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The influence of nitrogen- and oxygen-containing heterocyclic compounds on the hydrogenation of aromatics and partially saturated aromatics, appropriate to the middle distillates from the hydrocracked product from direct coal liquefaction processes, was investigated. Emphasis was placed on the competitive interaction of hydrosaturation reactions and HDN on nitrogen content. Using mixtures of model compounds, hydrogenation activity was found to be strongly depressed with increasing concentration of N-compounds in the range 0 - 0.14 wt% nitrogen. Hydrogen activity was also decreased, but to a lesser extent, by increasing concentration of O-compound in the range 0 - 0.45 wt% oxygen. A flowing solvent reactor with a continuous solvent sweep through a fixed bed of coal was developed. Solvent flow rates could be varied between 0.4 and 2 ml/s. Solubilised liquid products were continuously swept out of the reaction zone, and the probability of retrogressive reactions was thus minimised. The apparatus was tested by performing liquefaction experiments using a selection of coals.

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Authors: CHADWICK D, Imperial College of Science, Technology and Medicine, London (GB);KANDIYOTI R, Imperial College of Science, Technology and Medicine, London (GB);ALI S ET AL., Imperial College of Science, Technology and Medicine, London (GB)
Bibliographic Reference: EUR 13465 EN (1991) 243 pp., MF, ECU 12
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