Abstract
In the delayed coking process, the actual feed to the coking drum consists of a high-boiling fraction of the feedstock, fluid catalytic cracking decant oil (FCC-DO), and the high-boiling end of the liquid products produced by delayed coking (recycle). As distinct from the parent decant oil feed, the molecular composition and coking behavior of actual feed samples to the coking drum (CF) are reported for the first time in this paper. This study examines a commercial pretreatment approach where the feedstock to the fractionator column includes a hydrotreated fraction (HYD) and a vacuum tower bottom (VTB) fraction of a decant oil. Samples of two sets of decant oils including the corresponding HYD, VTB, and CF derivatives were analyzed and carbonized in laboratory reactors to monitor mesophase development from these materials. Decant oil samples and their derivatives, HYD, VTB, and CF, have substantially different molecular composition. The CF samples are characterized by lower degrees of methyl substitution ...
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