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Preparation method of CaSrNaA for adsorbing carbon dioxide under low pressure

A technology for adsorbing carbon dioxide and carbon dioxide, applied in chemical instruments and methods, separation methods, other chemical processes, etc., can solve the problem of not explaining the influence of calcium ion content, and achieve the effect of increasing the adsorption capacity

Pending Publication Date: 2021-12-24
ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Patent CN201811076483.8 A preparation method of high-performance TC-5A molecular sieve adsorbent. Through calcium ion exchange, TC-5A binder-free molecular sieve was developed. At 25°C and carbon dioxide partial pressure of 4torr, the carbon dioxide adsorption capacity can reach 6%, but did not elaborate on the effect of calcium ion content on carbon dioxide adsorption

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  • Preparation method of CaSrNaA for adsorbing carbon dioxide under low pressure
  • Preparation method of CaSrNaA for adsorbing carbon dioxide under low pressure
  • Preparation method of CaSrNaA for adsorbing carbon dioxide under low pressure

Examples

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Effect test

Embodiment 1

[0017] Example 1 Effect of Different Calcium Ion Exchange Degrees on Carbon Dioxide Adsorption by Molecular Sieves

[0018] Using 4A molecular sieve as raw material, calcium salt solution is used for ion exchange in aqueous solution. The adsorption capacity of carbon dioxide, the specific results are shown in Table 1.

[0019] Table 1 The effect of different calcium ion exchange degrees on the adsorption of carbon dioxide by molecular sieves under different pressures

[0020]

[0021] It can be seen from Table 1 that when the degree of calcium ion exchange is 0.7-0.9, the molecular sieve has the highest adsorption capacity for carbon dioxide under low pressure (2-6 torr). Excessively high calcium ion exchange degree will reduce the adsorption capacity of carbon dioxide.

Embodiment 2

[0022] Example 2 Effects of different degrees of strontium ion exchange on the adsorption of carbon dioxide by molecular sieves

[0023] Using 4A molecular sieve as the raw material, the strontium salt solution is used for ion exchange in the aqueous solution. The adsorption capacity of carbon dioxide, the specific results are shown in Table 2.

[0024] Table 2 The effect of different strontium ion exchange degrees on the adsorption of carbon dioxide by molecular sieves under different pressures

[0025]

[0026] It can be seen from Table 2 that when the degree of strontium ion exchange is 0.7-0.8, the molecular sieve has the highest adsorption capacity for carbon dioxide under low pressure (2-6 torr). Excessively high strontium ion exchange degree will reduce the adsorption capacity of carbon dioxide.

Embodiment 3

[0027] Example 3 Effects of different degrees of calcium and strontium ion exchange on the adsorption of carbon dioxide by molecular sieves

[0028] Using 4A molecular sieve as raw material, calcium salt and strontium salt solution are used for ion exchange in aqueous solution. The specific ion exchange degree is shown in Table 3. Then, an adsorption instrument is used to test the carbon dioxide adsorption capacity of the sample under low carbon dioxide pressure (2-6 torr). The specific results are shown in Table 3.

[0029] Table 3 Effects of different exchange degrees of calcium ions and strontium ions on the adsorption of carbon dioxide by molecular sieves under different pressures

[0030]

[0031] It can be seen from Table 3 that the adsorption capacity of molecular sieves for carbon dioxide under low pressure (2-6 torr) can be increased by using calcium ions and strontium ions to exchange molecular sieve samples. Higher calcium-strontium exchange degree and lower sod...

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Abstract

The invention discloses a preparation method of CaSrNaA for adsorbing carbon dioxide under low pressure. A 4A molecular sieve is mainly used as a raw material, and the ion exchange degree of a Cax / 2Sry / 2NazA molecular sieve meets the following requirements through ion exchange of pure calcium ions, pure strontium ions or calcium and strontium ions: (1) during pure calcium ion exchange (y=0), the calcium ion exchange degree x is 0.7-0.9, and x+z=1; (2) during pure strontium ion exchange (x=0), the strontium ion exchange degree y is 0.4-0.8, and y+z=1; and (3) during calcium-strontium ion exchange (x>0, y>=0.4), 0.7<=x+y<=0.8, and x+y+z=1. The carbon dioxide adsorption capacity of the optimal molecular sieve can reach 10.0-13.4 wt% under the conditions of the temperature of 25 DEG C and the carbon dioxide low pressure (2-6 torr).

Description

technical field [0001] The patent of the present invention relates to a preparation method of CaSrNaA molecular sieve that absorbs carbon dioxide under low partial pressure (the partial pressure of carbon dioxide is 2-6 torr), and belongs to the field of inorganic adsorption materials. Background technique [0002] When the carbon dioxide content in the air exceeds a certain concentration and reaches a certain period of time, it will endanger the comfort and health of the human body. When humans live in an air environment with a carbon dioxide concentration of less than 8000ppm for a medium and long term, no significant changes have been found. The average pore size of 4A molecular sieve is 0.4nm. After exchanged by calcium, strontium and other metal cations, the number and position of cations in the space frame are different, resulting in different attraction and pore size. When adsorbing under a high (250mm Hg) partial pressure of carbon dioxide, the static equilibrium ad...

Claims

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Application Information

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IPC IPC(8): B01J20/18B01J20/30B01D53/02
CPCB01J20/186B01J20/3085B01D53/02B01D2257/504Y02C20/40
Inventor 王洪亮胡宏杰张震张勇平刘红召金梅王威曹耀华张博柳林
Owner ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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