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Molecular sieve ammonium ion exchange process

A technology of ammonium ion exchange and ion exchange, which is applied in the field of ammonium ion exchange of molecular sieves, can solve the problems of slow filtration speed, poor permeability, and slow penetration of filter cake, and achieve the effect of high efficiency and low water consumption

Inactive Publication Date: 2005-04-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the very small particles of the cross-baked Y-type molecular sieve in the water slurry of the cross-baked Y-type molecular sieve and the inherent properties of the cross-baked Y-type molecular sieve, when the cross-baked Y-type molecular sieve is mixed with water to form a slurry After loading the filter belt of the upper belt filter, the formed filter cake is a very dense and poorly permeable filter cake, and the filtration speed (the speed at which liquid penetrates the filter cake) is very slow
When performing ammonium ion exchange, the solution containing ammonium ions is added from the upper part of the filter cake, and the speed of penetrating the filter cake is slower, making the ammonium ion exchange process impossible
Therefore, in the prior art, there is no method for carrying out ammonium ion exchange on a belt filter to a roasted Y-type zeolite.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0042] The cross-baking ultra-stable Y molecular sieve described in Comparative Example 1, deionized water and the waste liquid A1 described in Comparative Example 1 were mixed and beaten to make a molecular sieve-containing slurry with a molecular sieve content of 120 grams per liter, wherein the salt ( That is, the amount of ammonium chloride and sodium chloride contained in the used waste liquid A1 is 1.1% by weight of the molecular sieve amount. The obtained molecular sieve slurry was heated to 90° C., poured into a Buchner funnel, and at the same time, the filter flask was evacuated to 0.07 MPa. A filter cake with a thickness of about 10 mm is formed on the filter cloth. When there is no liquid on the surface of the filter cake, immediately add the ammonium chloride solution with a concentration of 50 g / liter and a temperature of 90° C. The speed of adding ensures that no cracks are formed on the surface of the filter cake until the addition is complete. The amount of am...

example 2

[0044] Weigh the cross-calcined hydrogen Y molecular sieve described in comparative example 2, deionized water and the waste liquid A2 obtained in comparative example 2 are mixed and beaten, and the obtained molecular sieve content is 200 grams per liter of molecular sieve-containing slurry, wherein, salt (i.e. The amount of ammonium chloride and sodium chloride contained in the used waste liquid A2 is 1.7% by weight of the molecular sieve amount. The obtained molecular sieve slurry was heated to 90° C. and poured into a Buchner funnel. At the same time, the filter bottle was evacuated to 0.07 MPa to form a filter cake about 10 mm thick on the filter cloth. When there is no liquid on the surface of the filter cake, immediately add a concentration of 50 grams per liter and a temperature of ammonium chloride aqueous solution at 90°C. The speed of adding ensures that no cracks are formed on the surface of the filter cake, and the ammonium chloride consumption makes the weight rat...

example 3

[0046] A calcined rare earth Y (REY) molecular sieve (unit cell constant is 24.65 angstroms, sodium oxide content is 4.3% by weight, rare earth oxide RE 2 o 3 The content is 14.2% by weight, of which, La 2 o 3 Content is 4.7% by weight, CeO 2 Content is 8.4% by weight, other rare earth oxide content is 1.1% by weight, Qilu Petrochemical Company Catalyst Factory produces), deionized water and the waste liquid A1 that comparative example 1 obtains are mixed and prepared into molecular sieve content and are 150 g / liter containing molecular sieve Slurry, the amount of salt in the slurry (that is, the ammonium chloride and sodium chloride contained in the used waste liquid A1) is 2.5% by weight of the molecular sieve amount. The resulting molecular sieve-containing slurry was heated to 60° C. and poured into a Buchner funnel. At the same time, the filter bottle was evacuated to 0.05 MPa to form a filter cake about 10 mm thick on the filter cloth. When there is no liquid on the ...

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PUM

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Abstract

The molecular sieve ammonium ion exchange process includes beating the molecular sieve and water, loading the slurry to horizontal belt vacuum filter, passing a filter cake forming area and an ion exchange area, where there is vacuum pumped liquid acceptor below the filter belt, washing, sucking to dry filter cake and unloading the filter cake from the filter belt. The molecula sieve is Y-type molecular sieve, to the slurry is also acid and / or salt added in the amount of 0.1-5 wt% of molecualr sieve the said vacuum is so that the filter cake has no crack, solution containing ammonium ion is added over the filter cake in the ion exchange area, and the sodium oxide content of Y-type molecular sieve is lower than 1.5 wt%.

Description

field of invention [0001] The present invention relates to an ion exchange method for molecular sieves, more specifically to an ammonium ion exchange method for molecular sieves. Background technique [0002] Y-type molecular sieves are commonly used active components of catalysts, and the Y-type molecular sieves contained in catalysts, such as hydrocarbon cracking catalysts, are all prepared from NaY molecular sieves. The Y-type molecular sieve obtained by mixing sodium Y molecular sieve with an aqueous solution containing ammonium ions and / or rare earth ions for ion exchange, washing, drying and roasting is usually called cross-baking Y-type molecular sieve. It includes cross-baked ultra-stable Y-type molecular sieve USY, cross-baked rare earth Y-type molecular sieve REY, cross-baked rare earth hydrogen Y-type molecular sieve REHY and cross-baked hydrogen Y molecular sieve HY. The unit cell constant of the cross-baked Y-type molecular sieve is 24.48...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/24
Inventor 马跃龙邓景辉陈玉玲达志坚何鸣元
Owner CHINA PETROLEUM & CHEM CORP
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