A RMI-Ⅱ FCC catalyst tailored for MIP process,a FCC process variant for maximizing isoparaffin in cracked naphtha,was developed aiming at processing intermediate base feedstock.An AlRY zeolite having improved active sites accessibility as compared with the conventional REUSY zeolite was involved in catalyst preparation to provide the catalyst with good heavy oil crackability,coke selectivity and olefin reduction in cracked naphtha.The bench scale evaluation results showed that RMIⅡ catalyst exhibited improved bottoms conversion,good basic nitrogen tolerance,reduced olefin content in cracked naphtha and increased propylene yield when compared with the conventional FCC catalyst for processing intermediate base feedstock.The pilot plant scaleup results were successful and the catalyst could be easily manufactured in the existing catalyst plant facility.
