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Lithium-type low-silica faujasite, its preparation method and use

A faujasite and medium-silicon octahedral technology, which is applied in the field of lithium-type low-silicon faujasite, can solve the problems of reduced mechanical strength of shaped particles, reduced adsorption performance, and slow crystallization speed, achieving excellent adsorption performance and easy operation , the effect of stable quality

Active Publication Date: 2019-02-22
CATLION CO LTD
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Problems solved by technology

This method overcomes the shortcomings of slow crystallization speed and obvious decrease in the mechanical strength of shaped particles after zeolization, which are common in other methods
But this method has following shortcoming: the LSX component that the raw powder of synthetic zeolite LSX or binding agent is transformed into all contains about 2% A-type zeolite impurity, thereby has reduced the adsorptive performance of product

Method used

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  • Lithium-type low-silica faujasite, its preparation method and use

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preparation example Construction

[0014] A preparation method of lithium-type low-silicon faujasite, comprising the following steps:

[0015] (1) SiO 2 / Al 2 o 3 The shaped particles of medium silica faujasite with a molar ratio of 2.2 to 3.0 are uniformly mixed with a caustic solution comprising sodium hydroxide and potassium hydroxide to prepare a reaction mixture;

[0016] (2) carrying out the hydrothermal reaction to the reaction mixture in the step (1), to obtain a shaped low-silicon faujasite solid product;

[0017] (3) Exchanging the solid product obtained in step (2) with lithium to obtain shaped lithium-type low-silicon faujasite.

[0018] Each step is described in detail below.

[0019] In step (1) of the method of the present invention, the molar concentration of the caustic solution comprising sodium hydroxide and potassium hydroxide is 1-10mol / L, preferably 3-8mol / L, more preferably 5-7.5mol / L , wherein the K / (Na+K) molar ratio is 0.1-0.5, preferably 0.20-0.4, more preferably 0.25-0.35.

[0...

Embodiment 1

[0039] 407.6 grams of sodium hydroxide (98.0% purity) and 255.0 grams of potassium hydroxide (85% purity) were successively stirred and dissolved in 1680.7 grams of water. Due to the exothermic solution heat up, after complete dissolution, let the solution cool, then add a small amount of water to compensate for the evaporated water, until the initial concentration. 406.7 g of SiO 2 / Al 2 o 3 Shaped particles of medium silica faujasite with a molar ratio of 2.27 (marked as R1; uncalcined activated binderless 13X spherical shape, 1.6 mm in diameter, Germany CWK, 13XBFK) were added to the above caustic solution.

[0040] After stirring the mixture slightly, the mixture was then heated to 77°C under static conditions to carry out the hydrothermal reaction of crystal transformation. After 25 hours of reaction, the reaction was complete. After cooling, the NaKLSX particle product, labeled P1, was recovered through filtration, washing and drying steps. Table 1 shows the changes...

Embodiment 2

[0043] In 1437.8 grams of deionized water, 348.6 grams of sodium hydroxide (98.0% purity) and 221.2 grams of potassium hydroxide (85% purity) were added sequentially and stirred until a completely dissolved liquid was formed. 392.3 g of SiO 2 / Al 2 o 3 Raw materials with a molar ratio of 2.52 (marked as R2; after absorbing moisture, 13X spherical balls with a binder and a diameter of 0.6mm, Luoyang Jianlong, JLOX-501) were added to the prepared solution to obtain a mixture.

[0044] After the mixture was slightly stirred, it was heated to 75° C. under static conditions to carry out the hydrothermal reaction of crystal transformation. After 38 hours of reaction, the reaction was complete and the heating was stopped. After cooling, the NaKLSX particle product, labeled as P2, was recovered through filtration, washing and drying steps.

[0045] Table 1 shows the changes in the silicon-aluminum ratio of the chemical composition before and after the conversion of molecular sieve...

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Abstract

The invention relates to a preparation method of lithium type low-silicon faujasite. The method comprises the following steps of (1) uniformly mixing forming particles of medium-silicon faujasite with the SiO2 / Al2O3 mol ratio being 2.2 to 3.0 and caustic solution comprising sodium hydroxide and potassium hydroxide for preparing a reaction mixture; (2) performing hydrothermal reaction on the reaction mixture in the step (1) to obtain the formed low-silicon faujasite solid product; (3) performing lithium exchange on the solid products obtained in the step (2) to prepare formed lithium type low-silicon faujasite. The invention also relates to the lithium type low-silicon faujasite prepared by the method and a purpose of the lithium type low-silicon faujasite as an adsorbent.

Description

technical field [0001] The invention relates to a lithium-type low-silicon faujasite, its preparation method and its use as an adsorbent. Background technique [0002] Low silicon faujasite, referred to as LSX (low silica X), usually refers to SiO 2 / Al 2 o 3 An aluminum silicate microporous material with a molar ratio of 1.9 to 2.1 and a framework structure of faujasite (FAU). LSX has excellent gas adsorption properties. Lithium-type LSX prepared by ion exchange can be used as a zeolite molecular sieve adsorbent material, which can be used as an adsorbent material with the best efficiency in separating and enriching oxygen in the air under conditions close to normal temperature and pressure. At present, LSX zeolite has been widely used in pressure swing adsorption air separation and oxygen production industry. [0003] The synthetic LSX molecular sieve raw powder particles are only a few microns, while the adsorbent required by the industrial pressure swing adsorption ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/20B01J20/18B01J20/30B01D53/02
CPCB01D53/02B01J20/041B01J20/186C01B39/20C01P2006/80
Inventor 李奋杨家琪杨家路杨振兴杨伟地石金风张钱丽
Owner CATLION CO LTD
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