Method for synthesizing NaY molecular sieve

A synthesis method and molecular sieve technology, applied in the direction of octahedral crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problems of reducing catalyst stability and achieve the effect of short crystallization time

Active Publication Date: 2011-05-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] During the use of FCC catalysts, the hydrothermal environment of the regenerator will dealuminate the framework of the Y-type molecular sieve, reducing the stability of the catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Get 100ml water glass (Changling Oil Refinery Chemical Plant Catalyst Factory product, specific gravity 1.26, SiO 2 content 250g / L, modulus 3.25) into a beaker, add 67ml high alkali sodium metaaluminate solution (product of Changling Oil Refinery and Chemical Plant Catalyst Factory, specific gravity 1.35, Al 2 o 3 Content 42g / L, Na 2 O content 296g / L), mix evenly, and age at room temperature for 24 hours to obtain the directing agent, and its molar ratio is 16Na 2 O:Al 2 o 3 : 15SiO 2 : 320H 2 O.

[0026] According to 2.76Na 2 O:Al 2 o 3 : 8.4SiO2 2 :209H 2 Proportioning of O, under stirring, add 170ml deionized water, 88g directing agent, 130ml aluminum sulfate solution (product of Changling Refinery and Chemical Plant Catalyst Factory, specific gravity 1.28, Al 2 o 3 Content 90g / L) and 100ml low-alkali sodium metaaluminate solution (Changling Refinery Chemical Plant Catalyst Plant product, specific gravity 1.26, Al 2 o 3 Content 102g / L, Na 2 O content ...

Embodiment 2

[0030] Prepare NaY molecular sieve synthetic gel according to the method of Example 1, wherein after adding low-alkali sodium metaaluminate, add 10g polyvinyl alcohol (Sinopharm Chemical Reagent Co., Ltd., model: 1750 series, degree of hydrolysis: 60%, molecular weight is 77000 , the purity is 99%), vigorously stirred for 30 minutes, and stood for crystallization at 100°C for 22h. The weight ratio of polyvinyl alcohol to aluminum oxide in the gel was 0.43:1, then filtered, washed, and dried to obtain NaY molecular sieves. The crystallinity of NaY molecular sieve measured by X-ray diffraction method is 95.7%, SiO 2 / Al 2 o 3 (Molar ratio) was 5.8.

Embodiment 3

[0032] Get 100ml water glass (Changling Oil Refinery Chemical Plant Catalyst Factory product, specific gravity 1.26, SiO 2 content 250g / L, modulus 3.25) into a beaker, add 67ml high alkali sodium metaaluminate solution (product of Changling Oil Refinery and Chemical Plant Catalyst Factory, specific gravity 1.35, Al 2 o 3 Content 42g / L, Na 2 O content 296g / L), after mixing evenly, aging at room temperature for 24 hours, the directing agent is obtained, and its molar ratio is 16Na 2 O:Al 2 o 3 : 15SiO 2 : 320H 2 O.

[0033] According to 2.76Na 2 O:Al 2 o 3 : 8.4SiO2 2 :209H 2 Proportioning of O, under stirring, add 170ml deionized water, 88g guiding agent, 130ml aluminum sulfate solution (product of Changling Refinery Chemical Plant Catalyst Factory, specific gravity 1.28, Al 2 o 3 Content 90g / L) and 100ml low-alkali sodium metaaluminate solution (Changling Refinery Chemical Plant Catalyst Plant product, specific gravity 1.26, Al 2 o 3 Content 102g / L, Na 2 O cont...

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PUM

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Abstract

The invention relates to a method for synthesizing a NaY molecular sieve, which comprises the steps of synthesizing director reagents, synthesizing gel, crystallizing and reclaiming. The method is characterized in that an additive is introduced in the process of synthesizing the gel or crystallizing, wherein the weight ratio of the additive to Al2O3 in the gel is 0.1-3:1, and the additive selects from one or more of ethanol with ester or hydrolyzing degree not more than 70 percent. The method does not need to change the prior flow and equipment for synthesizing the NaY molecular sieve, has shorter crystallizing time, can synthesize the NaY molecular sieve with silicon-aluminum ratio more than 5.5.

Description

technical field [0001] The invention relates to a method for synthesizing NaY molecular sieves. Background technique [0002] Y-type molecular sieves are commonly used active components of FCC catalysts, and are usually prepared by modifying NaY molecular sieves. At present, the method for industrially producing NaY molecular sieves mostly adopts the directing agent method proposed by U.S. Grace Company in US3639099 and US3671191. The method first prepares the molar composition as (15-17) Na 2 O:Al 2 o 3 :(14-16)SiO 2 :(285-357)H 2 The directing agent of O, and then directing agent and water glass, sodium metaaluminate, aluminum sulfate and other raw materials according to the molar ratio (3-6)Na 2 O:Al 2 o 3 : (8-12)SiO 2 :(120-200)H 2 The proportion of O is mixed to prepare the gel, and then the gel is crystallized at about 100 °C. The silicon-aluminum ratio of the NaY molecular sieve synthesized by this method is usually about 5.0, genera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/24
Inventor 赵元生刘中清何鸣元
Owner CHINA PETROLEUM & CHEM CORP
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