A method for preparing the small crystal grain NaY molecular screen

A molecular sieve and small-grain technology, which is applied in the directions of crystalline aluminosilicate zeolite, fajhedral crystalline aluminosilicate zeolite, etc., can solve the problems of easy volatilization, environmental pollution, low framework silicon and aluminum, etc., and achieves low cost and simple operation. Convenient, flexible modulation effects

Active Publication Date: 2010-05-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the majority of molecular sieves synthesized by adding organic solvents or sugars have relatively low silicon-alumina frameworks, and organic solvents are easy to volatilize under hydrothermal crystallization conditions, which will cause varying degrees of pollution to the environment.

Method used

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  • A method for preparing the small crystal grain NaY molecular screen
  • A method for preparing the small crystal grain NaY molecular screen
  • A method for preparing the small crystal grain NaY molecular screen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Directing agent preparation: get 100ml water glass (Changling Refinery Chemical Plant Catalyst Factory product, specific gravity 1.26, SiO 2 content 250g / L, modulus 3.25) into a beaker, add 54ml sodium metaaluminate solution (Changling Refinery Chemical Plant catalyst factory product, specific gravity 1.33, Al 2 o 3 Content 41g / L, Na 2 O content 297g / L), after mixing evenly, aging at room temperature for 24 hours, the desired directing agent can be obtained.

[0033] Preparation of silica-alumina gel: 220g of directing agent, 215ml of aluminum sulfate solution (product of Changling Oil Refinery and Chemical Plant Catalyst Factory, specific gravity 1.28, Al 2 o 3 Content 89.7g / L) and 170ml low sodium metaaluminate solution (Changling Oil Refinery Chemical Plant Catalyst Factory product, specific gravity 1.23, Al 2 o 3 Content 102g / L, Na 2 Add O content 155.1g / L) and 280ml of deionized water into 640ml of water glass (same specifications as above), and continue to s...

Embodiment 2

[0047] The preparation of the directing agent and the silica-alumina gel are the same as in Example 1. Aging 1000g of silica-alumina gel at 60°C for 30h, then adding 100g of diatomaceous earth to the gel, stirring vigorously for 3h, then statically crystallizing at 100°C for 30h, the product was filtered, washed, and dried to obtain NaY molecular sieve. The product is characterized by XRD, BET and SEM techniques, the results show that the crystallinity of NaY molecular sieve is 86.4%, SiO 2 / Al 2 o 3 is 5.33, and the total specific surface area measured by BET method is 670m 2 / g, the grain size is 100-300nm. The above-mentioned molecular sieves are exchanged for REY (RE 2 o 3 %w=15%), and after 800°C, 17h, 100% steam aging, the crystallization retention was 47.9% (compared with before hydrothermal aging).

Embodiment 3

[0049] The preparation of the directing agent and the silica-alumina gel are the same as in Example 1. Aging 1000g of silica-alumina gel at 65°C for 25h, then adding 300g of α-gibbsite to the gel, stirring vigorously for 3h, then statically crystallizing at 100°C for 30h. The product is filtered, washed and dried to obtain NaY molecular sieve. The product is characterized by XRD, BET and SEM technology, the results show that the crystallinity of NaY molecular sieve is 78%, SiO 2 / Al 2 o 3 is 5.23; the specific surface area is 595m 2 / g, the grain size is 200-300nm. The above-mentioned molecular sieves are exchanged for REY (RE 2 o 3 %W=15%), and after 800°C, 17h, 100% steam aging, the crystallization retention was 48.7% (compared with before hydrothermal aging).

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Abstract

The invention discloses a making method of NaY molecular sieve with small grain size, which comprises the following steps: synthesizing guide agent; forming silicon aluminium gel; aging under 10-85 deg.c for 5-50h; adding additive with molar rate of Al2O3 and silicon-aluminium gel at 0.1-1000; crystallizing; recycling product; selecting the additive from one or more of amorphous SiO2, Al2O3, Al2O3primer, ZrO2, AlPO4, TiO2, alumina silica gel and clay.

Description

technical field [0001] The present invention relates to a method for preparing molecular sieves, and more particularly relates to a method for preparing small-grain NaY molecular sieves. Background technique [0002] Y-type molecular sieve is the main active component of catalytic cracking catalyst, and its pore diameter is only 0.74nm. In the heavy oil cracking reaction, in order to effectively convert raw materials into valuable products, oil and vapor molecules must diffuse from the outer surface of molecular sieve grains into the pores, contact with the acid centers in them, and the product molecules after the reaction are desorbed and released. Diffusion to the outer surface of the grain. Since the residual oil macromolecules with a diameter greater than 1nm in the raw material are difficult to diffuse into the pores of the molecular sieve, they can only be adsorbed on the outer surface of the molecular sieve grains for cracking reaction. favorable. The main way to i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/24
Inventor 杜冰罗一斌刘中清
Owner CHINA PETROLEUM & CHEM CORP
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