PRODUCTION OF PROPYLENE IN INSTALLATION OF CATALYTIC CRACKING WITH MOVABLE LAYER OF CATALYST Russian patent published in 2018 - IPC C10G11/00 C10G11/18 C07C4/06 

FIELD: technological processes.

SUBSTANCE: invention relates to a process for the catalytic cracking of hydrocarbons using a reactor-regenerator structure with a circulating fluidized bed to maximize the yield of propylene (C3-olefin). Method for increasing the yield of a C3-olefin in catalytic cracking with a moving bed of hydrocarbon feedstock catalyst, comprising: a) contacting a hydrocarbon feedstock in a primary reaction zone of a vertical pipe in the presence of a fluidized solid microsphere cracking catalyst to obtain cracked hydrocarbon products including the C4 hydrocarbon fraction and the spent catalyst; b) separating the spent catalyst from the cracked hydrocarbon products and stripping it in a reaction vessel to remove hydrocarbons trapped by the pores of the spent catalyst; c) separating the fraction of C4 hydrocarbons from the cracked hydrocarbon products to obtain a recycle fraction of C4 hydrocarbons; d) burning the coke deposited on the spent catalyst in a catalyst regenerator to produce a hot regenerated catalyst; e) recycling the portion of the hot regenerated catalyst to the primary reaction zone and cooling the remaining portion of the hot regenerated catalyst in the catalyst coolant to produce a cooled regenerated catalyst that is recycled to a secondary reaction zone upstream of the primary reaction zone of the vertical pipe; f) contacting the recycle fraction of C4 hydrocarbons with the cooled regenerated catalyst in the secondary reaction zone of the vertical pipe, performed at a lower temperature and a lower average hourly feed rate than in the primary reaction zone, in order to perform the oligomerization reaction of the olefin molecules of the recycling fraction of C4 hydrocarbon to produce oligomers; and g) raising the oligomers to the primary reaction zone of the vertical cracking tube to obtain a C3-olefin. Device for carrying out said method comprises: a) vertical pipe (101) having primary hydrocarbon cracking reaction zone (113) and secondary reaction zone (112), located upstream of the primary reaction zone, for oligomerization of the C4 hydrocarbon fraction; b) reaction vessel (102), connected to vertical pipe (101) for separating the cracked hydrocarbon products from the spent catalyst and stripping the spent catalyst; c) catalyst regenerator (105), placed downstream of reaction vessel (102), for regenerating the spent catalyst; and d) catalyst cooler (115), located downstream from catalyst regenerator (105) and upstream of riser (101), to cool a portion of the hot regenerated catalyst.

EFFECT: technical result is the creation of a modified method and device for maximizing the yield of propylene, facilitating the oligomerization reaction of the recirculating/external fraction of C4 hydrocarbons with higher selectivity, increasing the production of C3-olefin.

11 cl, 2 dwg, 1 ex, 2 tbl