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Ammonium and rare earth ion mixed exchange method of molecular sieve

A rare earth ion and ion exchange technology, which is applied in the field of ion exchange of molecular sieves, can solve the problems of sodium molecular sieve exchange, and achieve the effect of uniform rare earth content, high efficiency and high degree of automation of exchange

Inactive Publication Date: 2005-06-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although the method described in US 3,943,233 provides a general method for carrying out ion exchange on a belt filter, how to carry out ammonium and rare earth ion exchange on sodium molecular sieves has no specific instructions

Method used

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  • Ammonium and rare earth ion mixed exchange method of molecular sieve
  • Ammonium and rare earth ion mixed exchange method of molecular sieve
  • Ammonium and rare earth ion mixed exchange method of molecular sieve

Examples

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Effect test

example 1

[0071] This example uses a Buchner funnel as a separation device to simulate an industrial device to illustrate the method provided by the present invention.

[0072] Since the cloth funnel filtration device also undergoes stages such as filter cake formation, ion exchange (or countercurrent exchange before ion exchange), washing and drying, but these steps are carried out separately, it is continuously carried out with the belt filter. process is equivalent.

[0073] 1. Formation of filter cake.

[0074] The NaY zeolite (sodium oxide content is 14.3% by weight, unit cell constant is 24.66 angstroms, produced by Qilu Petrochemical Company Catalyst Factory) is mixed with deionized water to prepare a slurry with a solid content of 100 g / L, and the obtained slurry is stirred. Heated to 80°C under lower temperature, poured into a Buchner funnel, and at the same time, evacuated the filter bottle of the Buchner funnel to 0.05 MPa. Under the action of vacuum, a layer of filter cake...

example 2

[0085] This example uses a Buchner funnel as a separation device to simulate an industrial device to illustrate the method provided by the present invention.

[0086] 1. Formation of filter cake

[0087] The NaY zeolite (sodium oxide content is 13.8% by weight, unit cell constant is 24.65 angstroms, produced by Qilu Petrochemical Company Catalyst Factory) is mixed with deionized water to prepare a slurry with a solid content of 150 g / L, and the obtained slurry is stirred. Heated to 80°C under lower temperature, poured into a Buchner funnel, and at the same time, evacuated the filter bottle of the Buchner funnel to 0.04 MPa. Under the action of vacuum, a layer of filter cake with a thickness of about 1.2 cm was formed on the filter cloth of the Buchner funnel, and the waste liquid in the suction filter bottle was emptied.

[0088] 2. Countercurrent exchange

[0089] Keep the vacuum degree in the filter bottle. When there is no liquid on the surface of the filter cake, slowly ...

example 3

[0100] This example uses a Buchner funnel as a separation device to simulate an industrial device to illustrate the method provided by the present invention.

[0101] 1. Formation of filter cake

[0102] The NaY zeolite (sodium oxide content is 14.5% by weight, unit cell constant is 24.66 angstroms, produced by Qilu Petrochemical Company Catalyst Factory) is mixed with deionized water to prepare a slurry with a solid content of 80 g / L, and the obtained slurry is stirred. Heated to 90°C at lower temperature, poured into a Buchner funnel, and at the same time, evacuated the filter bottle of the Buchner funnel to 0.03 MPa. Under the action of vacuum, a layer of filter cake with a thickness of about 0.8 cm was formed on the filter cloth of the Buchner funnel, and the waste liquid in the suction filter bottle was emptied.

[0103] 2. Countercurrent exchange

[0104] Keep the vacuum degree in the filter bottle. When the surface of the filter cake is about to have no liquid, immedi...

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Abstract

The ammonium and rare earth ion mixed exchange method of molecular sieves includes loading the slurry of sodium-containing molecular sieves on the filter cloth of the horizontal belt filter, passing through a filter cake forming area, an ion exchange area and a washing area in sequence, sucking dry, unloading and drying the resulting filter cake, in the ion exchange area, add the mixed aqueous solution containing ammonium salt and rare earth compound from the top of the filter cake, the amount of the mixed aqueous solution containing ammonium salt and rare earth compound is based on ammonium chloride, ammonium salt The weight ratio of the rare earth oxide to the molecular sieve is 0.01-2, and the weight ratio of the rare earth oxide to the molecular sieve is 0.01-0.2. The method has the advantages of high exchange automation, water saving and high efficiency. In particular, the rare earth content in the rare earth-containing molecular sieve obtained after the exchange by the method is more uniform.

Description

Field of Invention [0001] The present invention relates to an ion exchange method for molecular sieves, and more particularly to a mixed exchange method for ammonium and rare earth ions of molecular sieves. Background technique [0002] The rare earth-containing molecular sieve is a common active component of various catalysts, such as cracking catalysts. It is usually obtained by ion-exchanging sodium-type molecular sieves with a sodium content of not less than 1% by weight with ammonium chloride solution and rare earth chloride solution. The filter cake is dried or not dried and then calcined. [0003] There are two methods for exchanging ammonium and rare earth ions for sodium molecular sieves. [0004] The first method is to first mix and beat the sodium molecular sieve with the ammonium salt aqueous solution for ion exchange, and then mix and beat the rare earth compound aqueous solution for ion exchange, filter, wash, dry, roast or not roast....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/04B01J37/30
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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