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Ammonium and rare enrth ion exchange method of molecular sieve

A rare earth ion and ion exchange technology, applied in the field of ion exchange of molecular sieves, can solve the problems of easy clogging of filter cloth mesh, and achieve the effect of high degree of automation and high efficiency of exchange

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

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Problems solved by technology

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

Method used

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  • Ammonium and rare enrth ion exchange method of molecular sieve
  • Ammonium and rare enrth ion exchange method of molecular sieve
  • Ammonium and rare enrth ion exchange method of molecular sieve

Examples

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example 1

[0144] The present example illustrates the method provided by the invention with a Buchner funnel as a separation device simulating an industrial device.

[0145] 1. Formation of filter cake.

[0146] Mix and beat NaY zeolite (the specifications are the same as in Comparative Example 1) and deionized water to prepare a slurry with a pH value of 8 and a solid content of 100 g / L. The resulting slurry is heated to 70°C under stirring and poured into a Buchner funnel , At the same time, vacuumize the filter flask of the Buchner funnel to 0.05 MPa. Under vacuum, a layer of filter cake about 1 cm thick is formed on the filter cloth of the Buchner funnel, and the waste liquid in the suction filter bottle is emptied. The filter cloth used is the same as that of Comparative Example 1.

[0147] Second, pH adjustment.

[0148] Keep the vacuum in the filter bottle. When there is no liquid on the surface of the filter cake, immediately and slowly add an aqueous solution of hydrochloric ...

example 2

[0158] The present example illustrates the method provided by the invention with a Buchner funnel as a separation device simulating an industrial device.

[0159] 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

[0161] The following examples illustrate the method provided by the invention with the Buchner funnel as the separation device simulation industrial device.

[0162] Carry out rare earth ion exchange to NaY molecular sieve by the method of example 1, difference is, (1) the temperature of molecular sieve slurry is different, (2) used hydrochloric acid solution is replaced with other acid or ammonium salt solution when adjusting pH value, makes inflow filter bottle The waste liquid drops to different pH values; (3) The type, concentration, temperature and / or amount of the solution used for ion exchange are different. The temperature of the slurry containing molecular sieves, the acid or ammonium salt used when adjusting the pH value, the pH value that the waste liquid flowing in the filter bottle is reduced to, the type, temperature and / or consumption of the solution used for ion exchange are listed in Table 1 respectively. The rare earth oxide and sodium oxide contents in the o...

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Abstract

A molecular sieve ammonium and rare earth ion exchange method comprising continuously loading a molecular sieve-containing slurry onto a filter cloth of a horizontal belt filter, sequentially passing the filter cloth loaded with the molecular sieve slurry through a filter cake formation zone, an ion exchange zone and a washing zone, sucking dry, unloading and drying the obtained filter cake, wherein, before said ion exchange zone, also includes a pH adjustment zone, in the pH adjustment zone, from the upper part of the filter cake, the temperature is 10-100 Ammonium salt and / or acid aqueous solution with a pH value of 2-7 in °C, the amount of ammonium salt and / or acid aqueous solution reduces the pH value of the waste liquid obtained after pH adjustment to 2-7. The biggest advantage of this method is that it overcomes the disadvantage that the mesh of the filter cloth of the belt filter is easily blocked, and the filter cloth can be used for a long time. Moreover, the rare earth content in the molecular sieves in the upper and lower parts of the obtained filter cake is basically the same, and it also has the advantages of high degree of automation, water saving and high efficiency.

Description

field of invention [0001] The present invention relates to an ion exchange method for molecular sieves, more specifically to a method for ammonium and rare earth ion exchange for molecular sieves. 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 1-15% by weight with a rare-earth compound solution, or with an ammonium-containing salt 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 an appropriate amount of rare earth on the molecular sieve, it is desirable that the cationic sites on the molecular sieve be partially occupied by ammonium ions. In this case, it is desirable to use a mixed aqueous solution containing ammonium salts ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/06B01J37/30
Inventor 马跃龙陈玉玲邓景辉达志坚何鸣元
Owner CHINA PETROLEUM & CHEM CORP
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