Catalytic cracking aid capable of promoting yield increase of propylene, and preparation method thereof

Abstract

The invention discloses a catalytic cracking aid capable of promoting yield increase of propylene, and a preparation method thereof. The catalytic cracking aid comprises, on the basis of dry base weight, 10 to 75 wt% of an IMF-structure molecular sieve containing phosphorus and loading metal in terms of the dry base weight, 3 to 40 wt% of a phosphorus-aluminum inorganic binder in terms of the drybase weight, 1 to 30 wt% of other inorganic binder in terms of oxide, 0 to 60 wt% of second clay in terms of the dry base weight and 0.5 to 15 wt% of a metallic additive in terms of oxide, wherein themetallic additive is at least one selected from a group consisting of group-VIII metal, manganese, zinc and gallium. The aid provided by the invention can effectively improve propylene yield and propylene selectivity when applied to catalytic cracking.

Description

technical field [0001] The disclosure relates to a catalytic cracking additive for increasing propylene production and a preparation method thereof. Background technique [0002] For a long time, ethylene, propylene and butene have been the basic organic chemical raw materials for synthetic resin, synthetic fiber and synthetic rubber, among which propylene is an important raw material for the manufacture of petrochemical products after ethylene. At present, the largest source of propylene at home and abroad is the main by-product of thermal cracking to produce ethylene. The second largest source of propylene is almost all from FCC units, which provide about 30% of the demand. In the United States, FCC units provide petrochemical products for propylene. About half of the demand. [0003] Due to the rapidly growing demand for polypropylene, the demand for propylene in the petrochemical industry is faster than that for ethylene, and the construction of ethylene plants is limit...

AI Technical Summary

Problems solved by technology

[0005] Although IM-5 molecular sieve can have high alkane cracking ability, it is the same as other ten-membered ring molecular sieves. Due to its narrow pore structure, it is difficult for larger reactant molecules such as polycyclic hydrocarbons to enter the crystal pore for reaction, reducing the The effective reaction area of ​​the molecular sieve reduces the reactivity of the molecular sieve; on the other hand, larger product molecules such as isoparaffins and aromatics are not easy to diffuse out of the pores of the molecular sieve, which causes secondary reactions such as excessive hydrogen transfer and coking, which lead to Molecular sieve deactivation, reduced reaction selectivity

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