Abstract: To maximize the supply of slurry from catalytic cracking unit(FCC slurry) for advanced carbon materials, a combined low-temperature flexible and residue filtration deashing technology for FCC slurry was developed and implemented in SINOPEC Maoming Company.This technology employs flexible filter materials operating at 120—160 ℃, combined with back-blowing regeneration and adsorption processes using environmentally friendly composite filter materials, achieving efficient solid removal from both raw FCC slurry and residues. Operational results demonstrate that the low-temperature flexible deashing unit produces deashed FCC slurry with an average ash content below 0.01%, achieving an ash removal rate exceeding 98% and a FCC slurry yield of approximately 94%. The residue filtration deashing unit further reduces ash content to below 0.01% with an average ash removal rate of over 99%, while maintaining a dry residue yield below 1%. The integrated system achieves an overall purified FCC slurry recovery rate exceeding 99%, significantly enhancing resource utilization and reducing environmental burdens from solid waste. This technology provides stable feedstock for high-value carbon materials such as needle coke, characterized by low energy consumption and environmental benefits, demonstrating substantial industrial applicability and promotion value.

Key words: FCC slurry, low-temperature flexible deashing, residue filtration deashing, low energy consumption, dry residue