Method for synthesizing MFI type zeolite from Magadiite

A technology of zeolite and mixture, which is applied in the field of synthesizing MFI zeolite, can solve the problems of alkali addition and large amount of template agent, and achieve the effect of less dosage and high purity

Active Publication Date: 2015-03-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] What the present invention is to solve is the problem that in the existing MFI-type zeolite preparation technology, the amount of template agent is large, the need to add alkali, and the corresponding hydrogen-type molecular sieve can be prepared after ammonium ion exchange is required, and a new method of using Magadiite to synthesize MFI-type zeolite is provided. The method has the advantages of less dosage of quaternary ammonium salt template, no need to add hydroxide in the reaction system, high purity of the obtained MFI zeolite product, and no need for ammonium ion exchange to prepare hydrogen-type molecular sieves.

Method used

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  • Method for synthesizing MFI type zeolite from Magadiite
  • Method for synthesizing MFI type zeolite from Magadiite
  • Method for synthesizing MFI type zeolite from Magadiite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]With 0.2932 grams of NaF, 1.6762 grams of 30wt% sodium hydroxide aqueous solution, 10 grams of 50wt% PEG 300 (polyethylene glycol with an average molecular weight of about 300) solution, 10.3 grams of water and 8.1 milliliters of 40wt% silica sol The solution is mixed evenly, and the molar ratio of the resulting mixture is:

[0032] 10SiO 2 : 1.0NaF: 0.9Na 2 O: 2.5PEG 300: 175H 2 o

[0033] Move the above mixture into the reactor at 160 o C was crystallized for 86 hours, washed and dried after the reaction, and was identified as Magaditte material by XRD.

[0034] The above-mentioned Magadiite of 2.0 grams is mixed with 0.8 gram of TPABr and 10 milliliters of deionized water, and the molar proportion of mixed slurry is:

[0035] TPABr / SiO 2 =0.09,H 2 O / SiO 2 =16.67

[0036] Then the above-mentioned slurry is placed in a closed reactor, at 150 o C for 40 hours of crystallization, the solid product was identified as MFI zeolite by XRD after washing and drying.

...

Embodiment 2

[0039] With 0.2932 grams of NaF, 1.6762 grams of 30wt% sodium hydroxide aqueous solution, 10 grams of 50wt% PEG 300 (polyethylene glycol with an average molecular weight of about 300) solution, 10.3 grams of water and 8.1 milliliters of 40wt% silica sol The solution is mixed evenly, and the molar ratio of the resulting mixture is:

[0040] 10SiO 2 : 1.0NaF: 0.9Na 2 O: 2.5PEG 300: 175H 2 o

[0041] Move the above mixture into the reactor at 160 o C was crystallized for 86 hours, washed and dried after the reaction, and was identified as Magaditte material by XRD.

[0042] The above-mentioned Magadiite of 2.0 grams is mixed with 0.8 gram of TPABr and 10 milliliters of deionized water, and the molar proportion of mixed slurry is:

[0043] TPABr / SiO 2 =0.09,H 2 O / SiO 2 =16.67

[0044] Then the above-mentioned slurry is placed in a closed reactor, at 130 o C for 60 hours of crystallization, the solid product was identified as MFI zeolite by XRD after washing and drying. ...

Embodiment 3

[0047] With 0.2932 grams of NaF, 1.6762 grams of 30wt% sodium hydroxide aqueous solution, 10 grams of 50wt% PEG 300 (polyethylene glycol with an average molecular weight of about 300) solution, 10.3 grams of water and 8.1 milliliters of 40wt% silica sol The solution is mixed evenly, and the molar ratio of the resulting mixture is:

[0048] 10SiO 2 : 1.0NaF: 0.9Na 2 O: 2.5PEG 300: 175H 2 o

[0049] Move the above mixture into the reactor at 160 o C was crystallized for 86 hours, washed and dried after the reaction, and was identified as Magaditte material by XRD.

[0050] The above-mentioned Magadiite of 2.0 grams is mixed with 0.8 gram of TPABr and 10 milliliters of deionized water, and the molar proportion of mixed slurry is:

[0051] TPABr / SiO 2 =0.09,H 2 O / SiO 2 =16.67

[0052] Then the above-mentioned slurry is placed in a closed reactor, at 180 o C for 24 hours of crystallization, the solid product was identified as MFI zeolite by XRD after washing and drying. ...

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Abstract

The invention relates to a method for synthesizing MFI type zeolite from Magadiite, for mainly solving the problems that in the existing MFI type zeolite preparation technique a great amount of template agent is used, alkali needs to be added, and a corresponding hydrogen type molecular sieve can only be prepared after ammonium ion exchange. According to the technical scheme, the method comprises the following steps: mixing Magadiite, quaternary ammonium salt Q and water in the following ratios: the ratio of quaternary ammonium salt Q to SiO2 is 0.01 to 0.20, and the ratio of H2O to SiO2 is 1 to 50, thereby obtaining a mixture; crystallizing the mixture for 2-90 hours at 120-190 DEG C, and washing and drying a crystallization product, thereby obtaining MFI type zeolite, wherein the quaternary ammonium salt is a compound as shown in the formula R4N+X-, in the formula, R is selected from at least one of the alkyl with the carbon atom number of 1-20; X- is at least one of C1-, Br- and I-, the technical problems are relatively well solved, and the method can be used in industrial production for preparing MFI type zeolite.

Description

technical field [0001] The invention relates to a method for synthesizing MFI zeolite by using Magadiite, in particular a method for synthesizing MFI zeolite by using Magadiite as a silicon source and an aluminum source. Background technique [0002] Zeolite molecular sieves are widely used due to their unique pore shape selectivity, unique solid acid properties and excellent ion exchange properties, and have shown their great commercial application value in adsorption, separation and catalysis. For example, in the field of petroleum refining and chemical industry, the application of Y zeolite has brought a sudden revolution to petroleum catalytic cracking technology, while other molecular sieve catalysts, such as ZSM-5 zeolite, mordenite, β zeolite, MCM-22 zeolite , The application of SAPO-34 molecular sieves has also brought substantial breakthroughs to important petroleum refining and chemical technologies such as cracking, reforming, isomerization, aromatics disproportio...

Claims

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Application Information

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IPC IPC(8): C01B39/04
CPCC01B39/48C01P2002/72C01P2004/03
Inventor 袁志庆陶伟川陈康成滕加伟
Owner CHINA PETROLEUM & CHEM CORP
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