High silicon aluminium ratio small crystal NaY molecular sieve

A high-silicon-aluminum ratio, molecular sieve technology, applied in crystalline aluminosilicate zeolite, octahedral crystalline aluminosilicate zeolite, etc., can solve the problems of difficult removal of cesium ions, low silicon utilization rate, etc., and achieve good structural stability and stability. Catalytic activity, low cost of raw materials, and effect of reducing manufacturing costs

Active Publication Date: 2006-06-14
PETROCHINA CO LTD +1
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the cesium ions in the product of this method are not easy to remove, and multiple exchanges and roasting are required [as described in USP4714601], and the seed crystal must be prepared by a specific method
In addition, the silicon-aluminum ratio of raw materials is required to be as high as 65-135 when feeding, but the utilization rate of silicon is low, and a large amount of high-concentration silicon waste liquid is discharged

Method used

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  • High silicon aluminium ratio small crystal NaY molecular sieve
  • High silicon aluminium ratio small crystal NaY molecular sieve
  • High silicon aluminium ratio small crystal NaY molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Take 10.53g of sodium hydroxide solid (produced by Beijing Chemical Plant, with a purity of 99%) and dissolve it in 30.95g of water. After cooling to room temperature, add 2.22g of sodium metaaluminate (produced by Tianjin Jinke Fine Chemical Research Institute, Al 2 O 3 The content is 45wt%, Na 2 The O content is 41wt%) to prepare a high-alkali sodium metaaluminate solution. Then add 36.73g water glass (produced by Beijing Red Star Sodium Alkaline Plant, SiO 2 The content is 28.83wt%, Na 2 The content of O is 8.84wt%), and the directing agent is prepared by stirring and aging at 40°C for 4 hours after uniform mixing.

[0060] Place 14.21g of water in the beaker, control the liquid temperature in the beaker to 60°C, and add 12.79g of 50wt% Al at the same time under rapid stirring 2 (SO 4 ) 3 (Produced by Nanzhao Huaxin Chemical Co., Ltd., purity 99%) solution and 31.91g water glass. After stirring uniformly, add 1.90g of the above-mentioned directing agent, the pH of the ge...

Embodiment 2

[0067] The source of each raw material and the preparation of the directing agent are the same as in Example 1.

[0068] The beaker containing 13.47g of water was kept at a constant temperature of 50°C, and 12.66g of 50wt% Al was added at the same time under rapid stirring. 2 (SO 4 ) 3 After stirring the solution and 31.55g of water glass evenly, 4.40g of the above-mentioned directing agent was added, and the pH of the gel was 12.8. In the above process, the material in the beaker is always kept at 50°C. After stirring uniformly, put it into a stainless steel reactor, shake and crystallize at 60°C for 4 hours, then heat up to 100°C for static crystallization for 36 hours, then filter, wash and dry to obtain NaY molecular sieve product.

[0069] XRD measured the ratio of silicon to aluminum of the NaY molecular sieve product was 6.2, the relative crystallinity was 98%, the average grain size was 488 nanometers, and the BET specific surface area was 750m. 2 / g.

Embodiment 3

[0071] The source of each raw material and the preparation of the directing agent are the same as in Example 1.

[0072] The constant temperature of the beaker containing 14.21g of water was 60℃, and 12.79g of 50wt% Al was added at the same time under rapid stirring. 2 (SO 4 ) 3 After stirring the solution and 31.91g of water glass, add 4.31g of the above-mentioned directing agent, and the pH of the gel is 12.8. During the above process, the material in the beaker is always kept at 60°C. After stirring uniformly, put it into a stainless steel reactor, stir and crystallize at 60°C for 4 hours, then heat to 100°C for static crystallization for 36 hours, then filter, wash and dry to obtain NaY molecular sieve product.

[0073] XRD measured the ratio of silicon to aluminum of the NaY molecular sieve product was 6.3, the relative crystallinity was 98%, the average grain size was 510 nanometers, and the BET specific surface area was 743m. 2 / g.

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Abstract

The present invention provides a high silica-alumina ratio small crystal grain NaY molecular sieve. The skeleton silica-alumina ratio of NaY molecular sieve, namely. SiO2/Al2O3 mole ratio is 6.0-7.0, and the average grain size is 300-800 nm. It can be made up by adopting non-template agent direct synthesis process. Its preparation method includes the following steps: firstly, stirring and ageing for 0.5-48 hr at 15-60deg.C to obtain crystallization guide agent, then mixing said guide agent, water, silicon source and aluminium source to obtain reaction mixture, then crystallizing said mixture at twice, first steps is dynamic crystallization and second step is static crystallization, finally, filtering, washing and drying so as to obtain the invented high silica-alumina ratio small crystal grain NaY molecular sieve whose relative crystallinity is greater than 80%.

Description

Technical field [0001] The invention relates to a NaY molecular sieve with high silicon-to-aluminum ratio and small crystal grains, in particular to a directly synthesized NaY molecular sieve with high silicon-to-aluminum ratio and small crystal grains. Background technique [0002] Y-type molecular sieves are widely used in oil refining processes such as catalytic cracking, hydrocracking and isomerization as catalyst active components or catalyst carriers. The Y-type molecular sieve synthesized by conventional methods generally has a grain size of about 1000 nm. The Y-type molecular sieve with small grain size, due to its larger external surface area and higher intra-crystalline diffusion rate, is better than conventional grains in terms of improving the ability to transform macromolecules, reducing secondary cracking of products, and reducing catalyst coking. The size of the Y-type molecular sieve has more superior performance, but for FCC catalysts, because the use and regener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02C01B39/24
Inventor 申宝剑高雄厚曾鹏晖王宝杰王玉超刘宏海庞新梅秦松郭金涛郭巧霞郑俊鹤龚朝兵张莉何金龙段长艳赵连鸿
Owner PETROCHINA CO LTD
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