Abstract: The solid particle of catalyst in FCC slurry is the bottleneck that affects its physical and chemical properties and high-value utilization. Therefore, slurry desolidification technology becomes the key breakthrough for further processing. Reagent sedimentation method is the main method of oil slurry desolidification, but the application effect is not ideal for high viscosity oil slurry. For further research, the slurry from a refinery was chosen as sample and named slurry Z. In order to reduce the ash content of the oil slurry, the viscosity of the oil slurry was changed by increasing the temperature, introducing dilution component and adding viscosity modifier. The results showed that the desolidification rate of the oil slurry could be increased to more than 80% by increasing the temperature to 130 ℃ or adding 0.1% viscosity modifier, and the desolidification rate of the oil slurry could be increased to more than 95% by adding dilution components such as diesel fraction or aromatic solvent oil.

Key words: catalytic cracking, oil slurry, desolidification rate, viscosity, viscosity modifier