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Method for synthesizing amine-free ZSM (zeolite socony mobil)-5 molecular sieve

A technology of ZSM-5 and synthesis method, which is applied in the direction of crystalline aluminosilicate zeolite, borocarbane silicone crystalline aluminosilicate zeolite, etc., can solve the problem of increasing water volume, difficulty in increasing the yield of synthetic molecular sieve, and easy occurrence of mordenite and Quartz and other problems to achieve the effect of simplifying the synthesis steps

Inactive Publication Date: 2012-10-31
SHANDONG QILU HUAXIN HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

ZSM-5 molecular sieve is a kind of molecular sieve with relatively high silicon-aluminum ratio. If the reaction gel mixture is too thick and the amount of water is increased, impurities such as mordenite and quartz are prone to appear, which will affect the purity and yield of the synthesized ZSM-5 molecular sieve.
When synthesizing ZSM-5 molecular sieve as mentioned in CN1187462, the silicon-aluminum ratio in the general feeding intake is up to 1500, and the silicon-water ratio is 30, according to the conventional method, is subjected to the restriction of reaction gel mixture, and the productive rate when synthesizing molecular sieve is difficult to improve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In 205 grams of deionized water, add 800 grams of water glass solution (containing SiO 2 19.9%, containing Na 2 O 6.3%), add 50 grams of solid silica gel (containing SiO 2 89.3%), after beating evenly, add 128 grams of aluminum sulfate solution (containing Al 2 o 3 7.2%), add 12 grams of ZSM-5 molecular sieve produced by amine method, after mixing and beating, crystallize at 180°C, and the crystallization reaction ends after 20 hours, and the material is exchanged and washed with 0.5N hydrochloric acid to obtain hydrogen ZSM-5 Molecular sieve.

Embodiment 2

[0024] Add 58 grams of solid aluminum sulfate in 382 grams of deionized water, after dissolving, add 1049 grams of water glass solution (containing SiO 2 19.9%, containing Na 2 O 6.3%), add 68 grams of solid silica gel (containing SiO 2 89.3%), then add 15 grams of amine-free ZSM-5 molecular sieves produced by the method of the present invention, after mixing and beating, crystallize at 170 ° C, and end the crystallization reaction after 32 hours. After the material is exchanged and washed with 1N hydrochloric acid, hydrogen-form ZSM is obtained. -5 molecular sieves.

Embodiment 3

[0026] In 108 grams of deionized water, add 753 grams of water glass solution (containing SiO 2 19.9%, containing Na 2 O 6.0%), add 79 grams of silica gel slurry (containing SiO 2 28.7%), after beating evenly, add 77 grams of aluminum sulfate solution (containing Al 2 o 3 6.8%), adding 7 grams of ZSM-5 molecular sieves produced by the amine method, after mixing and beating, crystallize at 160 ° C, and the crystallization reaction ends after 28 hours. After the material is exchanged and washed with 1% dilute sulfuric acid, the hydrogen ZSM- 5 molecular sieves.

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Abstract

The invention discloses a method for synthesizing an amine-free ZSM (zeolite socony mobil)-5 molecular sieve. Silica gel and water glass are used as mixed silicon source, aluminum sulfate is used as an aluminum source, and the amine-free ZSM-5 molecular sieve is synthesized by the amine-free method. The method for synthesizing the amine-free ZSM-5 molecular sieve has the advantages that operation is simple, emission of pollutants is prevented, ZSM-5 molecular sieve synthesis efficiency can be greatly improved, relative crystallinity and specific surface area of the obtained product are higher than those of an amine-free ZSM-5 molecular sieved prepared by the conventional method.

Description

technical field [0001] The invention belongs to the synthesis method of MFI type molecular sieve ZSM-5. Background technique [0002] Mobil Petroleum Company of the United States announced the invention of ZSM-5 molecular sieve in USP3702886 in 1972. Due to its high silicon-aluminum ratio, unique pore structure and excellent thermal stability and hydrothermal stability, it has been used in hydrocarbons. Shape-selective catalysis, alkylation, isomerization, aromatization, disproportionation, catalytic cracking, catalytic dewaxing, etherification and other petrochemical processes have been widely used. [0003] From the perspective of the raw materials used in the preparation of ZSM-5 molecular sieve, it mainly includes silicon source, aluminum source, organic template agent, alkali, water, etc., among which organic template agent accounts for a large proportion in the synthesis cost of ZSM-5 molecular sieve. For a long time, organic amines were considered as essential raw ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/38
Inventor 刘环昌袁忠勇王震宇李牛明曰信陈文勇
Owner SHANDONG QILU HUAXIN HIGH TECH