关键词: 催化裂化油浆, 固体颗粒, 油浆预处理, 脱固效率

Abstract:

This paper proposes a method of pre-treating the FCC slurry and then performing electrostatic removal of solid. Adding auxiliaries to reduce the viscosity of the slurry system and assisting in centrifugal separation to remove asphaltenes and reducing the "competitive adsorption" of asphaltenes in FCC slurry on electrostatic tower packing. Studies have shown that about 90% of the solid particles in the FCC slurry A are catalyst particles, and the particle sizes are small, most of which are smaller than 15 \mathrm{\mu } \mathrm{m} , and the rest are coke powder particles, which are difficult to separate. The viscosity of the slurry system can be reduced to 0.85mm²/s (80℃) ,when the ratio of MCA-B, a promoter is 150% (mass ratio) of the slurry. The viscosity of the slurry system can meet the requirements of electrostatic separation. The centrifugation experiment with centrifugal force of 3819g and centrifugal time of 10 min made the resin and asphaltene in the slurry reduced by 6.34% and 58.82%, respectively, and thus the effect of purifying the slurry was achieved. Finally, under the conditions of static voltage 14kV, electrostatic temperature 70℃, electrostatic stabilization time 30min, the separation efficiency of the slurry can reach more than 98%, and the solid content in the slurry can be reduced to less than 30―60μg/g. It can meet the requirement of solid content as raw material to produce high value-added product.

Key words: catalytic cracking slurry, solid particles, slurry pretreatment, separation efficiency