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Molecular sieve RE ion exchange method

A rare earth ion and ion exchange technology, applied in the field of rare earth ion exchange of molecular sieves, can solve problems such as inability to exchange, and achieve the effects of low water consumption and high efficiency

Inactive Publication Date: 2003-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Compared with the prior art, the method provided by the present invention overcomes the shortcoming that the prior art cannot perform rare earth ion exchange on the cross-baked Y-type molecular sieve on the belt filter, and successfully completes the exchange of rare earths on the belt filter. Rare earth ion exchange with a baked Y-type molecular sieve

Method used

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  • Molecular sieve RE ion exchange method
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Examples

Experimental program
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Effect test

example 1

[0044] The cross-baking ultra-stable Y molecular sieve described in Comparative Example 1, deionized water and the filtrate A1 described in Comparative Example 1 are mixed and beaten to make a molecular sieve content of 120 grams per liter containing molecular sieve, wherein salt (i.e. the filtrate used The amount of rare earth chloride and sodium chloride contained in A1 is 1.1% by weight of the molecular sieve. The obtained molecular sieve slurry was heated to 90° C., poured into a Buchner funnel, and at the same time, the filter bottle was evacuated to 0.07 MPa to form a filter cake with a thickness of 10 mm on the filter cloth. When there is no liquid on the surface of the filter cake, immediately add a rare earth chloride solution (wherein La 2 o 3 The content is 16.6 g / L, CeO 2 The content of the rare earth oxide is 29.6 grams per liter, and the other rare earth oxide content is 3.8 grams per liter), the addition speed ensures that the surface of the filter cake does n...

example 2

[0046] The cross-calcined hydrogen Y molecular sieve described in comparative example 2, deionized water and the filtrate A2 described in comparative example 2 are mixed and beaten to make a slurry with a molecular sieve content of 200 grams per liter, wherein the salt (i.e. the used filtrate A2) Containing rare earth chloride and sodium chloride) in an amount of 1.7% by weight of molecular sieves. The obtained molecular sieve slurry was heated to 90° C., poured into a Buchner funnel, and at the same time, the filter bottle was evacuated to 0.05 MPa. A filter cake with a thickness of 12 mm was formed on the filter cloth. When there is no liquid on the surface of the filter cake, it is 40 grams per liter to add the rare earth oxide content immediately, and the temperature is a rare earth chloride solution (the ratio of each rare earth oxide is the same as example 1) at 90°C, and the addition speed ensures that the surface of the filter cake does not form turtle Crack, the cons...

example 3

[0048] Take by weighing one calcined rare earth Y molecular sieve described in comparative example 3, deionized water and the filtrate A3 described in comparative example 3 and mix and make a slurry, make the molecular sieve content and be the slurry containing molecular sieve of 150 g / liter, wherein salt (i.e. used The amount of rare earth chloride and sodium chloride contained in the filtrate A3 is 2.5% by weight of the molecular sieve. The obtained molecular sieve slurry was heated to 70° C., poured into a Buchner funnel, and at the same time, the filter flask was evacuated to 0.05 MPa. A filter cake with a thickness of 8 mm was formed on the filter cloth. When there is no liquid on the surface of the filter cake, immediately add a rare earth chloride solution (where La 2 o 3 The content is 41.7 g / L, CeO 2 The content of the rare earth oxide is 3.7 grams per liter, and the content of other rare earth oxides is 4.6 grams per liter), the addition speed ensures that the sur...

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Abstract

The RE ion exchange method for molecular sieve includes pulping molecular sieve with water, feeding the obtained slurry to filtering cloth of horizontal vacuum belt filter continuously, passing the slurry successively through a filter cake forming area and an ion exchange area with vacuum acceptors below the filtering cloth to wash and sucking dry the filter cake, and unloading the filter cake. The molecular sieve is Y-type molecular sieve, and some acid and / or salt in the amount of 0.1-5 wt% of molecular sieve are added to the slurry. Some solution containing RE ion is added to the filter cake over the ion exchange area with the weight ratio between the RE oxide and the molecular sieve being 0.01-0.5.

Description

field of invention [0001] The present invention relates to a molecular sieve ion exchange method, more specifically to a molecular sieve rare earth ion exchange method. 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 24.48-24.66 an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/08C01B39/24
Inventor 马跃龙邓景辉陈玉玲达志坚何鸣元江磊
Owner CHINA PETROLEUM & CHEM CORP
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