Catalyst for C8 aromatics isomerization reaction technology and preparation method thereof

Abstract

The invention relates to a catalyst for C8 aromatics isomerization reaction technology and a preparation method thereof. The composite reaction catalyst compounded by two different molecular sieve components modified by different methods according to a certain ratio, wherein one component has high-selectivity catalytic action on xylene isomerization and the other component has shape selective catalysis action on ethylbenzene deethylation. Due to the high-selectivity catalytic action of the composite molecular sieve catalyst, high-selectivity catalysis for dealkylation reaction of ethylbenzenein C8 mixed aromatics and the reaction that m-xylene and o-xylene are isomerized into p-xylene can be simultaneously realized. In the reaction technology of isomerization and dealkylation in the C8 mixed aromatics, a fixed bed reactor is adopted, the C8 mixed aromatics are taken as raw materials (an aromatic mixture mainly comprises m-xylene, o-xylene and ethylbenzene) and subjected to reaction at the temperature of between 350 and 460 DEG C and the airspeed of 2.5 to 15h<-1> and under the pressure of 0.5 to 3.0MPa. The reaction catalyst has high reaction activity, selectivity and stability, simplifies the process flow of the reaction and can obviously reduce the energy consumption and production cost.

Description

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AI Technical Summary

Benefits of technology

In this new type of catalytic material called Molecules Sieve (MS), it was discovered that by adding certain substances into an organic compound mixture containing benzenes or naphthols, they could effectively separate different types of chemical components from each other without affecting their properties such as structure or reactiveness. These materials were found effective even when combined together under specific conditions during synthesis processes. They showed improved efficiency over traditional methods like acid treatment alone while maintaining excellent performance on various products produced through these techniques.

Problems solved by technology

Technological Problem addressed in this patents is how efficiently produce para-mtoluenced naphtha (C10+M/ZL) through decomposition of aliphered compounds called phytanes during pyridine formation processes like dimerization and decislation of α-,β-unsaturated carboxylic acids (α,ω)-dimensiloxynanone). Current methods involve expensive metals and zeolite catalysis systems, leading to increased costs associated therewith.

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