Fast synthesis process of strong acid-type ZSM-5 molecular sieve

A technology of ZSM-5 and strong acid type, which is applied in the field of rapid synthesis of strong acid type ZSM-5, which can solve the problems of long synthesis period and limited amount of strong acid, and achieve the effect of short synthesis time

Inactive Publication Date: 2003-05-14
SYNFUELS CHINA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Usually adopt conventional hydrothermal synthesis method to synthesize ZSM-5 zeolite, as U.S.patent, 5240892 patent has: synthetic period is long, generally needs more than 100 hours; As Catalysis Today67 (2001): 109-119 although adopting directing agent method can be in 50 Molecular sieves with complete crystal forms can be synthesized within hours, but the amount of strong acid is limited, ≤0.3mmol / g as determined by TPD method. Molecular sieves

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A. Synthesis of Directing Agents

[0025] The molar ratio composition of the directing agent is SiO 2 :Al 2 o 3 :Na 2 O:R-NH 3 : Sulfuric acid: H 2 O=40:1:10:28:7.2:2800. The composition of the silicon source is: SiO 2 = 25.13%; Na 2 O = 8.12%; H 2 O=66.75% water glass, first take by weighing 600 grams of water glass, add 126.5 grams of n-butylamine and 1181.3 grams of deionized water, put it into the synthesis kettle, stir evenly under stirring at 300 rpm, and then weigh Get 41.82 grams of aluminum sulfate, put it into a beaker with 1561.4 grams of water, then add 15.8 grams of sulfuric acid, stir evenly with a glass rod, add it dropwise to the solution in the kettle, then seal the kettle and continue stirring for 10 - After 20 minutes it starts to heat up. In the first step, the temperature is raised from room temperature to 120°C at a rate of 2°C / min for 20 hours, and in the second step, the temperature is raised to 165°C at a rate of 10°C / hour, then the te...

Embodiment 2

[0030] A. Synthesis of Directing Agents

[0031] The raw material composition of the directing agent is SiO 2 : Al 2 o 3 :Na 2 O:R-NH 3 : Phosphoric acid: H 2 O=60:1:13:32:3.3:3000. The composition of the silicon source is: SiO 2 = 25.13%; Na 2 O = 8.12%; H 2 O=66.75% water glass, first weigh 600 grams of water glass, add 149.9 grams of 1,6 hexamethylenediamine and 728.9 grams of deionized water, put it into a synthesis kettle, and stir evenly under stirring at 300 rpm , then take by weighing 17.93 grams of aluminum nitrate, put it into a beaker with 1561.4 grams of water, then add 15.6 grams of phosphoric acid, stir it evenly with a glass rod, add it dropwise to the solution in the kettle, then seal the kettle, After continuing to stir for 10-20 minutes, the temperature began to rise. In the first step, the temperature is raised from room temperature to 120°C at a rate of 2°C / min for 20 hours, and in the second step, the temperature is raised to 165°C at a rate of 1...

Embodiment 3

[0036] A. Synthesis of Directing Agents

[0037] The raw material composition of the directing agent is SiO 2 : Al 2 o 3 :Na 2 O:R-NH 3 : Sulfuric acid: H 2 O=80:1:15:38:5.2:3800

[0038] The composition of the silicon source is: SiO 2 = 25.13%; Na 2 O = 8.12%; H 2 O=66.75% water glass, first weigh 600 grams of water glass, add 84.33 grams of ethylamine and 1181.3 grams of deionized water, put it into the synthesis kettle, stir evenly under stirring at 300 rpm, then weigh Put 41.82 grams of aluminum sulfate into a beaker with 1561.4 grams of water, then add 15.8 grams of sulfuric acid, stir evenly with a glass rod, add it dropwise to the solution in the kettle, then seal the kettle and continue stirring for 10- After 20 minutes the temperature started to rise. In the first step, the temperature is raised from room temperature to 120°C at a rate of 2°C / min for 20 hours, and in the second step, the temperature is raised to 165°C at a rate of 10°C / hour to cool down, and...

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PUM

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Abstract

The fast synthesis process of strong acid-type ZSM-5 molecular sieve includes compounding solution A with silicon source, template agent and one half of deionized water in certain proportion; compounding solution B with aluminum source, inorganic acid and the other half of deionized water in certain proportion; adding dropwise solution B to solution A to prepare guiding agent; compounding solution C with silicon source, template agent and one half of deionized water in certain proportio; compounding solutio D with aluminium source, inorganic acid and the other half of deionized water in certain proportion; adding dropwise solution D to solution C and adding guiding agent in the amount of 5-10 vol% of total amount. The process has advantages of short synthesis period and storing acidity.

Description

[0001] Field: [0002] The invention belongs to a method for synthesizing molecular sieves, in particular to a method for rapidly synthesizing strong acid type ZSM-5. Background technique: [0003] Zeolite science and technology is one of the hottest fields at present. ZSM-5 zeolite series is a kind of high silica zeolite widely studied. Its unique acidic system and shape selectivity have been the subject of many researchers. Its skeleton nSIO 2 / nAI 2 o 3 The specific range is 12--∞, the pore diameter is 5.4×5.6 , it is a Pentasil structure composed of eight five-membered rings, and the specific surface area generally reaches 400-600m 2 , with high selectivity and thermal stability. It is widely used in the conversion of various hydrocarbons, but because the molecular sieves synthesized by different methods have differences in acidity, grain size, specific surface area and even the distribution of Al components that affect their properties, the zeolite catalysts prepared ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40C01B39/38C01B39/40
Inventor 胡津仙王俊杰任杰李永旺孙予罕
Owner SYNFUELS CHINA TECH CO LTD
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