Abstract: A study on chemical stripping technology was carried out in a small fixed-fluidized bed，using Daqing crude oil mixed with vacuum residue or FCC slurry as feedstock. Relative gas yield，relative coke decrement and coke content were used to evaluate stripping efficiency. Product components and stripping efficiency of chemical stripping technology and vapor stripping technology were experimentally compared. The influence of temperature，ratio of adding regenerant，reaction temperature，catalyst-oil ratio on stripping efficiency and stripping temperature were also investigated. The results showed stripping efficiency increased first，then stayed steady with the increase of catalyst-oil ratio and temperature of adding regenerant. It increased with the increase of catalyst-oil ratio，decreased with the increase of reaction temperature. The stripping temperature growth of heavy feedstock is lower than that of the light one，when increasing the temperature and ratio of adding regenerant. With chemical stripping technology，the stripping efficiency increased by 20%，coke content of regenerated catalyst decreased by not less than 7%.

Key words: catalytic cracking, chemical stripping, regenerated catalyst, vapor stripping, stripping efficiency

摘要： 用自制的小型固定流化床，以掺入减压渣油、油浆的原油为原料进行化学汽提研究。以相对可汽提碳、汽提气体相对产率、再剂含碳量为评价指标，对比分析化学汽提与水蒸气汽提工艺气体产物组成、汽提效率的差别，考察再剂加入比例、加入温度、反应温度、剂油比对化学汽提效率、汽提温度的影响。结果表明，化学汽提效率随再剂加入比例、加入温度的增加先增大后趋于平缓，随反应温度增加而减小，随剂油比增大而增大；提高再剂加入比例、加入温度时，重质原料汽提温度增幅小于轻质原料。采用化学汽提工艺能改变气体产物分布，使汽提效率提高约20%，再剂含碳量降低7%以上。

关键词: 催化裂化, 化学汽提, 再生剂, 水蒸气汽提, 汽提效率