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Method for preparing ZSM-5/mercerization zeolite symbiosis molecular screen

A technology of symbiotic molecular sieve and mordenite, which is applied in the direction of mercerized crystalline aluminum silicate zeolite, molecular sieve catalyst, chemical instruments and methods, etc., can solve serious problems such as high cost of molecular sieve, environmental pollution, etc., and achieve reduction in synthesis cost, exemption from emissions, Effect of reducing environmental pollution

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

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that a template agent needs to be added in the existing technology of synthesizing symbiotic molecular sieves, the cost of molecular sieves is relatively high, and the technical problems of serious environmental pollution in the synthesis process provide a new ZSM-5 / mordenite symbiotic molecular sieve preparation method

Method used

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  • Method for preparing ZSM-5/mercerization zeolite symbiosis molecular screen
  • Method for preparing ZSM-5/mercerization zeolite symbiosis molecular screen
  • Method for preparing ZSM-5/mercerization zeolite symbiosis molecular screen

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Embodiment 1

[0021] 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 uniformly mixed, 100 g of ethylenediamine was added under stirring, and stirred until uniform. The pH value was adjusted to 10.5 with 30% sulfuric acid solution, and then continued to stir until uniform, and conventional hydrothermal crystallization was performed at 160° C. for 15 hours. After the product is filtered and washed, it is dried at 130°C for 4 hours and roasted at 550°C for 3 hours to obtain the required seed crystal of the present invention, denoted as M1, and the ratio of the precursor containing ZSM-5 molecular sieve in the seed crystal in weight percentage About 95%.

Embodiment 2

[0023] 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

[0028] 540 g of silica sol was dissolved in 1500 g of deionized water and 90 ml of 3 mol / L sodium hydroxide solution was added under stirring until uniform. Then 28.8 g of sodium metaaluminate was dissolved in 900 ml of deionized water, then added to the aforementioned solution and stirred until uniform. Then 22 g of seed crystals M1 were added with stirring. The ZSM-5 synthesis system is continuously stirred evenly, and then the pH value of the synthesis system is adjusted to 11.5 with dilute acid. Conventional hydrothermal synthesis was carried out at 180°C for 40 hours. After the product was washed by filtration, it was exchanged for ammonium in 1000 ml of a 10% by weight ammonium nitrate solution at 90° C. for 2 hours. The product was filtered, washed, dried at 130°C for 2 hours and then exchanged with ammonium again. After filtering, washing and drying at 130°C for 3 hours, it was calcined at 550°C for 5 hours. Promptly obtain the catalyst provided by the present inve...

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Abstract

The invention relates to a method of preparing a symbiotic molecular sieve of ZSM-5 / mordenite, which aims at solving the problems of high synthesis cost and serious environmental pollution caused by adding templates in the synthesis process of the molecular sieve in prior art. By adding crystal seed which contains ZSM-5 and mordenite precursors in the synthesis process of the molecular sieve and controlling the mole composition and PH value of the synthetic solution of the molecular sieve precursors, the symbiotic molecular sieve consisting of ZSM-5 and mordenite can be prepared without using templates, which well solved the problems. The symbiotic molecular sieve can be used in the industrial production of ethylene and propylene by using naphtha catalytic cracking.

Description

technical field [0001] The invention relates to a preparation method of ZSM-5 / mordenite symbiotic 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 the two molec...

Claims

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Application Information

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IPC IPC(8): C01B39/04C01B39/26C01B39/38B01J29/04
Inventor 胡永君马广伟谢在库陈亮杨霞琴
Owner CHINA PETROLEUM & CHEM CORP
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