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NaY molecular sieve preparation method and NaY molecular sieve prepared by NaY molecular sieve preparation method

A molecular sieve and solution technology, which is applied in the directions of fajhedral crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problems of environmental pollution, complicated NaY molecular sieve process, increase NaY molecular sieve preparation time, etc., and achieve environmental friendliness. , shorten the production cycle, the effect of broad prospects for industrialization

Active Publication Date: 2020-02-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN1951812A discloses the use of organic bases or organic polymers as templates to directly synthesize high-silicon faujasite under the condition that the amount of sodium is less and no directing agent is used, but the subsequent demoulding process brought about by the use of organic templates still pollute the environment
The preparation of the directing agent often requires a certain amount of time and technology, which actually increases the preparation time of NaY molecular sieves.
Even if no directing agent is used, the purpose of promoting crystallization must be achieved by other means, which often complicates the process of preparing NaY molecular sieves

Method used

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preparation example Construction

[0036] According to one aspect of the present invention, it relates to a preparation method of NaY molecular sieve. The method comprises the steps of:

[0037] a) contacting the aluminum source with a sodium hydroxide solution to obtain a sodium aluminum solution;

[0038] b) contacting the silicon source with a sodium hydroxide solution to obtain a sodium-silicon solution;

[0039] c) contacting the sodium-aluminum solution with the sodium-silicon solution to obtain mixture I;

[0040] d) contacting the mixture I with an acidic aluminum source solution to obtain a gel;

[0041] e) crystallizing the gel to obtain the NaY molecular sieve.

[0042] According to one aspect of the present invention, in the sodium aluminum solution, the content of sodium oxide is not less than 20% by weight, preferably 20-30% by weight; the content of aluminum oxide is 4-8% by weight.

[0043] According to one aspect of the present invention, in step a), the contact conditions of the aluminum sou...

Embodiment 1

[0067] Feed molar ratio is Na 2 O: Al 2 o 3 :SiO2 2 :H 2 O=2.5:1:7.5:173. specific,

[0068] Preparation of sodium aluminum solution: Take 200g of water, add 41.9g of sodium metaaluminate, stir until completely dissolved. Then add 101.3g of sodium hydroxide and stir until completely dissolved to obtain a sodium-aluminum solution. The temperature of the solution was kept at 35°C during the preparation process. In the prepared sodium aluminum solution, the content of sodium oxide is 25%, and the content of aluminum oxide is 5%.

[0069] Take 84g of water, add 23.1g of sodium hydroxide, stir until completely dissolved, then add dropwise 107.1g of 40wt% silica sol, and stir for 0.5 hours to form a uniform solution. Then raise the temperature to 90°C and treat for 10 minutes to obtain a sodium-silicon solution. In the prepared sodium-silicon solution, the content of sodium oxide is 8%, and the content of silicon oxide is 20%.

[0070] Take 94.15g of sodium-silicon solutio...

Embodiment 2

[0076] Same as [Example 1], except that the silicon source is solid silica gel.

[0077] figure 1 The middle curve 2 is the XRD spectrum of the product. The spectrogram shows that it is a pure-phase NaY molecular sieve with a relative crystallinity of 91%.

[0078] image 3 A scanning electron microscope (SEM) photo of the product. Its average crystal grain diameter is 2000 nm.

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Abstract

The invention relates to a NaY molecular sieve preparation method and the NaY molecular sieve prepared by the preparation method. The method comprises: a) making an aluminum source contact a sodium hydroxide solution to obtain a sodium-aluminum solution; b) making a silicon source contact a sodium hydroxide solution to obtain a sodium-silicon solution; c) making the sodium-aluminum solution contact the sodium-silicon solution to obtain a mixture I; and d) making the mixture I contact an acidic aluminum source solution to obtain a gel; and e) crystallizing the gel to obtain the NaY molecular sieve. The method of the invention can be used in industrial production of NaY molecular sieves.

Description

technical field [0001] The invention relates to a preparation method of NaY molecular sieve and the prepared NaY molecular sieve. Background technique [0002] Y-type zeolite is the most widely used catalytic material in the current oil refining industry, and has always been a hot spot of concern and research by scientific researchers. In 1974, the U.S. GRACE company announced the patent US3639099, proposing to synthesize NaY molecular sieves by the directing agent method. The directing agent in this method is a mixture made of sodium silicate, sodium aluminate and water according to a certain molar ratio, and then silicon source and Aluminum source, crystallized at 100°C to prepare NaY molecular sieves. The invention and use of directing agent not only improves the silicon-aluminum ratio of NaY molecular sieve, but also reduces the synthesis cost of NaY molecular sieve, which can be said to be a milestone in the history of NaY molecular sieve synthesis. Therefore, at pres...

Claims

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Application Information

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IPC IPC(8): C01B39/24
CPCC01B39/24C01P2002/72C01P2004/03C01P2004/61
Inventor 杨为民王闻年高焕新
Owner CHINA PETROLEUM & CHEM CORP
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