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Modified Y type molecular sieve as well as preparation method and application thereof

A molecular sieve and modification technology, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of complex preparation process, increased preparation cost, and high price, and achieve control of cracking degree and thermal stability And the effect of good hydrothermal stability and low cost

Active Publication Date: 2017-11-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses expensive surfactants to prepare Y-type molecular sieves, and the preparation process is complicated, which greatly increases the preparation cost

Method used

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  • Modified Y type molecular sieve as well as preparation method and application thereof
  • Modified Y type molecular sieve as well as preparation method and application thereof
  • Modified Y type molecular sieve as well as preparation method and application thereof

Examples

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preparation example Construction

[0046] In the preparation method of the large-grain NaY type molecular sieve of the present invention, in the high alkali sodium metaaluminate solution, Na 2 O content is 260~320g / L, Al 2 o 3 The content is 30~50g / L, and it 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 it 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.

[0047] The preparation method of large grain NaY type molecular sieve of the present invention specifically comprises the following steps:

[0048] I. According to Na 2 O: Al 2 o 3 : SiO 2 :H 2 O=10~15:1:10~20:500~600 molar ratio, at 20°C~40°C, preferably 25~35°C, slowly add water glass to the Mix evenly in high-alkali sodium metaaluminate solution, then add aluminum sulfate solution and low-alkali sodium met...

Embodiment 1

[0064] In this example, large-grain NaY molecular sieves were prepared by the method of the present invention.

[0065] Preparation of LY-1

[0066] (1) Preparation of gel: Slowly add 165mL of water glass to 63mL of high alkali sodium metaaluminate solution under stirring condition at a temperature of 25°C. After mixing evenly, add 42.5mL of aluminum sulfate solution and 35.6mL of low Alkaline sodium metaaluminate solution, stirred at constant temperature for 0.5 hours, and then aging the obtained synthetic solution at the above temperature for 1 hour to obtain a gel;

[0067] (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 a constant temperature for 16 hours, after the crystallization is completed, quickly cool down with cold water, and open the The synthesized molecular sieve was taken out from the synthesis kettle, and the product LY-1 was obtained after filtering, washin...

Embodiment 2

[0082] Firstly, ammonium exchange is carried out on the raw material large-grain NaY molecular sieve LY-1. Prepare 10 liters of 0.5 mol / L ammonium nitrate aqueous solution. Weigh 2,000 grams of small-grain NaY molecular sieves, dissolve them in 10 liters of prepared ammonium nitrate aqueous solution, stir at 90°C for 1 hour at a constant temperature of 300 rpm, then filter the molecular sieves, and leave a small sample to analyze Na 2 O content; repeat the above operation until Na in the molecular sieve 2 The O content reaches 2.5-5wt%, and the sample number obtained after drying is LYN-1.

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Abstract

The invention discloses a modified Y type molecular sieve as well as a preparation method and application thereof. The Y type molecular sieve has the following properties: the crystal particle average diameter is 2.0 to 5.0 mu m, the relative crystallinity is 100 percent to 140 percent, the molar ratio of SiO2 / Al2O3 is 30 to 100 and is preferably 40 to 100, the crystal cell parameter is 2.428 to 2.445nm, and the pore volume of a hole with the hole diameter being 2nm to 8nm accounts for 80 percent to 95 percent, preferably 80 percent to 90 percent of the total pore volume. The total acid content of NH3-TPD is 0.2 to 1.0mmol / g, wherein, the strong acid accounts for 75 percent or more of the total acid amount at the temperature larger than 250 DEG C, the pore volume of the Y type molecular sieve is 0.55cm<3> / g to 0.70cm<3> / g, and the specific surface area is 700m<2> / g to 1000m<2> / g. The molecular sieve has the advantages of large crystal particle, high crystalline, high silicon, more concentrated effective hole diameter distribution, favorable heat stability and hydrothermal stability and the like, and is suitable to be used for preparing a hydrogenation catalyst.

Description

technical field [0001] The invention relates to a modified Y-type molecular sieve and its preparation method and application, in particular to a Y-type molecular sieve with large crystal grains, high crystallinity, high silicon and more concentrated pore size distribution, its preparation method and application. Background technique [0002] In the field of hydrocracking of distillate oil, molecular sieves that can be used as active components of cracking catalysts include Y-type, β-type and ZSM-type molecular sieves, among which Y-type molecular sieves are most commonly used. The method of industrial production of Y-type molecular sieve basically adopts the directing agent method proposed by GRACE Company of the United States in USP 3639099 and USP 4166099. The crystal grains of the obtained ordinary Y-type molecular sieve are generally about 1 μm, and there are about 1 μm in each dimension. 300~400 unit cells. Conventionally synthesized Y-type molecular sieve raw powder w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/24B01J29/16
CPCB01J29/166B01J2229/18C01B39/24C01P2002/72C01P2004/03C01P2006/17C01P2006/32C01P2006/90
Inventor 刘昶曹均丰郝文月廖杰锋杜艳泽黄薇王凤来关明华
Owner CHINA PETROLEUM & CHEM CORP
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