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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

Active Publication Date: 2008-06-04
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the molecular sieve crystal grain of synthesis existing in prior art synthesis ZSM-5 / mordenite composite molecular sieve is big, and catalytic activity is lower, It is used for the problems of easy coking, rapid catalyst deactivation and low yield of ethylene propylene in the reaction process of catalytic cracking to ethylene propylene, and provides a new preparation method of small crystal ZSM-5 / mordenite composite molecular sieve

Method used

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

Examples

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Embodiment 1

[0019] Get 1137 grams of sodium metasilicate and dissolve in 1800 grams of deionized water. In addition, 89 grams of aluminum sulfate was dissolved in 350 grams of deionized water, and added into the sodium silicate solution under stirring. After the solution was mixed evenly, 100 g of ethylenediamine was added under stirring. After stirring evenly, the pH value was adjusted to 10.5 with 30% sulfuric acid solution, and then the stirring was continued until uniform. Conventional hydrothermal crystallization was carried out at 160° C. for 15 hours. After washing, the product was dried at 130°C for 4 hours, and then roasted at 550°C for 3 hours to obtain the required seed crystal of the present invention, denoted as M1, and the proportion of the precursor containing ZSM-5 molecular sieve in the seed crystal was about 95%.

Embodiment 2

[0021] According to the method and content provided in Example 2, the sodium metaaluminate addition is changed to 133.4 grams to obtain the required seed crystal of the present invention, which is denoted as M2, and contains the precursor of ZSM-5 molecular sieve in the seed crystal in weight percentage The body ratio is about 85%.

Embodiment 3

[0023] Dissolve 540 g of silica sol in 3000 g of deionized water and add 240 ml of 3 mol / L sodium hydroxide solution until uniform. Then 28.8 g of sodium metaaluminate was added into 1800 ml of deionized water to dissolve, then added to the aforementioned solution and stirred until uniform. Then, 96 grams of n-butylamine and 22 grams of seed crystal M1 were added under stirring. Raw material composition ratio is: SiO 2 : 0.049Al 2 o 3 : 0.1Na 2 O: 0.36M: 82H 2 O: 0.1M1, adjust the pH value of the solution to 11.5 with dilute sulfuric acid. The composite molecular sieve synthesis system was continuously stirred evenly and then conventional hydrothermal synthesis was carried out at 160° C. for 30 hours. The product was filtered and washed, dried at 130°C for 3 hours and then calcined at 550°C for 5 hours. The product was taken out and exchanged for ammonium at 90° C. for 2 hours in 1000 ml of 10% by weight ammonium nitrate solution. The product was filtered, washed, drie...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/80C07C4/06C07C11/04C07C11/06
CPCY02P20/52
Inventor 胡永君谢在库马广伟姚晖肖景娴
Owner CHINA PETROLEUM & CHEM CORP
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