Method for synthesizing fine grain NaY molecular sieve

A synthesis method and molecular sieve technology, applied in the direction of crystalline aluminosilicate zeolite, octahedral crystalline aluminosilicate zeolite, etc., can solve the problems of short diffusion path and poor accessibility of active centers, and achieve short crystallization time and crystal grain The effect of small particle size

Active Publication Date: 2009-07-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of internal diffusion, in many cases, it is difficult for the macromolecules in hydrocarbon oil to penetrate into the pores of large-grained molecular sieves, so the maximum accessibility of the active center is relatively poor, while small-grained molecular sieves have larger external areas and more The active center on the outer surface, and the diffusion path in the hole is short, and the utilization rate of the active site on the inner surface is improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Get 100ml water glass (Changling Oil Refinery Chemical Plant Catalyst Factory product, specific gravity 1.26, SiO 2 Content 250g / L, modulus 3.25) put into a beaker, add 202ml sodium metaaluminate solution (Changling Refinery Chemical Plant Catalyst Factory product, specific gravity 1.33, Al 2 o 3 Content 41g / L, Na 2 O content 296g / L) and 79.2g sodium hydroxide solid (purity > 96%), after mixing evenly, aged 72h at room temperature, obtains the desired directing agent, and its molar ratio is 25Na 2 O: Al 2 o 3 :5SiO2 2 :320H 2 O.

[0021] According to 2.76Na 2 O: Al 2 o 3 :8.4SiO2 2 :209H 2 The ratio of O to synthesize NaY molecular sieve. Under stirring, 230ml of deionized water, 85g of directing agent, 215ml of aluminum sulfate solution (product of Changling Refinery and Chemical Plant Catalyst Factory, specific gravity 1.28, Al 2 o 3 Content 90g / L) and 102ml low sodium metaaluminate solution (Changling Oil Refinery Chemical Plant Catalyst Factory product...

Embodiment 2

[0026] Get 100ml water glass (Changling Oil Refinery Chemical Plant Catalyst Factory product, specific gravity 1.26, SiO 2 Content 250g / L, modulus 3.25) put into a beaker, add 1012ml sodium metaaluminate solution (Changling Refinery Chemical Plant Catalyst Factory product, specific gravity 1.33, Al 2 o 3 Content 41g / L, Na 2 O content 296g / L), after mixing evenly, aged at room temperature for 72h, the desired directing agent was obtained, and its molar ratio was 12Na 2 O: Al 2 o 3 :1SiO2 2 :150H 2 O.

[0027] According to 2.76Na 2 O: Al 2 o 3 :8.4SiO2 2 :209H 2 The proportioning of O, under stirring, successively mix 280ml deionized water, 68g directing agent, 215ml aluminum sulfate solution (Changling Oil Refinery Chemical Plant Catalyst Factory product, specific gravity 1.28, Al 2 o 3 Content 90g / L) and 166ml low sodium metaaluminate solution (Changling Oil Refinery Chemical Plant Catalyst Factory product, specific gravity 1.27, Al 2 o 3 Content 102g / L, Na 2 O...

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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 and crystallizing. The method is characterized in that the mol composition of the director reagent is (10-30)Na2O:Al2O3:(0.1-8) SiO2:(150-380)H2O. The method can synthesize the small crystal grain NaY molecular sieve with the grain diameter of between 150 and 350nm.

Description

technical field [0001] The invention relates to a method for synthesizing NaY molecular sieves. Background technique [0002] Y-type molecular sieves commonly used in catalytic cracking catalysts are usually prepared by modifying NaY molecular sieves by various methods. At present, most of the methods for industrially producing NaY molecular sieves adopt the directing agent method proposed by Grace Company of the United States in US3639099 and US3671191. The method is first to prepare the molar composition as (15-17)Na 2 O: Al 2 o 3 :(14-16)SiO2 2 :(285-357)H 2 The directing agent of O, the crystal nucleus particle size of the directing agent is usually less than 0.05 microns, and then the directing agent is mixed with 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)SiO2 2 :(120-200)H 2 The ratio of O was mixed to prepare a crystallization reaction mixture, and then the mixture wa...

Claims

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Application Information

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