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Lithium-type low-silica-alumina-ratio molecular sieve, preparation method and application of molecular sieve as adsorbent

A low-silicon-aluminum ratio, molecular sieve technology, applied in the direction of molecular sieves and alkali exchange compounds, chemical instruments and methods, crystalline aluminosilicate zeolites, etc., can solve the problems of high price, achieve high mechanical strength, uniform shape and size, The effect of increased mechanical strength

Pending Publication Date: 2022-01-28
启东海奥华环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, only a few manufacturers in China have the preparation technology of Li-LSX, and even fewer have a lithium ion exchange degree higher than 95%. This has led to the monopoly of high-quality Li-LSX imported from abroad, which is expensive in the domestic high-end market.

Method used

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  • Lithium-type low-silica-alumina-ratio molecular sieve, preparation method and application of molecular sieve as adsorbent

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Embodiment 1

[0017] 1) Preparation of alkaline solution a: Weigh KOH and NaOH solids with a mass ratio of 1:1, add distilled water, mix and stir until clear, and configure an aqueous solution with a mass fraction of 15% (the sum of KOH and NaOH) to obtain an alkaline solution a;

[0018] 2) Preparation of gel b: adding an aqueous aluminum hydroxide solution with a mass fraction of 15% to an aqueous sodium hydroxide solution with a mass fraction of 30%, stirring at 80°C until clear, and configuring a sodium metaaluminate solution as an aluminum source; Water glass is added to distilled water, stirred evenly at 30°C to prepare a silica-alumina gel with a mass fraction of 12% as a silicon source; under stirring conditions, add the alkaline solution a prepared in step 1) to the sodium metaaluminate solution, and wait to dissolve Then add silica-alumina gel under stirring, mix the two thoroughly, and age at 30°C for 16 hours to obtain gel b; the aluminum source is Al 2 o 3 In terms of silicon...

Embodiment 2

[0023] 1) Preparation of alkaline solution a: Weigh KOH and NaOH solids with a mass ratio of 1:1, add distilled water, mix and stir until clear, and configure an aqueous solution with a mass fraction of 15% (the sum of KOH and NaOH) to obtain an alkaline solution a;

[0024]2) Preparation of gel b: adding an aqueous solution of aluminum hydroxide with a mass fraction of 15% to an aqueous solution of sodium hydroxide with a mass ratio of 30%, stirring at 80° C. until clarification, and preparing a sodium metaaluminate solution as an aluminum source. Add water glass into distilled water, stir evenly at 30°C to prepare a silica-alumina gel with a mass fraction of 12% as a silicon source; Glue (SiO 2 / Al 2 o 3 =6.50, NaK / Si=3.0, H 2 O / NaK=18), the two are fully mixed, and aged at 30°C for 16 hours to obtain gel b; the aluminum source is Al 2 o 3 In terms of silicon source as SiO 2 Calculated, the molar ratio of silicon source to aluminum source in gel b is 6.5:1, the molar ...

Embodiment 3

[0029] 1) Preparation of alkaline solution a: Weigh KOH and NaOH solids with a mass ratio of 1:1, add distilled water, mix and stir until clear, and configure an aqueous solution with a mass fraction of 15% (the sum of KOH and NaOH) to obtain an alkaline solution a;

[0030] 2) Preparation of gel b: adding an aqueous aluminum hydroxide solution with a mass fraction of 15% to an aqueous sodium hydroxide solution with a mass fraction of 30%, stirring at 80°C until clear, and configuring a sodium metaaluminate solution as an aluminum source; Water glass is added to distilled water, stirred evenly at 30°C to prepare a silica-alumina gel with a mass fraction of 12% as a silicon source; under stirring conditions, add the alkaline solution a prepared in step 1) to the sodium metaaluminate solution, and wait to dissolve Then add silica-alumina gel under stirring, mix the two thoroughly, and age at 30°C for 16 hours to obtain gel b; the aluminum source is Al 2 o 3 In terms of silicon...

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Abstract

The invention belongs to the technical field of microporous materials, particularly relates to a lithium-type low-silica-alumina-ratio molecular sieve, a preparation method and application of the molecular sieve as an adsorbent, and belongs to the technical field of microporous materials. The preparation method comprises the following steps: firstly, preparing an alkaline solution, and then adding a sodium metaaluminate solution and silica-alumina gel into the alkaline solution to obtain gel; adding a sodium metaaluminate solution and silica-alumina gel, and conducting aging and drying to obtain molecular sieve raw powder; and carrying out Li<+> exchange on the molecular sieve raw powder by using a Li2SO4 aqueous solution, conducting mixing with kaolin, adding a heteroatom inorganic mineralizer, preparing spheres with uniform particle size by using a pelletizer, and conducting drying and roasting to obtain the lithium-type low-silica-alumina-ratio molecular sieve. The method is good in process repeatability and wide in applicable process conditions. And the product is high in quality, relatively uniform in shape and size and high in mechanical strength. The method for adding the inorganic mineralizer can be used for increasing the mechanical strength of molecular sieves in the forming process of other types of molecular sieves and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of microporous materials, and in particular relates to a lithium-type molecular sieve with a low silicon-to-aluminum ratio, a preparation method and its application as an adsorbent. Background technique [0002] With the development of industry, the demand for important gas industrial raw materials such as oxygen and nitrogen continues to increase. Among many industrial gas separation methods, vacuum pressure swing adsorption separation (VSA) and pressure swing adsorption separation (PSA) processes are flexible and convenient, low investment, low energy consumption, good performance, simple process flow, high degree of automation and easy operation. Convenience and other advantages have become more and more competitive. In recent years, it has been widely used in small and medium-scale industrial oxygen-enriched applications, and then expanded to industries such as wastewater treatment, paper industry, medic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/06C01B39/02B01J20/18B01J20/30
CPCC01B39/06C01B39/026B01J20/18
Inventor 娄悦彭宇马金鑫陶佳伟娄柏臣
Owner 启东海奥华环保科技有限公司
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