A delayed coking process for use in a delayed coking unit that includes at least one drum, the coking unit producing a delayed coking unit product stream and a coke product that is retained in the drum, the coking product stream being introduced into a coking product fractionator to produce at least a bottoms fraction, an intermediate fraction and a light fraction, the process comprising: a. introducing into a mixing zone at least one adsorbent material that selectively adsorbs sulfur- containing and/or nitrogen-containing compounds with at least a portion of the intermediate fraction that is withdrawn from the coking product fractionator to produce an adsorbent slurry; b. combining said adsorbent slurry with the coking unit product stream containing undesirable sulfur and/or nitrogen compounds and mixing to form a coking product fractionator feedstream; c. passing the coking product fractionator feedstream to the fractionator to recover light product streams from the fractionator having a reduced amount of sulfur and/or nitrogen compounds; d. introducing a fresh hydrocarbon feedstock that includes undesirable sulfur- and/or nitrogen-containing compounds for preheating into the lower portion of the coking product fractionator; e. passing said adsorbent material containing adsorbed sulfur- and/or nitrogen-containing compounds to the bottom of the fractionator and mixing it with the fractionator bottoms and the fresh hydrocarbon feedstock; f. discharging the bottoms fraction containing the at least one adsorbent material and the fresh hydrocarbon feedstock from the fractionator to form a mixed coking unit feedstream; g. introducing the mixed coking unit feedstream that includes the adsorbent material into a coking unit furnace and heating the mixed coking unit feedstream to a predetermined coking temperature; and h. passing the heated mixed coking unit feedstream from the furnace to the delayed coking drum to produce the delayed coking product stream and depositing the adsorbent material having adsorbed sulfur- and/or nitrogen-containing compounds with the coke on the interior of the delayed coking drum. a. introducing into a mixing zone at least one adsorbent material that selectively adsorbs sulfur- containing and/or nitrogen-containing compounds with at least a portion of the intermediate fraction that is withdrawn from the coking product fractionator to produce an adsorbent slurry; b. combining said adsorbent slurry with the coking unit product stream containing undesirable sulfur and/or nitrogen compounds and mixing to form a coking product fractionator feedstream; c. passing the coking product fractionator feedstream to the fractionator to recover light product streams from the fractionator having a reduced amount of sulfur and/or nitrogen compounds; d. introducing a fresh hydrocarbon feedstock that includes undesirable sulfur- and/or nitrogen-containing compounds for preheating into the lower portion of the coking product fractionator; e. passing said adsorbent material containing adsorbed sulfur- and/or nitrogen-containing compounds to the bottom of the fractionator and mixing it with the fractionator bottoms and the fresh hydrocarbon feedstock; f. discharging the bottoms fraction containing the at least one adsorbent material and the fresh hydrocarbon feedstock from the fractionator to form a mixed coking unit feedstream; g. introducing the mixed coking unit feedstream that includes the adsorbent material into a coking unit furnace and heating the mixed coking unit feedstream to a predetermined coking temperature; and h. passing the heated mixed coking unit feedstream from the furnace to the delayed coking drum to produce the delayed coking product stream and depositing the adsorbent material having adsorbed sulfur- and/or nitrogen-containing compounds with the coke on the interior of the delayed coking drum.