Preparation method of NaY molecular sieve

A molecular sieve and al2o3 technology, which is applied in the directions of fajhedral crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve problems such as prolonging crystallization time

Active Publication Date: 2005-06-01
CHINA PETROLEUM & CHEM CORP +1
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  • 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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Get 100ml water glass (Changling Oil Refinery Chemical Plant Catalyst Factory product, specific gravity 1.26, SiO 2 content 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.

[0028] 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 / ...

Embodiment 2

[0034] The NaY molecular sieve synthetic gel prepared in Example 1 was statically crystallized at 100° C. for 10 hours, and then 78 ml of water glass (same specification as above) was added to continue crystallization for 17 hours. The crystallinity of the NaY molecular sieve was 97% as measured by X-ray diffraction. SiO 2 / Al 2 o 3 is 5.92.

Embodiment 3

[0036] The NaY molecular sieve synthetic gel prepared in Example 1 was statically crystallized at 100° C. for 1 hour, and then 100 ml of water glass (same specification as above) was added to continue the crystallization for 17 hours. The crystallinity of the NaY molecular sieve was 97% as measured by X-ray diffraction. SiO 2 / Al 2 o 3 is 6.34.

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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 silicon-containing matter in the amount of molar ratio between SiO2 and the Al2O3 in the gel in 0.1-10 before further crystallization for 1-50 hr. The said preparation process has shortened crystallization time and increased Si/Al ratio in the NaY molecular sieve product.

Description

technical field [0001] The invention relates to a preparation 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 meth...

Claims

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Application Information

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IPC IPC(8): C01B39/04C01B39/24
Inventor 刘中清何鸣元李明罡崇奇罗一斌宗保宁慕旭宏舒兴田
Owner CHINA PETROLEUM & CHEM CORP
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