Small-grain high-Si Y-type molecular sieve and preparation method thereof

A molecular sieve and small-grain technology, applied in the direction of crystalline aluminosilicate zeolite, octahedral crystalline aluminosilicate zeolite, etc. Poor thermal stability and other problems, to achieve the effect of ensuring the continuity of the skeleton, good stability, and high crystallization retention

Active Publication Date: 2011-01-12
CHINA PETROLEUM & CHEM CORP +1
View PDF6 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN1382632A discloses a super-stabilizing method of small-grain Y-type zeolite, which is obtained by contacting the dry gas of silicon tetrachloride with small-grain NaY zeolite and washing it. Stability is just relatively poor, and this inventive method adopts the mode of vapor phase dealumination of silicon to process molecular sieve simultaneously, and this makes the thermal and hydrothermal stability of product worse, and activity is low; Small, high energy consumption and other disadvantages
Especially when the small-grain NaY zeolite (such as adopting the NaY zeolite synthesized by CN1081425A in the embodiment) with poor thermal stability and hydrothermal stability is modified, its crystallization retention is below 95%, due to the poor performance of raw materials , the stability of the silicon-aluminum framework structure in the molecular sieve is poor, and it is easy to cause...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Small-grain high-Si Y-type molecular sieve and preparation method thereof
  • Small-grain high-Si Y-type molecular sieve and preparation method thereof
  • Small-grain high-Si Y-type molecular sieve and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0030] The preparation method of small grain NaY type molecular sieve of the present invention specifically comprises the following steps:

[0031] A. Preparation of directing agent at low temperature.

[0032] According to Na 2 O:Al 2 o 3 : SiO 2 :H 2 O=10~20: 1: 10~20: 300~400 feed molar ratio, at a temperature above 0°C and less than 15°C, preferably at a temperature of 0°C to 10°C, the water glass is slowly stirred under the condition of stirring Add it into the high-alkaline sodium metaaluminate solution and mix evenly, then stir at the above temperature at a constant temperature and speed for 0.5-2 hours; then seal the mixed solution in a synthesis kettle, and age it at a static temperature for 10-14 hours to obtain a directing agent The directing agent is preferably added with 20% to 40% of the weight of the directing agent before use.

[0033] B. Preparation of gel at low temperature.

[0034] Mix water glass, aluminum sulfate solution, low-alkali sodium metaalu...

Embodiment 1

[0048] This example is to prepare NaY molecular sieve with small crystal grains as raw material.

[0049] The raw materials used are as follows:

[0050] High alkali sodium metaaluminate: Na 2 O content 291g / L, Al 2 o 3 Content 42g / L; low alkali sodium metaaluminate: Na 2 O content 117g / L, Al 2 o 3 Content 77g / L; water glass: SiO 2 Content 250g / L, modulus 3.2; aluminum sulfate: Al 2 o 3 Content 90g / L.

[0051] Preparation of LY-1:

[0052] A. Preparation of guiding agent: Slowly add 1200ml of water glass into 800ml of peralkaline sodium metaaluminate under stirring condition at 10°C. After adding the water glass, stir at constant temperature for 40 minutes. Stirring was stopped, and the mixed solution was sealed in a container, and aged at a temperature of 5°C for 12 hours at a constant temperature. After the constant temperature is finished, add 667ml of clean water to the mixed solution as a guiding agent.

[0053] B. Preparation of gel: Add 59.4ml of aluminum su...

Embodiment 2

[0060] Firstly, ammonium exchange is carried out on the raw material small-grain NaY molecular sieve LY-1. The preparation concentration is 10 liters of 0.5mol / 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 LNY-1.

[0061] Measure 1 liter of clean water and dissolve 1000 g of LNY-1 in the clean water, heat up and stir rapidly, the temperature is 95°C, and the stirring speed is 300 rpm. Within 2 hours, add ammonium hexafluorosilicate aqueous solution to the molecular sieve slurry at a uniform speed, add a total of 50 grams of ammonium hexafluorosilicate, then stir at a constan...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Specific surfaceaaaaaaaaaa
Pore volumeaaaaaaaaaa
Login to view more

Abstract

The invention discloses a small-grain high-Si Y-type molecular sieve and a preparation method thereof. The small-grain high-Si Y-type molecular sieve is a product prepared by using a small-grain NaY molecular sieve as a raw material and selecting proper modification processes, namely ammonia exchange, ammonium hexfluorosilicate for dealuminzation and silicon supplement, hydro-thermal treatment and aluminum salt aqueous solution treatment. The small-grain NaY molecular sieve used by the method can guarantee the skeleton continuity of the molecular sieve product, reduce the collapse possibilityof skeleton structure and maximally retain the integrity of Si-Al-O structure of the product during the subsequent medication treatments due to the high thermal and hydrothermal stabilities, high Si-Al ratio, high stability and uniform skeleton Si-Al structure; therefore, the product still has a crystalline retention degree as high as above 95 percent while having the greatly improved Si-Al ratio. The Y-type molecular sieve can be used as the active component for the hydrocracking catalysts to improve the activities of the catalysts, selectivity of the target product and the quality of the product.

Description

technical field [0001] The invention relates to a Y-type molecular sieve and a preparation method thereof, in particular to a small-grain Y-type molecular sieve 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, among which Y-type molecular sieves are most commonly used. At present, the methods for industrially producing Y-type molecular sieves basically adopt the directing agent method proposed by GRACE Company of the United States in USP 3639099 and USP 4166099. The crystal grains of the obtained common Y-type molecular sieves are generally about 1000nm, and the crystal grains are relatively large. The pores are relatively long, and the diffusion resistance is high. It is difficult for macromolecules to enter the pores for reaction, and it is also difficult for the products after the reaction to diffuse out. Therefore, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C01B39/24
Inventor 王凤来杜艳泽刘昶关明华
Owner CHINA PETROLEUM & CHEM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap