Method for preparing high silica alumina ratio NaY molecular sieve

A technology with high silicon-aluminum ratio and molecular sieve, which is applied in the direction of crystalline aluminosilicate zeolite and octahedral crystalline aluminosilicate zeolite, etc., can solve the problems of low silicon utilization rate and difficult removal of cesium ions, shorten the crystallization time, The effect of good structural stability and catalytic activity

Active Publication Date: 2008-09-03
EAST CHINA UNIV OF SCI & TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this method, cesium ions are not easy to remove, and multiple exchanges and roasting are required [as described in USP 4714601], 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, and 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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  • Method for preparing high silica alumina ratio NaY molecular sieve
  • Method for preparing high silica alumina ratio NaY molecular sieve
  • Method for preparing high silica alumina ratio NaY molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take by weighing 209.31g sodium hydroxide solid (purity 99%) and be dissolved in 541.76g water, then add 35.53g aluminum hydroxide powder (purity 99%), be heated to boiling and stir reaction, reaction solution outward appearance is clear and transparent promptly reaction is finished, cooling After that, it is a high alkali sodium metaaluminate solution.

[0032]Weigh 97.78g of sodium hydroxide solid and dissolve it in water, then add 78.06g of aluminum hydroxide powder, heat to boiling and stir for reaction, the reaction solution is clear and transparent in appearance and the reaction is complete. After cooling, add deionized water to 500mL to obtain Low alkali sodium metaaluminate solution.

[0033] Take by weighing 235.30g aluminum sulfate solid (Al 2 (SO 4 ) 3 18H 2 O) In a beaker, add deionized water to dissolve, heat and stir until the solution is clear, and after cooling, add deionized water to 400mL to obtain aluminum sulfate solution.

[0034] Get 100mL wat...

Embodiment 2

[0041] In this example, the low alkalinity reaction gel is according to 2.70Na 2 O:Al 2 o 3 : 10.00 SiO 2 : 320H 2 The molar ratio of O is synthesized. Add 60mL of deionized water and 9.65g of directing agent to 69.21g of water glass solution, stir for 5-10 minutes, add 20.80g of aluminum sulfate solution, stir for 20-30 minutes, add 11.50g of low-alkali sodium metaaluminate solution , followed by vigorous stirring for 1 h.

[0042] In this example, the high alkalinity reaction gel is according to 5.50Na 2 O:Al 2 o 3 : 10.00 SiO 2 : 320H 2 The molar ratio of O is synthesized. Add 62mL of deionized water and 9.65g of directing agent to 69.21g of water glass solution, stir for 5-10 minutes, add 2.32g of aluminum sulfate solution, stir for another 20-30 minutes, add 27.31g of low-alkali sodium metaaluminate solution After the addition, stir vigorously for 1 hour, seal it in the beaker, raise the temperature to 100°C and keep it warm for 4 hours to crystallize, then add...

Embodiment 3

[0044] In this example, the low alkalinity reaction gel is according to 2.70Na 2 O:Al 2 o 3 : 11.90SiO2 2 : 320H 2 The molar ratio of O is synthesized. Add 60mL of deionized water and 9.65g of directing agent to 69.21g of water glass solution, stir for 5-10 minutes, add 20.80g of aluminum sulfate solution, stir for 2030 minutes, add 11.50g of low-alkali sodium metaaluminate solution, and finish adding Stir vigorously thereafter for 1 hour.

[0045] The preparation of the high alkalinity reaction gel in this example is the same as in Example 2. After the temperature is raised to and kept at 100°C for static crystallization for 4 hours, the low alkalinity reaction gel of this example is added and stirred evenly. In a stainless steel reaction kettle with a vinyl fluoride pad, the temperature was raised to and maintained at 100°C to continue static crystallization for 19 hours. The crystallinity of NaY molecular sieve measured by X-ray method is 92.4%, SiO 2 / Al 2 o 3 is ...

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Abstract

A preparation method of the NaY molecular sieve with high silica-alumina ratio includes: preparing the high alkalinity silica-alumina gel (3.0-6.0)Na2O:Al2O3:(7-20)SiO2:(100-600)H2O and the low alkalinity silica-alumina gel (0.5-3.0)Na2O:Al2O3:(7-20)SiO2:(100-600)H2O obtained by evenly mixing conventional directing agent, silicon source, aluminum source and water, heating up the high alkalinity silica-alumina gel to 90-110 DEG C, crystallizing for 0.5-20 hours, adding the low alkalinity silica-alumina gel, filtering, washing, drying and obtaining the NaY molecular sieve. The modified NaY molecular sieve is applicable to the catalyst preparation of catalytic cracking, hydrogen cracking and isomerization.

Description

technical field [0001] The invention relates to a preparation method of NaY molecular sieve with high silicon-aluminum ratio. Background technique [0002] Y-type molecular sieves are widely used in catalytic cracking, hydrocracking, isomerization and other oil refining processes as catalyst active components or catalyst supports. For NaY molecular sieves with similar grain size, their structural stability is mainly affected by two factors: crystallinity and skeleton silicon-aluminum ratio. In order to prepare FCC catalysts with good activity and product selectivity and high hydrothermal stability, molecular sieves should have high crystallinity and silicon-aluminum ratio. [0003] The silicon-aluminum ratio of Y-type molecular sieve (SiO 2 / Al 2 o 3 Molar ratio) has a direct relationship with the ratio of cracking / hydrogen transfer activity, increasing the ratio of silicon to aluminum in the skeleton, reasonably reducing the density of Al centers, increasing the relativ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/24C01B39/08
Inventor 陈辉许锋陆善祥欧阳丹霞王苏于冀勇
Owner EAST CHINA UNIV OF SCI & TECH
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