Three highly fluid bituminous coalsfrom the Pittsburgh, Powellton, and Eagle seamswere
reacted with atmospheric resid and decant oil in microautoclave reactors under nitrogen at
temperatures of 450−500 °C. This exploratory study is the first step in evaluating the prospects
for adding coal to delayed cokers to obtain coal-derived components in the liquid product.
Subsequent hydrotreating (not studied here) of the liquid would produce a jet fuel with good
stability toward pyrolytic decomposition. Coal-derived components appear in the oil fraction from
coal−resid reactions at 465 °C. This reaction temperature represents a “coke jump”, in which
the yield of solid, as a function of temperature, increases dramatically. This behavior is not
observed when the individual feedstocks are reacted alone. Further evidence for coal−petroleum
interactions in this system is exhibited by the fact that (i) the product slates from the co-coking
reactions are not linear combinations of the products from the feedstocks reacted individually
and (ii) the fluidity profiles of the Powellton−resid mixtures are similar to those for two interacting
coking coals. The effect of changing coal with the same petroleum feedstock is minimal, although
the coals are very similar in composition and properties. In contrast, changing from resid to
decant oil with the same coal causes major changes in the product slate.
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