重油中金属卟啉化合物对催化裂化性能的影响

摘要

从仪长管输油渣油和委内瑞拉380重油中分离出镍、钒卟啉化合物,并按不同比例掺入原料油中,在固定流化床反应器上考察金属卟啉化合物含量对重油催化裂化产物分布和催化剂性能的影响.结果表明:随着原料油中镍、钒卟啉含量的增多,催化裂化产物中汽油和柴油的收率降低,气体和焦炭的产率增加,催化剂对轻质油的选择性变差,镍卟啉化合物对反应选择性的影响更大；镍、钒卟啉可使催化剂的相对结晶度下降,且钒卟啉对结晶度的影响大于镍卟啉；镍卟啉对再生催化剂的活性影响不大,而钒卟啉对再生催化剂的活性有一定程度的影响.%To study the impact of metalloporphyrins on the product distribution and catalyst performance in catalytic cracking process, nickel and vanadium porphyrins were separated from Venezuela 380 heavy oil and Yichang pipeline oil residue, and then added into feedstock with various proportions. The evaluation tests were conducted in a fixed fluidized bed device and the results showed that with the increase of nickel and vanadium porphyrins in heavy oil, the yields of gasoline and diesel fractions decreased significantly,at the same time,the yields of dry gas and coke increased. The selectivity to light oil trend to degrade,and the impact of nickel porphyrm seemed to be more significant. The relative crystallinity of the catalyst decreased due to the presence of nickel and vanadium porphyrins, in which the effect of vanadium porphyrin was greater. However, vanadium porphyrin exhibited negative impact on the activity of regenerated catalyst in someway while nickel porphyrin showed little.