The influence of operating parameters on ethylene content in dry gas obtained during catalytic cracking of gasoline was investigated in a pilot fixed fluidized bed reactor in the presence of the MMC-2 catalyst.The res...The influence of operating parameters on ethylene content in dry gas obtained during catalytic cracking of gasoline was investigated in a pilot fixed fluidized bed reactor in the presence of the MMC-2 catalyst.The results have shown that the majority of dry gas was formed during the catalytic cracking reaction of gasoline,with a small proportion of dry gas being formed through the thermal cracking reaction of gasoline.The ethylene content in dry gas formed during the catalytic cracking reaction was higher than that in dry gas formed during the thermal cracking reaction.The ethylene content in dry gas formed during catalytic cracking of gasoline with a higher olefin content was higher than that in dry gas formed during catalytic cracking of gasoline with a lower olefin content,which meant that the higher the amount of carbonium ions was produced during the reaction,the higher the ethylene content in the dry gas would be.An increasing reaction temperature could increase the percentage of dry gas formed during thermal cracking reaction in total dry gas products,leading to decreased ethylene content in the dry gas.An increasing catalyst/oil ratio could be conducive to the catalytic cracking reactions taking place inside the zeolite Y,leading to a decreased ethylene content in the dry gas.A decreasing space velocity could be conducive to the catalytic cracking reactions taking place inside the shape-selective zeolite,leading to increased ethylene content in the dry gas.展开更多
The influence of zeolite structure and process parameters(including reaction temperature and catalyst/oil ratio)on rules for formation of ethylene and propylene in the course of catalytic pyrolysis of n-heptane was st...The influence of zeolite structure and process parameters(including reaction temperature and catalyst/oil ratio)on rules for formation of ethylene and propylene in the course of catalytic pyrolysis of n-heptane was studied in a small-scale fixed fluid catalytic cracking unit.Test results have revealed that compared to the USY zeolite and Beta zeolite,the catalytic pyrolysis of n-heptane in the presence of the ZRP zeolite catalyst can result in higher yield and selectivity of ethyl-ene and propylene,while a higher reaction temperature and a higher catalyst/oil ratio can promote the formation of ethylene and propylene during catalytic pyrolysis of n-heptane.The ethylene formation reaction is more sensitive to the changes in reaction temperature,whereas the changes in catalyst/oil ratio are more influential to the propylene formation reaction.This paper has made a preliminary exploration into the different reaction pathways for formation of ethylene and propylene on zeolites with different structures.展开更多
文摘The influence of operating parameters on ethylene content in dry gas obtained during catalytic cracking of gasoline was investigated in a pilot fixed fluidized bed reactor in the presence of the MMC-2 catalyst.The results have shown that the majority of dry gas was formed during the catalytic cracking reaction of gasoline,with a small proportion of dry gas being formed through the thermal cracking reaction of gasoline.The ethylene content in dry gas formed during the catalytic cracking reaction was higher than that in dry gas formed during the thermal cracking reaction.The ethylene content in dry gas formed during catalytic cracking of gasoline with a higher olefin content was higher than that in dry gas formed during catalytic cracking of gasoline with a lower olefin content,which meant that the higher the amount of carbonium ions was produced during the reaction,the higher the ethylene content in the dry gas would be.An increasing reaction temperature could increase the percentage of dry gas formed during thermal cracking reaction in total dry gas products,leading to decreased ethylene content in the dry gas.An increasing catalyst/oil ratio could be conducive to the catalytic cracking reactions taking place inside the zeolite Y,leading to a decreased ethylene content in the dry gas.A decreasing space velocity could be conducive to the catalytic cracking reactions taking place inside the shape-selective zeolite,leading to increased ethylene content in the dry gas.
文摘The influence of zeolite structure and process parameters(including reaction temperature and catalyst/oil ratio)on rules for formation of ethylene and propylene in the course of catalytic pyrolysis of n-heptane was studied in a small-scale fixed fluid catalytic cracking unit.Test results have revealed that compared to the USY zeolite and Beta zeolite,the catalytic pyrolysis of n-heptane in the presence of the ZRP zeolite catalyst can result in higher yield and selectivity of ethyl-ene and propylene,while a higher reaction temperature and a higher catalyst/oil ratio can promote the formation of ethylene and propylene during catalytic pyrolysis of n-heptane.The ethylene formation reaction is more sensitive to the changes in reaction temperature,whereas the changes in catalyst/oil ratio are more influential to the propylene formation reaction.This paper has made a preliminary exploration into the different reaction pathways for formation of ethylene and propylene on zeolites with different structures.
