Abstract: A consistent high quality coke is produced by feeding a balancing stream comprising hydrocarbons to a delayed coking drum in addition to the heavy hydrocarbonaceous coker feedstock. The process of this invention reduces the contaminant content of coke by coking contaminant-containing residua and a reduced contaminant hydrocarbon balancing stream. Preferably, the balancing stream is a contaminant diluent, such as unreduced crude. The balancing stream may be a crude which is different from the base crude processed in the refinery crude tower and is preferably selected as a sulfur and/or metals diluent having a lower concentration of sulfur-containing or metal-containing compounds than the heavy coker feedstock.

Abstract: A process and apparatus for dewatering a recovered oil stream prior to the recovered oil stream being fed to a fractionator for reprocessing into product s rea s uses a blowdown drum controlled like a drstillatron tower so that the bottoms temperature of the blowdown drum is maintained at a temperature above the dewpoint temperature of the water in the blowdown drum by a reboiler. For refineries that contain a delayed coker unit and a coker fractionator which is used for fractionating light products from residual oil serving as coker feedstock, which coker fractionator is also used to fractionate recovered oil containing water and hydrocarbons, a coker blowdown drum is controlled to maintain an appropriate bottoms temperature to achieve separation in the blowdown drum of water from the hydrocarbons in the recovered oil stream, and the blowdown drum is thus used for dewatering the recovered oil before it is fed to the coker fractionator.