METHOD OF INCREASING OUTPUT OF LIGHT OLEFINS FROM HYDROCARBON MATERIAL THROUGH CATALYTIC CRACKING Russian patent published in 2011 - IPC C07C4/06 C10G11/00 C07C11/04 C07C11/06 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of increasing output of light olefin hydrocarbons from hydrocarbon material through catalytic cracking, involving (a) feeding hydrocarbon material in form of naphtha or kerosene and water vapour into a catalytic cracking furnace, where the hydrocarbon material undergoes a catalytic cracking reaction in the presence of a catalyst; (b) regenerating the catalyst used in the catalytic cracking reaction through continuous or periodic regeneration, and repeated use of (recycling) of the regenerated catalyst in the catalytic cracking furnace: (c) fast cooling, compression and separation of the catalytic cracking reaction product in order to separate and extract hydrogen, methane and C2-C3 olefin hydrocarbons and to separate into a stream containing C2-C3 paraffin hydrocarbons and a stream which contains C4+ hydrocarbons; (d) feeding the stream which contains C2-C3 paraffin hydrocarbons into the furnace for recycling, where the stream is converted to C2-C3 olefin hydrocarbons through a thermal cracking reaction, and recycling the converted C2-C3 olefin hydrocarbons to the fast cooling step; (e) recycling at least a portion of the C4-C5 hydrocarbons of the stream which contains C4+ hydrocarbons to the catalytic cracking reaction step, where the output of ethylene and propylene obtained through catalytic cracking of recycled C4-C5 hydrocarbons is higher than the output of ethylene and propylene obtained through catalytic cracking of naphtha or kerosene, wherein the catalytic cracking reaction is carried out at temperature 500-750°C and weight ratio of naphtha or kerosene to water vapour is equal to 0.01-10 and the dwell time of naphtha or kerosene is equal to 0.1-600 seconds and the weight ratio of the catalyst to naphtha or kerosene of the hydrocarbons is equal to 1-100.

EFFECT: high output of light olefins.

4 cl, 4 ex, 8 tbl, 2 dwg