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Nay molecular sieve and preparation method thereof

A molecular sieve and solution technology, which is applied in the directions of crystalline aluminosilicate zeolite and octahedral crystalline aluminosilicate zeolite, can solve the problems of difficult filtration, easy agglomeration and large particle size.

Active Publication Date: 2019-06-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently synthesized NaY molecular sieves, due to their small particle size, are easy to agglomerate during the synthesis process, are difficult to filter, have large particle size, and poor dispersion, making it difficult to exert their advantages in industrial applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Synthesis of a Highly Dispersed NaY Molecular Sieve

[0048] (1) Preparation of guiding agent: Take 28.4g sodium hydroxide (Beijing Chemical Plant, industrial grade) and add it to 66.9g water, stir until the sodium hydroxide is completely dissolved, then add 4.7g sodium metaaluminate (Beijing Chemical Plant, industrial grade) grade), continue to stir until the sodium metaaluminate is completely dissolved to obtain sodium metaaluminate solution A (Al 2 o 3 The content is 22wt.%, Na 2 O content is 3 wt.%). Get the water glass of the solution A of 38.2g and 82g (Beijing Red Star Soda Soda Factory, SiO 2 Content 27.81wt.%, Na 2 O content 8.74wt.%) were mixed and stirred evenly, after stirring for 2 hours, aged at 20°C for 72 hours. Based on 100wt.% of the directing agent, the molar ratio of each component is: 19Na 2 O: Al 2 o 3 :34SiO 2 :550H 2 O.

[0049] (2) Preparation of NaY molecular sieve: Dissolve 75.5g of aluminum sulfate in 124.5g of water to form Al 2 ...

Embodiment 2

[0053] Unless otherwise specified, the source of each raw material is the same as in Example 1.

[0054] (1) Preparation of guiding agent: Take 38.7g of sodium hydroxide and add it to 33.2g of water, stir until the sodium hydroxide is completely dissolved, then add 17.3g of sodium metaaluminate, and continue stirring until the sodium metaaluminate is completely dissolved to obtain metaaluminum Sodium acid solution A (Al 2 o 3 The content is 11wt.%, Na 2 O content is 30 wt.%). Take 12g of solution A and 56g of water glass, mix and stir evenly, add 14.9g of sodium hydroxide and 39g of water, stir for 2h, then age at 50°C for 0.5h. Based on 100wt.% of the directing agent, the molar ratio of each component is: 25Na 2 O: Al 2 o 3 :20SiO2 2 :350H 2 O.

[0055] (2) Preparation of NaY molecular sieve: Dissolve 37.7g of aluminum sulfate in 162.3g of water to form Al 2 o 3 Content is 3wt.% aluminum sulfate solution B; Dissolve 46.5g sodium hydroxide in 122.1g water, add 31.5g...

Embodiment 3

[0059] Unless otherwise specified, the source of each raw material is the same as in Example 1.

[0060] (1) Preparation of guiding agent: Take 25.8g of sodium hydroxide and add it to 64.8g of water, stir until the sodium hydroxide is completely dissolved, then add 9.4g of sodium metaaluminate, and continue stirring until the sodium metaaluminate is completely dissolved to obtain metaaluminum Sodium acid solution A (Al 2 o 3 The content is 6wt.%, Na 2 O content is 20 wt.%). Take 22g of solution A and 45g of water glass, mix and stir evenly, add 7g of sodium hydroxide and 14g of water, stir for 2h, then age at 30°C for 36h. Based on 100wt.% of the directing agent, the molar ratio of each component is: 25Na 2 O: Al 2 o 3 :16SiO2 2 :220H 2 O.

[0061] (2) Preparation of NaY molecular sieve: Dissolve 37.7g of aluminum sulfate in 62.3g of water to form Al 2 o 3 Content is the aluminum sulfate solution B of 6wt.%; Dissolve 19.4g sodium hydroxide in 7.9g water, add 72.8g s...

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Abstract

The invention provides a NaY molecular sieve and a preparation method thereof. The preparation method comprises the following steps: firstly synthesizing a guiding agent, then preparing a mixture for synthesis of the NaY molecular sieve, and finally adding a surfactant into the mixture and synthesizing the NaY molecular sieve with average particle size of 100-1000 nm by a hydrothermal crystallization method. The molecular sieve has high dispersity.

Description

technical field [0001] The invention relates to a NaY molecular sieve and a preparation method thereof, in particular to a highly dispersed NaY molecular sieve with a large specific surface area, a short and regular pore structure and a high intracrystalline diffusion rate and a preparation method thereof. Background technique [0002] The particle size of nano-molecular sieves is between 1 and 100nm, and some of its physical and chemical properties, such as wear resistance, strength, thermal stability and catalytic activity, are significantly higher than those of conventional molecular sieves. [0003] One is to have a larger external surface area. The pore surface area of ​​molecular sieves is composed of pore walls and cage walls formed by micropore channels. The particle size of conventional molecular sieves is generally above 1 μm, and its external specific surface area accounts for a very low proportion of the total specific surface area. Therefore, The active sites o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/24
Inventor 刘百军尹延超庞新梅黄晓卉王更更崔岩刘莎莎沈宜泓邢昕
Owner PETROCHINA CO LTD