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A kind of Y-type molecular sieve and preparation method thereof

A molecular sieve and property technology, which is applied in the directions of octahedral crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problems of reducing catalyst selectivity and affecting the diffusion of reactants, and achieves good hydrothermal stability and framework structure. The effect of uniform and optimal pore size distribution

Active Publication Date: 2018-08-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But for large-grained molecular sieves, the larger the particle size, the longer the pores, which not only affects the diffusion of reactants, but also the reactants are prone to multiple cracking reactions in the pores of molecular sieves, reducing the selectivity of the catalyst.

Method used

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  • A kind of Y-type molecular sieve and preparation method thereof
  • A kind of Y-type molecular sieve and preparation method thereof
  • A kind of Y-type molecular sieve and preparation method thereof

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preparation example Construction

[0042] In the preparation method of the large-crystalline NaY-type molecular sieve of the present invention, the Na 2 O content is 260~320g / L, Al 2 O 3 The content is 30~50g / L and can be prepared by conventional methods. Na in low alkali sodium metaaluminate solution 2 O content is 100~130g / L, Al 2 O 3 The content is 60~90g / L and can be prepared by conventional methods. Al in aluminum sulfate solution 2 O 3 The content is 80~100g / L. SiO in water glass 2 The content is 200~300g / L, and the modulus is 2.8~3.5.

[0043] The preparation method of the large-crystalline NaY molecular sieve of the present invention specifically includes the following steps:

[0044] I. According to Na 2 O: Al 2 O 3 : SiO 2 : H 2 O=10~15:1:10~20:500~600 molar ratio of feed, at a temperature of 20℃~40℃, preferably at a temperature of 25~35℃, slowly add the water glass to the Mix evenly in the high-alkali sodium metaaluminate solution, then add aluminum sulfate solution and low-alkali sodium metaaluminate s...

Embodiment 1

[0059] In this embodiment, the method of the present invention is used to prepare large-crystalline NaY molecular sieves.

[0060] Preparation of LY-1

[0061] (1) Preparation of gel: Under stirring conditions at a temperature of 25℃, slowly add 165mL water glass to 63mL of high-alkali sodium metaaluminate solution. After mixing well, add 42.5mL aluminum sulfate solution and 35.6mL low The alkali sodium metaaluminate solution is stirred at a constant temperature for 0.5 hours, and then the obtained synthetic solution is statically aged at the above temperature for 1 hour to obtain a gel;

[0062] (2) Crystallization: Under stirring conditions, raise the gel in the synthesis kettle to 100°C at a heating rate of 2.5°C / min, stir and crystallize at constant temperature for 16 hours, after the crystallization is completed, quickly cool down with cold water and open The synthesized molecular sieve is taken out from the synthesis kettle, filtered, washed and dried to obtain the product LY-...

Embodiment 2

[0077] Firstly, the raw material large-grain NaY molecular sieve LY-1 is ammonium exchanged. The preparation concentration is 10 liters of 0.5mol / L ammonium nitrate aqueous solution. Weigh 2000 grams of small-crystalline NaY molecular sieve and dissolve it in 10 liters of prepared ammonium nitrate aqueous solution, stirring at 300 rpm, and stirring at a constant temperature of 90°C for 1 hour, then filter the molecular sieve and save a sample for analysis of Na 2 O content; repeat the above operation until Na in the molecular sieve 2 The O content reaches 2.5-5wt%, and the dried sample number is LYN-1.

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Abstract

The invention discloses a Y type molecular sieve and a preparation method thereof. The Y type molecular sieve has the following properties that: the average grain diameter is 2.0-5.0micrometers, the relative crystallinity is 110%-150%, the molar ratio of SiO2 / Al2O3 is 10-50, the unit cell parameter is 2.436-2.450nm, and the pore volume of holes with a hole diameter of 2nm-6nm accounts for 60%-90% of a total pore volume. The large-grained Y type molecular sieve has the characteristics of large grain, high crystallization degree and more concentrated effective pore size distribution, also has good thermal stability and hydrothermal stability, and is especially suitable to serve as the cracking component of a hydrocracking catalyst.

Description

Technical field [0001] The invention relates to a Y-type molecular sieve and a preparation method thereof, in particular to a Y-type molecular sieve with large crystal grains, high crystallinity and more concentrated pore size distribution and a preparation method thereof. Background technique [0002] At present, molecular sieves that can be used as cracking active components in the field of heavy oil cracking include Y-type, β-type and ZSM-type molecular sieves, among which Y-type molecular sieves are the most commonly used. At present, the methods of industrial production of Y-type molecular sieves basically adopt the directing agent method proposed by GRACE in USP 3639099 and USP 4166099. The crystal grains of ordinary Y-type molecular sieves are generally about 1 μm, and each dimension is about There are 300 to 400 unit cells. For conventionally synthesized Y-type molecular sieve with ordinary grain size, the pore distribution ratio of the original powder pore diameter less...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/24
Inventor 刘昶王凤来杜艳泽黄薇赵红关明华
Owner CHINA PETROLEUM & CHEM CORP