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Investigation of mechanisms of hydrogen transfer in coal hydrogenation. Annual progress report, July 1976--June 1977

Technical Report ·
DOI:https://doi.org/10.2172/6573414· OSTI ID:6573414
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Screening experiments were first undertaken to determine the relative ease of fragmenting C--C, C--N, C--O, and C--S bonds in the presence of a hydrogen-donor solvent at coal liquefaction conditions. Condensed aromatics, such as benzofuran, were stable at temperatures up to 475/sup 0/C. Non-condensed aromatics, such as dibenzyl, fractured in the range of 400--475/sup 0/C. Aromatic ethers, sulfides and compounds having carbonyl, alcohol and hydroxylic groups reacted readily at temperatures below 425/sup 0/C. Detailed experimentation using various donors with dibenzyl indicates that the thermal reaction of dibenzyl forming benzyl radicals is controlling. The reaction rate is independent of the donor solvent (tetralin, decalin, mesitylene), but the product distribution is dependent upon the type of solvent. Hydroaromatics rearranged to form methyl indane-type compounds, thereby, resulting in a solvent of reduced hydrogen donor capacity. The study of hydrogen transfer using deuterium-tagged donor was not successful at temperatures above 400/sup 0/C due to scrambling. It is anticipated that this latter experimentation will be successful at lower temperatures.

Research Organization:
Gulf Research and Development Co., Pittsburgh, PA (USA)
OSTI ID:
6573414
Report Number(s):
FE-2305-12
Country of Publication:
United States
Language:
English

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