Vacuum residue and slurry oil
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What are the differences between vacuum residue and slurry oil?
1. Residue refers to the component obtained at the bottom of a distillation column after crude oil is subjected to atmospheric and vacuum distillation without any reaction; it is a result of physical separation. After products such as straight-run gasoline, diesel, and kerosene are separated out, what remains is the residue. It can be used as a raw material for solvent deasphalting, visbreaking, delayed coking, and the oxidation of asphalt. It can also be used to produce various types of fuel oils for boilers by blending it with different oils, or it can be processed into petroleum asphalt for various applications.
2. The wax oil or residue then goes to a catalytic cracking (FCC) unit for reaction; the hydrocarbons resulting from this cracking are further separated in a fractionation tower, yielding products such as catalytic gasoline, diesel, and heavy diesel. The component obtained at the bottom of the tower is the catalytic cracking slurry. The catalytic slurry contains some catalyst, and the clarified oil after filtration can be used as a component in fuel oil blending.
3. The characteristics of the oil slurry are that it contains over 50% condensed aromatic hydrocarbons, mainly those with four or more rings; these hydrocarbons have few short side chains, resulting in a low carbon-to-hydrogen ratio. Unfiltered oil slurry can be blended into coking processes, but the proportion is generally kept below 5%; if it exceeds this level, it will affect the quality of the coke produced, leading to the formation of pellet-shaped coke and thereby reducing product quality and impacting economic efficiency. It can also cause the coke tower to shake, posing a certain threat to safe production.
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