COMPOSITION OF A FLUID-CATALYTIC CRACKING ADDITIVE FOR INCREASING THE OCTANE NUMBER OF GASOLINE AND METHOD FOR PRODUCTION THEREOF Russian patent published in 2021 - IPC B01J21/12 B01J21/16 B01J27/14 C10G11/18 B01J29/65 B01J29/80 B01J37/00 

FIELD: chemistry.

SUBSTANCE: present invention relates to a method for producing an additive, including the stages of: a) obtaining a suspension of clay and aluminium oxide: i) dispersing kaolin clay in demineralised water and a dispersing agent, wherein said dispersing agent constitutes a naphtalenesulfonic acid condensation product; ii) adding a pseudoboehmite-type aluminium oxide; iii) grinding the suspension for 2 hours, mixing homogeneously, and then adding ammonium polysilicate and grinding again for at least 30 minutes; and iv) gradually adding an organic acid followed by adding phosphoric acid while thoroughly mixing; b) obtaining a zeolite suspension using more than one zeolite: i) dissolving diammonium hydrogen phosphate in demineralised water to produce a zeolite suspension; adding a ZSM-5 zeolite with SiO₂/Al₂O₃ in the range from 30 to 280 to the demineralised water while mixing; and ii) dissolving the diammonium hydrogen phosphate in demineralised water to obtain a zeolite suspension; adding a ZSM-5 zeolite with SiO₂/Al₂O₃ to the demineralised water while mixing; wherein the molar ratio of SiO₂/Al₂O₃ is different from stage (i); c) obtaining a finished catalytic suspension: i) mixing the zeolite suspension with a suspension of clay and aluminium oxide and stirring for 30 minutes; ii) adding ammonium polysilicate to the suspension mixed in stage i) of stage c), and optionally adding a divalent metal precursor dissolved in demineralised water; and iii) screening the suspension obtained in stage ii) of stage c), spray drying and calcinating the spray-dried product at a temperature of 550°C. The invention also relates to a composition of a fluid-catalytic cracking additive obtained by the above method, wherein said composition of the fluid-catalytic cracking additive is configured to increase the octane number of gasoline.

EFFECT: optimising a typical combination of an MFI-type zeolite with different ratio of SiO₂/Al₂O₃ to maintain the output of gasoline and increase the octane number of gasoline, leading to increasing the selectivity by light olefins and aromatic compounds in the product; in the modification of acidic centres of the additive using divalent metal selected from the Group IIA and Group IB to ensure the selectivity by light olefins and aromatic compounds.

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