Method for preparing fine grain ZSM-5/mordenite composite molecular sieve

A technology of composite molecular sieve and mordenite, which is applied in molecular sieve catalysts, chemical instruments and methods, hydrocarbon cracking and hydrocarbon production, etc., can solve the problems of low yield of ethylene propylene, large molecular sieve crystals, easy coking, etc., and achieves good catalytic performance, Large specific surface area, the effect of preventing carbon deposition
CN101190418AActive Publication Date: 2008-06-04CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2008-06-04

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Abstract

The invention relates to the preparation method of a small crystal ZSM-5 / mordenite composite molecular sieve, mainly solving the problems in the existing preparation process of ZSM-5 / mordenite composite molecular sieve of bigger crystal of the composite molecular sieve, low catalytic activity and fast activity loss in the reaction in which ethene and propylene are prepared by the catalyzing and cracking of naphtha. The invention well resolves the problems by adopting the technical proposal that the ZSM-5 with decent silica alumina ratio and the crystal seed of mordenite is added in the synthetic process of the molecular sieve and the PH value of the molecular sieve raw material solution system is adjusted to 9-14 in the preparation process. The ZSM-5 / mordenite composite molecular sieve prepared by the method can be applied in the industrial production, in which ethene and propylene are prepared by the catalyzing and cracking of naphtha.
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Description

technical field

[0001] The invention relates to a preparation method of a small-grain ZSM-5 / mordenite composite molecular sieve. Background technique

[0002] As the leader of the petrochemical industry, ethylene propylene plays a pivotal role in the development of the national economy. At present, naphtha (or ethane) is mainly used as raw material and produced by steam cracking technology. However, the process requires a high reaction temperature, high energy consumption, and requires expensive high-temperature-resistant materials to prepare reactors and accessories. The operation cycle is short, the life of the furnace tube is short, and the product yield is low. The preparation of ethylene by catalytic cracking reaction has the advantages of low reaction temperature, high product yield and low investment. Among the catalytic cracking catalysts developed to produce ethylene propylene, most of them use ZSM-5 molecular sieve or mordenite as the catalyst. However, because...

Claims

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