benzene as the medium. The benzene solubles, or asphaltenes, from benzene and tetralin extractions at 200/sup 0/C for 4 hr had an average molecular weight of near 800, while the phenol extract asphaltenes from a 200/sup 0/C, 4 hr extraction had an average molecular weight of roughly 600. The extracts were found to be hydrogen-rich compared to the raw coal; the extent of enrichment varied inversely with yield, i.e., with amount extracted. Consistent with these higher hydrogen contents, the shallow extracts using tetralin as a solvent showed very low aromaticity in proton NMR analysis. No hydrogen transfer from tetralin to the coal was evidenced (by naphthalene in the solvent) for contacting temperatures up to 300/sup 0/C, but transfer of 0.5 to 0.7 percent hydrogen per unit weight of dry ash-free coal occurred at 350/sup 0/C. The low aromaticityof extracts, along with the generally higher yields and strong increases in yield with increasing temperatures, suggest possible differences in the coal/solvent interaction behavior with subbituminous coal compared to higher rank coals. (auth)" @default.
- W335844478 created "2016-06-24" @default.
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- W335844478 date "1975-09-01" @default.
- W335844478 modified "2023-09-27" @default.
- W335844478 title "Action of solvents on subbituminous coal below pyrolysis temperature. [150-350/sup 0/C; hexane, benzene, tetralin, phenol]" @default.
- W335844478 doi "https://doi.org/10.2172/7199009" @default.
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