The invention discloses a catalytic
conversion method for preparing
ethylene, propylene and
aromatic hydrocarbon.
Hydrocarbon raw material with different
cracking performances is contacted with a catalytic
cracking catalyst, and
cracking reaction is carried out in a
fluidized bed reactor under the conditions that the temperature is 550 DEG C to 800 DEG C, the weight hourly
space velocity is 0.1-800h<-1>, the reaction pressure is 0.10MPa to 1.0MPa, the weight ratio of the catalytic cracking catalyst and the
raw material is 10-150, and the weight ratio of steam and the
raw material is 0.15-1.0.Then a spent catalyst and reaction oil gas are separated, the spent catalyst returns to the reactor after regeneration, and the target products comprising low carbon olefin and the
aromatic hydrocarbon are obtained by separating the reaction oil gas, wherein, fraction with the temperature to be 160 DEG C to 260 DEG C returns for catalytic cracking as circulating material, and the
ethylene and the propylene are further obtained by cracking of ethane,
propane,
butane, and the steam entered. Low carbon olefin such as
ethylene, propylene, and the like, is produced from heavy feedstock to the utmost extent in the method, and the yield of the ethylene and the propylene is over 20% by weight, in addition, the
aromatic hydrocarbon such as
toluene,
xylene, and the like, are produced in an integrated way.