Composite molecular sieve of TON or MRE configuration molecular sieve and MWW configuration molecular sieve as well as preparation method and application of composite molecular sieve

By growing all-silica MWW-configured molecular sieves on TON or *MRE-configured molecular sieves, a dual-microporous composite molecular sieve is formed, which solves the problems of single pore structure and excessive isomerization in the hydrogenation isomerization of long-chain alkanes, and realizes isomerization reaction with high selectivity and high yield.

CN122010130APending Publication Date: 2026-05-12CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Application Number
CN202411598418.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-11
Publication Date
2026-05-12

AI Technical Summary

Technical Problem

Existing molecular sieves have a single pore structure in the hydroisomerization reaction of long-chain alkanes, which leads to the formation of multi-branched isomers, affecting product yield and properties, and the lack of selective active sites leads to over-isomerization.

Method used

By growing all-silica MWW-configured molecular sieves on TON or *MRE-configured molecular sieves, a dual-microporous composite molecular sieve is formed. The combination of interconnected variable-diameter pores with different pore sizes restricts the isomerization reaction to occur at the pore opening, inhibits non-selective active sites, and avoids excessive isomerization.

Benefits of technology

It improves the selectivity and yield of monomethyl branched isomers, reduces the formation of polymethyl branched isomers, and improves the selectivity of the isomerization reaction and the quality of the products.

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Abstract

The manufacturing method of the composite molecular sieve comprises the following steps: providing a first molecular sieve comprising a first template agent (such as manufacturing the first molecular sieve comprising the first template agent in the presence of the first template agent), and then producing a second molecular sieve in the presence of a second template agent and the first molecular sieve comprising the first template agent, obtaining the composite molecular sieve wherein the first template agent and the second template agent differ in chemical structure, and the first molecule is screened from at least one of a TON-configuration molecular sieve and a * MRE-configuration molecular sieve (preferably selected from at least one of a ZSM-22 molecular sieve and a ZSM-48 molecular sieve), and the second molecular sieve is an MWW-configuration molecular sieve (preferably an all-silicon MWW-configuration molecular sieve, in particular an all-silicon MCM-22 molecular sieve). The composite molecular sieve provided by the invention can realize the purpose of directionally generating a monomethyl branched chain isomer product, and the quality of the isomer product is obviously improved.
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