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Ammonium ion exchange method of molecular sieve
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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 ammonium ion exchange and achieve high efficiency and low water consumption
Inactive Publication Date: 2004-11-17
CHINA PETROLEUM & CHEM CORP +1
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[0011] Compared with the prior art, the method provided by the present invention overcomes the shortcoming that the prior art cannot perform ammonium ion exchange on cross-baked Y-type molecular sieves on a belt filter, and successfully realizes one-to-one exchange on a belt filter. One baked Y molecular sieve for ammonium ion exchange
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example 1
[0036] This example illustrates the method provided by the invention.
[0037] With 30 grams of calcined rare earth hydrogen Y molecular sieve (rare earth oxide content is 2.0% by weight, wherein, La 2 o 3 Content is 1.7 wt%, CeO 2 The content is 0.2% by weight, the content of other rare earth metal oxides is 0.1% by weight, the content of sodium oxide is 4.6% by weight, and the unit cell constant is 24.63 angstroms, produced by Lanzhou Refining and Chemical Company Catalyst Factory), deionized water and sodium hydroxide (chemical Pure) beating together, so that the content of molecular sieve in the obtained slurry is 200 grams per liter, the amount of sodium hydroxide is 1% by weight of molecular sieve, heated to 80 °C under stirring, and the obtained slurry is poured into the filter of a Buchner funnel On the cloth, vacuumize the filter bottle to 0.03 MPa, and filter under this vacuum until there is no liquid on the surface of the filter cake, and record the linear velocit...
example 2
[0042] This example illustrates the method provided by the invention.
[0043] By the method of example 1, a calcined rare-earth hydrogen Y molecular sieve is beaten, filtered, exchanged, washed and recorded separation filtration speed, exchange filtration speed and washing filtration speed, the difference is to replace sodium hydroxide with 25% by weight of strong ammonia water, The consumption of concentrated ammonia water makes the consumption of ammonia be 3 weight % of molecular sieve consumption. The results are listed in Tables 1 and 2, respectively.
example 3
[0045] This example illustrates the method provided by the invention.
[0046] By the method of example 1, a calcined rare earth hydrogen Y molecular sieve is beaten, filtered, exchanged, washed and record separation and filtration speed, exchange filtration speed and washing filtration speed, the difference is that the rare earth oxidation rare earth content of the rare earth hydrogen Y molecular sieve used is 7.0 wt. % where La 2 o 3 Content is 2.3 wt%, CeO 2 The content is 4.1% by weight, the content of other rare earth oxides is 0.6% by weight, the content of sodium oxide is 4.0% by weight, and the content of molecular sieve in the slurry is 150 g / L. The results are listed in Tables 1 and 2, respectively.
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Abstract
The ammonium ion exchange process of molecular sieve includes beating the mixture of the molecular sieve and water to obtain slurry; loading the slurry to filtering belt of horizontal belt-type vacuum filtering machine, passing the slurry through one filter cake forming area and one ion exchange area with vacuum liquid acceptors below the belt, washing, sucking to dry filter cake and unloading the filter cake. The molecular sieve is Y-type molecular sieve, the slurry contains also alkali or alkali-salt mixture with alkali content of 0.1-8 wt% and salt content of 0-5 wt%, the liquid acceptor in the filter cake forming area has such vacuum degree that no chap is formed in the filter cake, and ammonium ion solution is added from the upper part of filter cake in the ion exchange area with the solution concentration and use amount and the liquid acceptor vacuum degree in the ion exchange area being such that the ultimate Y-type molecular sieve has sodium oxide content not higher than 1.5 w.
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 NaY molecular sieve with an aqueous solution containing ammonium ions and / or rare earth ions for ion exchange, washing, drying and roasting is generally called an 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 angstroms, and t...
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