EU-1/Beta composite molecular sieve, and catalyst for toluene disproportionation and transalkylation and application of catalyst

Abstract

The invention discloses an EU-1 / Beta composite molecular sieve, and a catalyst for toluene disproportionation and transalkylation and the application of the catalyst. The EU-1 / Beta composite molecular sieve has crystal phases of an EU-1 molecular sieve and a Beta molecular sieve. The structure of the composite molecular sieve is that the Beta molecular sieve tightly wraps around the EU-1 molecular sieve, wherein the EU-1 molecular sieve accounts for 30% to 70% weight percent of the composite molecular sieve. The catalyst for toluene disproportionation and transalkylation of the invention includes the above EU-1 / Beta composite molecular sieve, and the EU-1 / Beta composite molecular sieve accounts for 40% to 95% weight percent of the catalyst. The composite molecular sieve-containing catalyst for toluene disproportionation and transalkylation of the invention has excellent performance in use without carrying metal components, and has relatively high toluene conversion rate, and benzene and xylene (B + C8A) selectivity.

Description

technical field [0001] The invention relates to an EU-1 / Beta composite molecular sieve, a toluene disproportionation and alkyl transfer catalyst using the composite molecular sieve and its application. Background technique [0002] Toluene disproportionation and transalkylation technology is one of the most important processes in large-scale aromatics complexes, the purpose of which is to convert relatively surplus toluene and C 9 Aromatics are converted into benzene and xylenes, which are widely used but in short supply to meet market demand. In the chemical fiber-type modern aromatics complex, the toluene disproportionation unit plays a pivotal role, and its contribution of benzene and xylene accounts for 50% to 70% of the total benzene and xylene in the entire aromatics complex. [0003] Molecular sieve catalysts are usually used for the disproportionation of toluene and the transalkylation of aromatic hydrocarbons. The molecular sieves used in the prior art catalysts in...

AI Technical Summary

Problems solved by technology

[0006] To sum up, the existing toluene disproportionation and transalkylation catalysts all use molecular sieve as the carrier, and both need to load a certain amount of active metal components or adopt a special molecular sieve modification method, which increases the preparation steps of the catalyst and increases the cost of the catalyst.

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