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Exchange method of rare earth ion for molecular sieve

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 easy clogging of filter cloth meshes, and achieve the effect of high degree of exchange automation and high efficiency

Inactive Publication Date: 2005-08-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to overcome the disadvantage that the existing molecular sieve rare earth ion exchange method is easy to block the filter cloth mesh, and provide a new rare earth ion exchange method for the molecular sieve that is not easy to block the filter cloth mesh

Method used

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  • Exchange method of rare earth ion for molecular sieve
  • Exchange method of rare earth ion for molecular sieve
  • Exchange method of rare earth ion for molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0084] The present example illustrates the method provided by the invention with a Buchner funnel as a separation device simulating an industrial device.

[0085] 1. Formation of filter cake.

[0086] NaY zeolite (same as Comparative Example 1) was mixed with deionized water to prepare a slurry with a pH value of 9 and a solid content of 80 g / L. Add hydrochloric acid to the obtained slurry, adjust the pH value of the slurry to 6.0, heat the obtained slurry to 70°C under stirring, pour it into the Buchner funnel with the filter cloth of the same material as that of Comparative Example 1, and at the same time, put the cloth Vacuum the filter flask of the Scherner funnel to 0.04 MPa. Under vacuum, a layer of about 1.2 cm thick filter cake is formed on the filter cloth of the Buchner funnel, and the waste liquid in the suction filter bottle is emptied.

[0087] Second, ion exchange.

[0088] Keep the vacuum in the filter bottle, when there will be no liquid on the surface of th...

example 2

[0096] The present example illustrates the method provided by the invention with a Buchner funnel as a separation device simulating an industrial device.

[0097] Use the same piece of filter cloth that example 1 uses, repeat above-mentioned whole operation process, when repeating the 30th time, the color of filter cloth still does not change, and filtering speed is still identical with the first time.

example 3-6

[0099] The following examples illustrate the method provided by the invention with the Buchner funnel as the separation device simulation industrial device.

[0100] Carry out rare earth ion exchange to NaY molecular sieve by the method of example 1, difference is, the acid that adds, the pH value of slurry after adding acid, the temperature of slurry, the weight ratio of rare earth oxide and molecular sieve, the temperature and consumption of deionized water are different . The acid added, the pH value of the slurry after adding the acid, the temperature of the slurry, the weight ratio of the rare earth oxide to the molecular sieve, and the temperature and amount of deionized water are shown in Table 1 respectively. The rare earth oxide and sodium oxide contents in the obtained rare earth-containing molecular sieve are shown in Table 2.

[0101] instance number

[0102] instance number

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Abstract

A method of exchanging rare earth ion of a molecular sieve comprises carrying continuously liquid of the molecular sieve with pH 2-7 into the filtering fabric of horizontal band filter, making the filtering fabric carried with liquid of the molecular sieve pass a region of forming filter cake, an ion exchanging region, a wash region, in sequence, then absorbing water, unloading, drying, then obtaining a filter cake of a molecular sieve after exchange. In the ion exchanging region, solution of rare earth compounds with the temperature of 10-100degree C is added into the filter cake, By adding the solution of rare earth compounds, the weight ratio of rare earth oxide compounds to the molecular sieve is 0.01-0.2. By the invention, no rare earth precipitation is produced, filtering fabric could be used for a long time.

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] Rare earth-containing molecular sieves are various catalysts, such as the common active components of cracking catalysts, which are usually ion-exchanged with a sodium-type molecular sieve with a sodium content of not less than 1% by weight with a rare earth compound solution, or with an ammonium-containing compound and a rare earth compound The mixed aqueous solution is ion-exchanged, and the obtained filter cake is dried or not dried, and then roasted to obtain it. [0003] In order to exchange more rare earths on the molecular sieve, it is not desirable that the cationic sites on the molecular sieve be occupied by ammonium ions. Ion exchange is performed with an aqueous solution of rare earth compounds. [0004] There are two methods for exchanging r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/04C01B39/02
Inventor 马跃龙江磊邓景辉达志坚何鸣元陈玉玲
Owner CHINA PETROLEUM & CHEM CORP
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