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Method for preparing SAPO-34 molecular sieve, SAPO-34 molecular sieve and application of SAPO-34 molecular sieve

A SAPO-34 and molecular sieve technology, applied in the field of molecular sieves, can solve the problems of metal loss, poor hydrothermal stability, and uneven distribution of metal oxides, and achieve high ethylene and propylene selectivity, slow deactivation rate, and high crystallinity Effect

Active Publication Date: 2012-07-11
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Modulating the acidity of SAPO-34 molecular sieve by metal modification may cause uneven distribution of metal oxides in the lattice or uneven loading of metal ions in the framework. In addition, the hydrothermal stability of metal modified SAPO-34 molecular sieve Poor performance, the metal is easy to lose during the catalytic MTO reaction
It is an effective method to adjust the acid density and acid strength of the SAPO-34 molecular sieve by changing the raw material amount of the raw silica sol in the mixture, but in this process, due to the different silicon content, the crystallinity, particle size, and hydrothermal stability of the molecular sieve are affected. have an impact
The acidity is adjusted by hydrothermal treatment, which increases the subsequent treatment operations and increases the production cost of molecular sieves

Method used

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  • Method for preparing SAPO-34 molecular sieve, SAPO-34 molecular sieve and application of SAPO-34 molecular sieve
  • Method for preparing SAPO-34 molecular sieve, SAPO-34 molecular sieve and application of SAPO-34 molecular sieve
  • Method for preparing SAPO-34 molecular sieve, SAPO-34 molecular sieve and application of SAPO-34 molecular sieve

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The silicon source and phosphorus source are mixed first, and then the basic composite template formed by aluminum source, organic amine and fluoride is added in sequence.

[0066] Weigh 6.12g silica sol, dissolve in 20.06g deionized water and stir evenly to prepare silica sol dilute solution; 13.842g of 85% H 3 PO 4 Dissolve it in 16.57g of water, stir evenly, and then add it into the dilute silica sol solution to obtain a mixed solution of silicon and phosphorus. Weigh 9.90g of pseudo-boehmite, add 20.14g of deionized water, stir well for 1h, and add into the mixed solution of silicon and phosphorus. After mixing 18.18g of TEA (triethylamine) and 0.08g of NaF, they were added to the mixture containing Si source, P source, and Al source, and fully stirred. The molar composition of the resulting mixture is:

[0067] 3.0Et 3 N:0.6SiO2 2 :Al 2 o 3 :P 2 o 5 : 60H 2 O: 0.05NaF

[0068] Keep the above-mentioned composite template gel containing silicon, phosphorus...

Embodiment 2

[0073] The silicon source and phosphorus source are mixed first, and then the basic composite template formed by aluminum source, organic amine and fluoride is added in sequence.

[0074] Weigh 6.12g of silica sol, dissolve in 20.06g of water and stir evenly to prepare silica sol dilute solution; 13.842g of 85%H 3 PO 4 Dissolve it in 16.57g of water, stir evenly, and then add it into the dilute silica sol solution to obtain a mixed solution of silicon and phosphorus. Weigh 9.90g of pseudo-boehmite, add 20.14g of water, stir thoroughly for 1h, and add into the mixed solution of silicon and phosphorus. After mixing 18.18g of TEA (triethylamine) and 0.08g of NaF, they were added to the mixture containing Si source, P source, and Al source, and fully stirred. The molar composition of the resulting mixture is:

[0075] 3.0Et 3 N:0.6SiO2 2 :Al 2 o 3 :P 2 o 5 : 60H 2 O: 0.05NaF

[0076] Keep the gel of the composite template agent containing silicon, phosphorus, aluminum, ...

Embodiment 3

[0081] The silicon source and phosphorus source are mixed first, and then the basic composite template formed by aluminum source, organic amine and fluoride is added in sequence.

[0082] Weigh 6.12g of silica sol, dissolve in 20.06g of water and stir evenly to prepare silica sol dilute solution; 13.842g of 85%H 3 PO 4 Dissolve it in 16.57g of water, stir evenly, and then add it into the dilute silica sol solution to obtain a mixed solution of silicon and phosphorus. Weigh 9.90g of pseudo-boehmite, add 20.14g of water, stir thoroughly for 1h, and add into the mixed solution of silicon and phosphorus. After mixing 18.18g of TEA (triethylamine) and 0.08g of NaF, they were added to the mixture containing Si source, P source, and Al source, and fully stirred. The molar composition of the resulting mixture is:

[0083] 3.0Et 3 N:0.6SiO2 2 :Al 2 o 3 :P 2 o 5 : 60H 2 O: 0.05NaF

[0084] Keep the above-mentioned gel containing silicon, phosphorus, aluminum, and fluoride-con...

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Abstract

The invention discloses a method for preparing an SAPO-34 molecular sieve. The method comprises the following steps of: mixing a silicon source and a phosphorus source; sequentially adding aluminum source serous fluid and an organic amine template agent containing fluoride, and uniformly mixing; aging mixed gel prepared according to the charging sequence for a certain period of time, and raising the temperature to be between 120 and 150 DEG C at the speed of lower than 0.45 DEG C / min; keeping the temperature for a certain period of time, and raising the temperature to 200 DEG C at the speed of lower than 0.30 DEG C / min; performing hydrothermal crystallization at the temperature of 200 DEG C for 24 to 48 hours; controlling the acid strength and the acid density of the synthesized SAPO-34 molecular sieve, and controlling the particle size of the SAPO-34 molecular sieve to be between 2.5 and 3.0 micrometers; and crystallizing the synthesized serous fluid, centrifuging, filtering, washing, drying, roasting, and thus obtaining the SAPO-34 molecular sieve with high crystallinity, suitable acid strength, suitable acid density and a small particle size. The SAPO-34 molecular sieve is used for a reaction of preparing olefin through methanol or dimethyl ether and has high catalytic activity and high ethylene / propylene selectivity.

Description

technical field [0001] The invention relates to the field of molecular sieves, in particular to a preparation method of SAPO-34 molecular sieves, SAPO-34 molecular sieves obtained by the method and applications thereof. Background technique [0002] Ethylene and propylene are important basic raw materials in the modern chemical industry, with an annual demand of nearly 200 million tons worldwide. In the next few years, there will still be a large gap in domestic production of ethylene and propylene. The existing ethylene and propylene production technologies are heavily dependent on petroleum resources. As petroleum is a non-renewable resource with limited reserves and large fluctuations in petroleum prices, countries around the world have begun to devote themselves to the development of non-petroleum routes to ethylene and propylene-based low-carbon olefins in order to broaden raw material channels, adjust the structure of propylene raw materials, and reduce the impact on ...

Claims

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Application Information

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IPC IPC(8): C01B39/54C01B37/08B01J29/85C07C11/04C07C11/06C07C1/20
CPCY02P20/52Y02P30/20Y02P30/40
Inventor 邢爱华朱伟平岳国
Owner CHNA ENERGY INVESTMENT CORP LTD
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