Preparation method and application of hybrid cation LiCa-LSX molecular sieve

A technology of mixing cations and molecular sieves, applied in molecular sieves and alkali exchange compounds, separation methods, silicon compounds, etc., can solve the problem that Li+ cannot be effectively utilized, and achieve the effects of easy cost control, short processing time and low exchange degree.

Active Publication Date: 2017-12-19
LUOYANG JALON MICRO NANO NEW MATERIALS CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For LiX molecular sieves, only the III (SIII) position can be combined with N 2 (O 2 ) combination, which is due to the oxygen surrounding the framework and the small-sized Li + The electron shielding effect makes the Li+ at the SII site cannot be effectively used

Method used

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  • Preparation method and application of hybrid cation LiCa-LSX molecular sieve
  • Preparation method and application of hybrid cation LiCa-LSX molecular sieve
  • Preparation method and application of hybrid cation LiCa-LSX molecular sieve

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Experimental program
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Effect test

Embodiment 1

[0041] 1. Na-LSX is exchanged for Ca-LSX.

[0042] Glass beakers are used for tank exchange, each exchange is 6 hours, and the temperature of the exchange liquid is 25°C. The specific operation is as follows:

[0043] Add 88 mL of 1.0 M CaCl to 50 g NaLSX powder (dry basis) 2 In the solution, use a magnetic stirrer to mix and stir, each exchange time is 6 hours, repeat the exchange 6 times, and finally use 500 mL deionized water to filter and wash on a vacuum filter bottle, and the filter cake is dried in a furnace at 25 °C .

[0044] 2. Mixed ion exchange.

[0045] Glass beakers are used for tank exchange, each exchange is 1 hour, and the temperature of the exchange liquid is 25°C. The specific operation is as follows:

[0046] Take two glass beakers, add 1.5 g of the CaLSX powder prepared above, respectively, and exchange them with 0.1M LiCl solution to control the Li in the beakers. + The amounts of the initial substances were the CaLSX contained in the original powder ...

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Abstract

The invention discloses a preparation method and application of a hybrid cation LiCa-LSX molecular sieve. The method comprises the following steps: I, preparing a CaLSX molecular sieve, and performing multiple times of exchange with a solution with Ca<2+> to completely substitute Na<+> in the CaLSX molecular sieve by Ca<2+>; II, exchanging the CaLSX molecular sieve into a LiCa-LSX molecular sieve, exchanging by using a solution with Li<+>, directly performing vacuum suction without washing an exchanged sample, performing normal-temperature drying, and performing activation pretreatment on the sample, thereby obtaining the hybrid cation LiCa-LSX molecular sieve. The LiCa-LSX molecular sieve can be used as a selective adsorbent for N2 and O2 in a PSA / VPSA oxygen making process. In filtration, water washing is avoided, and then the case that Li<+> is lost because Li<+> is substituted by H<+> because of hydrolysis is avoided; in the exchange process, Li<+> is low in exchange degree and small in use amount, and the cost is easy to control; the lowest activation temperature applicable to sufficient dehydration of the LiLSX molecular sieve is adopted, the treatment time is short, Li<+> is prevented from migrating to relatively low positions (SI and SII), and thus a case that Li<+> can be in the SII position can be ensured sufficiently.

Description

technical field [0001] The invention relates to a preparation method of a molecular sieve, in particular to a preparation method and application of a mixed cation LiCa-LSX molecular sieve. Background technique [0002] With the development of industry and social economy, the application fields of high-purity oxygen and nitrogen are becoming more and more extensive, including oil refining, medical treatment, metal production, food processing and chemicals, etc. Among them, cryogenic distillation to separate air and pressure swing adsorption (PSA) are two main technologies for producing high-purity oxygen and nitrogen. LiLSX molecular sieve is used as pressure swing adsorption air separation oxygen production adsorbent, which has the advantages of large nitrogen adsorption capacity and high nitrogen and oxygen separation coefficient. The technical key to prepare LiLSX molecular sieve adsorbent is to exchange NaLSX molecular sieve with Li+. Studies have shown that when Li + ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/18B01J20/30B01D53/047B01D53/04C01B13/02C01B39/22
CPCB01D53/04B01D53/047B01J20/186C01B13/027C01B39/22C01B2210/0018B01D2256/12B01D2257/102B01D2253/1085B01J2220/4806B01D53/02C01B39/026B01J20/3078B01J20/3085B01D2258/06B01D2257/104B01D2256/10B01D53/0476C01B33/2846B01D2253/108B01J20/18
Inventor 李建波刘应书杨雄郭艳霞
Owner LUOYANG JALON MICRO NANO NEW MATERIALS CO LTD
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