High crystallinity modified Y zeolite and its preparation method

A technology with high crystallinity and relative crystallinity, applied in the direction of crystalline aluminosilicate zeolite, octahedral crystalline aluminosilicate zeolite, chemical instruments and methods, etc., can solve zeolite structural damage, low cracking activity, and zeolite crystallinity decrease And other issues

Active Publication Date: 2008-08-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The obvious disadvantages of amorphous catalysts are: (1) low cracking activity, and the initial reaction temperature is generally above 400°C; (2) poor production flexibility, and the product distribution cannot be greatly changed by increasing the reaction temperature to adapt to the market season (3) Poor adaptability to raw material changes, usually the dry point of raw material oil is limited below 515°C
[0007] The silicon-aluminum ratio of zeolites can usually be changed by hydrothermal dealumination and / or chemical dealumination, but in deep dealumination (SiO 2 / Al 2 o 3 Molar ratio ≥ 15) process will often lead to the destruction of zeolite structure, so that the crystallinity of zeolite decreases, the surface area decreases, and it is difficult to obtain zeolite products with good crystallinity

Method used

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  • High crystallinity modified Y zeolite and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0021] (1) Add 160kg of industrial NH to the exchange tank 4 NO 3 (Liaoyang Petrochemical Company product, purity>99.5%) and 910kg deionized water, then add 100kg NaY zeolite (Wenzhou Catalyst Factory produces, crystallinity is 100%, unit cell constant is 2.470nm, SiO 2 / Al 2 o 3 Molar ratio is 5.1, Na 2 O content is 12.0w%), the temperature is raised to 90 ° C, exchanged for 1.0 hour under stirring conditions, filtered, repeated exchanged 2 times, the filter cake is washed to neutral, dried to obtain Na 2 NH with an O content of 2.2w% 4 NaY zeolite.

[0022] (2), take NH 4 1.0kg of NaY zeolite was placed in a heat treatment furnace, and the temperature was raised to 600°C in 1.5 hours, and treated at 600°C and 0.15MPa steam pressure for 2.0 hours, and the sample was taken out after cooling down.

[0023] (3) Take 500 g of the zeolite sample after the first heat treatment and contact it with 5.0 L of 1.5 mol / L ammonium chloride solution, adjust the pH of the slurry to 6...

example 2

[0027] Get the NH obtained in step 1 in Example 1 4 300g of NaY zeolite (calculated on a dry basis) was placed in a heat treatment furnace at 600°C, and water vapor (100g / h) was injected to maintain the system pressure at 0.08MPa for 3.0 hours; then the sample was treated with 2mol / L NH 4 NO 3 Solution 3.0L contacted with HNO 3 Adjust the pH of the slurry to 4.8, and stir and exchange at 95°C for 1.0 hour, repeat the exchange 2 times, and wash; put the wet filter cake into a heat treatment furnace, and hydrothermally treat it at 700°C and 0.15MPa for 3.0 hours; the final sample is heated with 0.6 3.0L of mol / L HCl was dealuminated at 60°C for 1.5 hours to obtain product B. The physical and chemical properties of product B are listed in Table 1.

example 3

[0029] Get the NH obtained in step 1 in Example 1 4 500g of NaY zeolite (calculated on a dry basis) was placed in a heat treatment furnace and treated for 2.0 hours at 640°C with its own water vapor pressure of 0.1MPa. The sample was treated with 2mol / L NH 4 Exchange 2.5L of Cl solution, adjust the pH of the slurry to 5.8 with HCl before the exchange, and repeat the exchange 3 times. The filter cake is hydrothermally treated at 660°C and 0.1MPa for 5.0 hours, and the sample after hydrothermal treatment is treated with 0.2mol / L HCl 5.0 L of the solution was treated twice at 90° C. for 1.5 hours each time, filtered with suction, the filter cake was washed with distilled water, and dried to obtain product C. The physical and chemical properties of product C are shown in Table 1.

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Abstract

The invention discloses a high-crystallinity modified Y-zeolite with cell parameter at 2.425-2.435nm, relative crystallinity not less than 95% and specific surface area at 800-950m2 / g, which is characterized by the following: adopting NaY zeolite as raw material to do amino exchange through ammonium salt solution; controlling the exchanging degree not less than 80%; placing in the water heat disposing furnace under 400-700 deg.c at 0.05-0.5Mpa for 1.0-5.0h; contacting the zeolite sample and ammonium salt solution; controlling the pH value; exchanging Na+ in the zeolite further; stripping non-frame aluminium selectively; proceeding secondary water heat disposal; setting the molar rate of SiO2 / Al2O3 at 15-16; obtaining the product.

Description

technical field [0001] The invention relates to a modified Y zeolite with high crystallinity, in particular to a preparation method of the modified Y zeolite with high crystallinity. Background technique [0002] Hydrocracking catalysts can be divided into two categories: amorphous catalysts and molecular sieve catalysts according to the different acidic carrier components. Amorphous catalysts use amorphous silica-alumina as acidic supports, and have a low density of acidic centers. The obvious disadvantages of amorphous catalysts are: (1) low cracking activity, and the initial reaction temperature is generally above 400°C; (2) poor production flexibility, and the product distribution cannot be greatly changed by increasing the reaction temperature to adapt to the market season (3) Poor adaptability to raw material changes, usually the dry point of raw material oil is limited below 515°C. Molecular sieve catalysts use modified Y-type molecular sieves as acidic carriers, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/24B01J29/08C10G45/12
Inventor 阮彩安
Owner CHINA PETROLEUM & CHEM CORP
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