Synthesis method of NaY molecular sieve

A synthesis method and molecular sieve technology, which can be applied in directions such as fajhedral crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problems of prolonging crystallization time and the like

Active Publication Date: 2005-06-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

GB 2131597 discloses a method for preparing Y-type molecular sieves with a silicon-aluminum ratio of 5.3-6 by reducing the alkalinity of the synthetic gel, but this method significantly prolongs the crystallization time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Get 100ml water glass (Changling Oil Refinery Chemical Plant Catalyst Factory product, specific gravity 1.26, SiO 2content 255.8g / L, modulus 3.24) into a beaker, add 70.7g high sodium metaaluminate solution (product of Changling Oil Refinery Catalyst Factory, specific gravity 1.33, Al 2 o 3 Content 41g / L, Na 2 O content 280g / L), after mixing evenly, aged at room temperature for 24h, the desired directing agent was obtained, and its molar ratio was 16Na 2 O:Al 2 o 3 : 15SiO 2 : 320H 2 O.

[0027] NaY molecular sieve according to 2.76Na 2 O:Al 2 o 3 : 8.4SiO2 2 :209H 2 O ratio synthesis. Under stirring, 189ml of deionized water, 86.6g of directing agent, 130ml of aluminum sulfate solution (product of Changling Refinery and Chemical Plant Catalyst Factory, specific gravity 1.28, Al 2 o 3 Content 88.2g / L) and 100ml low sodium metaaluminate solution (Changling Oil Refinery Chemical Plant Catalyst Factory product, specific gravity 1.23, Al 2 o 3 Content 102g / L...

Embodiment 2

[0031] NaY molecular sieve synthetic gel 1000g prepared in example 1, after static crystallization at 100°C for 20h, add 6.4g sodium hydrogen phosphate to continue crystallization for 17h, the crystallinity of NaY molecular sieve measured by X-ray diffraction method is 91.7%, SiO 2 / Al 2 o 3 is 5.56.

Embodiment 3

[0033] NaY molecular sieve synthesis gel 1000g prepared in example 1, after static crystallization at 100°C for 1h, add 4g oxalic acid to continue crystallization for 37h, the crystallinity of NaY molecular sieve measured by X-ray diffraction method is 96.0%, SiO 2 / Al 2 o 3 is 5.61.

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PUM

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Abstract

The process of synthesizing NaY molecular sieve includes the following steps: synthesizing guide agent; mixing the guide agent, water glass, acid aluminum salt and sodium aluminate to obtain gel; crystallizing the gel; and filtering, washing and drying. The preparation process features the step of crystallizing the gel, and the step includes first crystallization at 80-120 deg.c for 0.1-70 hr and subsequent addition of one kind of acid matter in the amount of molar ratio to Al2O3 in the gel in 0.01-3 before further crystallization.

Description

technical field [0001] The invention relates to a synthesis method of NaY molecular sieve. Background technique [0002] Y-type molecular sieve with faujasite crystal structure is the main raw material for preparing catalytic cracking catalyst. At present, the methods for producing NaY molecular sieves in industry basically adopt the directing agent method proposed in USP3,639,099 and USP 3,671,191 by Grace Company of the United States. The method is to prepare the composition of (15 ~ 17) Na 2 O:Al 2 o 3 :(14~16)SiO 2 :(285~357)H 2 O, a directing agent whose crystal nucleus particle size is generally less than 0.05 microns, and then mixed with water glass, sodium aluminate, aluminum sulfate, etc. to prepare a composition of (3-6) Na 2 O:Al 2 o 3 :(8~12)SiO 2 :(120~200)H 2 O, and then crystallize this mixture at around 100°C. Since then, the methods for synthesizing NaY molecular sieves without templates proposed by people are similar to the above-mentioned method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04C01B39/24
Inventor 刘中清舒兴田李明罡崇奇罗一斌宗保宁慕旭宏何鸣元
Owner CHINA PETROLEUM & CHEM CORP
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