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Rare-earth modified molecular-sieve dehumidification adsorbent paper sheet and preparation method thereof

A technology of rare earth modification and molecular sieve, which is applied in separation methods, chemical instruments and methods, and other chemical processes. It can solve problems such as small pore size, large heat energy consumption, and difficult desorption, so as to improve service life and save energy.

Inactive Publication Date: 2011-02-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its small pore size (several A°) and strong capillary action on water molecules, its desorption is very difficult when the adsorption is saturated. Usually, its regeneration (desorption) temperature is above 250°C, which consumes a lot of heat energy

Method used

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  • Rare-earth modified molecular-sieve dehumidification adsorbent paper sheet and preparation method thereof
  • Rare-earth modified molecular-sieve dehumidification adsorbent paper sheet and preparation method thereof
  • Rare-earth modified molecular-sieve dehumidification adsorbent paper sheet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) At room temperature, in a 5L round plastic beaker, add 500mL of hydrochloric acid, then slowly add 0.5kg of lanthanum oxide, stir while adding, after the lanthanum oxide powder is completely dissolved, add 3L of distilled water to dilute, and dilute with 2mol L -1 Ammonia water is used to adjust the pH value to 5 to obtain an acidic rare earth lanthanum solution.

[0035] (2) In a 2L round plastic beaker, measure 1L of the above-mentioned acidic rare earth lanthanum solution, add 200g of 13X molecular sieve with an average particle size of 5 μm, heat up to 60°C, and ion exchange the molecular sieve with the rare earth ion under stirring. Filter the above suspension to obtain a filter cake, disperse it in a square porcelain basin and dry it for 2 hours, then air-dry it at 150°C for 4 hours to obtain a powder, transfer it to a ceramic crucible, and then place it in a programmed sintering furnace for activation. The sample is first rapidly (heating rate 15°C·min-1 , th...

Embodiment 2

[0038] (1) At room temperature, add 500mL of hydrochloric acid to a 5L round plastic beaker, then slowly add 0.5kg of lanthanum oxide, and stir while adding. After the neodymium oxide powder is completely dissolved, add 3L of distilled water to dilute, and use 1mol L -1 Ammonia water is used to adjust the pH value to 5 to obtain an acidic rare earth neodymium solution.

[0039] (2) In a 2L round plastic beaker, measure 1L of the above-mentioned acidic rare earth neodymium solution, add 200g of 13X molecular sieve with an average particle size of 5μm, heat up to 50°C, and ion exchange the molecular sieve with the rare earth ion under stirring. Filter the above suspension to obtain a filter cake, disperse it in a square porcelain basin and dry it for 2 hours, then air-dry it at 120°C for 4 hours to obtain a powder, transfer it to a ceramic crucible, and then place it in a programmed sintering furnace for activation. The sample was heated up rapidly to 400°C for 30 minutes, then ...

Embodiment 3

[0042] (1) At room temperature, in a 5L round plastic beaker, add 500mL of hydrochloric acid, then slowly add 0.5kg of cerium oxide, and stir while adding. After the cerium oxide powder is completely dissolved, add 3L of distilled water to dilute, and use 3mol·L -1 Ammonia water is used to adjust the pH value to 5 to obtain an acidic rare earth cerium solution.

[0043] (2) In a 2L round plastic beaker, measure 1L of the above-mentioned acidic rare earth cerium solution, add 200g of 13X molecular sieve with an average particle diameter of 5 μm, heat up to 70°C, and ion exchange the molecular sieve with the rare earth ion under stirring. Filter the above suspension to obtain a filter cake, disperse it in a square porcelain basin and dry it for 2 hours, then air-dry it at 170°C for 4 hours to obtain a powder, transfer it to a ceramic crucible, and then place it in a programmed sintering furnace for activation. The sample was heated up rapidly to 450°C for 30 minutes, and then sl...

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Abstract

The invention relates to a rare-earth modified molecular-sieve dehumidification adsorbent paper sheet and a preparation method thereof. The preparation method comprises the following steps: soaking the powder molecular sieve in a solution containing acidic rare earth, carrying out ion exchange, filtering, drying and roasting to obtain the rare-earth modified molecular sieve; and dispersing the rare-earth modified molecular sieve in silicasol under the action of ultrasound to obtain a suspension, soaking ceramic fiber paper in the suspension, taking out after the ceramic fiber paper is completely moistened, airing and drying to obtain the rare-earth modified molecular-sieve dehumidification adsorbent paper sheet. The modified molecular-sieve paper sheet has the advantages of high adsorption capacity and low regeneration temperature, can be processed into honeycomb, and is suitable for adsorption-type rotating wheel dehumidification and heat recovery under the environmental conditions of different humidities and / or different temperatures.

Description

technical field [0001] The invention relates to a molecular sieve adsorbent, in particular to a preparation method of a paper sheet of a rare earth modified dehumidification adsorbent, which belongs to gas adsorption drying purification and heat recovery technology Background technique [0002] The honeycomb block adsorbent constructed by the organic combination of ceramic fiber paper and dehumidification adsorbent can be used as a dehumidification rotor and applied to adsorption dehumidification wheels and total heat recovery systems. Adsorbents used as dehumidification cores mainly include silica gel, molecular sieves, etc. Silica gel has a good adsorption capacity, and the regeneration temperature is low (150°C). Its disadvantage is that the adsorption capacity is small at low humidity or high temperature; molecular sieves have uniform micropore distribution, large specific surface area, highly polarized inner surface, There is a strong electrostatic field in the crystal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/28B01J20/18B01J20/30B01J20/28
Inventor 方玉堂郭敬花李大艳高学农
Owner SOUTH CHINA UNIV OF TECH
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