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

摘要：

提出先对催化裂化（FCC）油浆进行预处理再进行静电脱固的方法，加入助剂降低油浆体系的黏度，并辅助离心分离脱除沥青质，降低FCC油浆中沥青质在静电塔填料上的“竞争吸附”，从而提高静电脱固的效率。研究表明，FCC油浆A中的固体颗粒90%左右是催化剂颗粒，且颗粒粒径较小，大部分集中在15 \mathrm{\mu } \mathrm{m} 以内，其余为焦粉颗粒，较难分离。当加入多功能复合助剂MCA-B，助剂加入比例为油浆的150%（质量比）后，油浆A体系的黏度降低至0.85mm²/s（80℃），可满足静电脱固的黏度要求。再进行离心条件为离心力3819g，离心时间10min的离心实验，使得油浆A中的胶质和沥青质分别降低了6.34%和58.82%。最后在静电电压14kV，静电温度70℃，静电稳定时间30min的条件下进行静电脱固，在此实验条件下油浆A和油浆B的脱固效率都可达到98%以上，能够将油浆中的固含量降低到30~60μg/g，可满足作为生产高附加值产品原料的固含量要求。

关键词: 催化裂化油浆, 固体颗粒, 油浆预处理, 脱固效率