PROCESS AND SYSTEM FOR INCREASING OUTPUT OF LIGHT OLEFINS Russian patent published in 2025 - IPC C07C11/04 C07C5/333 C07C1/24 C10G11/05 B01J38/38 

FIELD: chemistry.

SUBSTANCE: invention relates to an integrated process with a circulating fluidised bed for simultaneous dehydration of ethanol and cracking of hydrocarbon material. Process involves: feeding hydrocarbon material (1) having a Conradson carbon residue (CCR) of not less than 4 wt.%, and regenerated catalyst (2), obtained from coke combustion chamber (a), into cracking reactor with fluidized bed (b); cracking of hydrocarbon material at temperature in range from 490 to 680 °C when depositing coke on a catalyst to obtain a reaction mixture containing products of vapourisation of hydrocarbons and a coke-loaded catalyst; separating the vaporous hydrocarbon products and the coke-loaded catalyst at the end of fluidized bed cracking reactor (b) and directing the vaporous hydrocarbon products for fractionation (3); purification of coke-loaded catalyst to remove non-separated vaporous hydrocarbon products contained therein; directing the coke-loaded catalyst obtained in purification step (4) and ethanol (5) into dehydration reactor (c) for dehydration of ethanol to ethylene and obtaining a mixture of products and a deactivated catalyst, where dehydration reactor (c) is maintained at a temperature in range of 300 to 600 °C, where mixture of products (6) is sent to cracking reactor with fluidized bed (b) for fractionation; directing deactivated catalyst (7) obtained at the dehydration step into coke combustion chamber (a) and burning coke on the deactivated catalyst in the presence of air or oxygen-containing gases (8) at a temperature in range of 600-700 °C to produce regenerated catalyst and flue gas (9); and circulation of regenerated catalyst (2) into cracking reactor with fluidized bed (b) for cracking hydrocarbon feedstock (1). Process simultaneously increases cracking of hydrocarbon material and dehydration of ethanol. Invention also relates to an integrated system.

EFFECT: present invention enables to maximize output of ethylene without additional heat removal.

16 cl, 2 dwg, 2 tbl, 3 ex