Apparatuses and methods for cracking hydrocarbons

摘要

Methods and apparatuses are provided for cracking a hydrocarbon. The method includes contacting a first hydrocarbon stream with a first cracking catalyst at a first cracking temperature in a first riser to produce a first riser effluent and a first spent catalyst. A second hydrocarbon stream is contacted with a second cracking catalyst at a second cracking temperature in a second riser to produce a second riser effluent and a second spent catalyst, where the second cracking temperature is less than the first cracking temperature. The first riser effluent and the second riser effluent are combined to produce a mixed riser effluent, and the mixed riser effluent is fractionated in a fractionation zone to produce a light cycle oil. The first spent catalyst and the second spent catalyst are combined in a reactor to produce a mixed spent catalyst.

主权项

1. A method of cracking hydrocarbons comprising:
contacting a first hydrocarbon stream with a first cracking catalyst at a first cracking temperature in a first riser to produce a first riser effluent and a first spent catalyst; contacting a second hydrocarbon stream with a second cracking catalyst at a second cracking temperature in a second riser to produce a second riser effluent and a second spent catalyst, wherein the second cracking temperature is less than the first cracking temperature and the second hydrocarbon stream comprises about 75 mass percent or more of glycerides, fatty acids or combinations thereof; combining the first riser effluent and the second riser effluent to produce a mixed riser effluent; combining the first spent catalyst and the second spent catalyst in a reactor to produce a mixed spent catalyst; and fractionating the mixed riser effluent in a fractionation zone to produce a light cycle oil.