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Decarbonating gas streams using zeolite adsorbents

A kind of adsorbent, zeolite technology, applied in the field of air purification

Inactive Publication Date: 2001-04-25
ARKEMA FRANCE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it can also be seen that when the degree of exchange reaches about 90%, the efficiency starts to plateau, so that there is no more obvious advantage when the exchange rate exceeds 95%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0045] The adsorbent used was a pellet obtained from the LSX powder described above.

[0046] 42.5 grams of LSX powder (expressed as calcined equivalent), 7.5 grams of fibrous clay (expressed as calcined equivalent), 1 gram of carboxymethylcellulose and sufficient water were mixed together and extruded to a diameter of 1.6 mm , Extrusions of length 4mm. The extrudates were dried at 80°C and then calcined at 550°C for 2 hours under an inert atmosphere.

[0047] Table 1 shows at 25°C and different CO 2 Under pressure, the measured CO 2 Adsorption capacity (cm 3 / g). It clearly shows that NaLSX sorbent with high sodium exchange is valuable for decarbonation at low partial pressure.

[0048] sodium exchange degree pressure 2mbar 5mbar 10mbar 94．5％ 25 37．2 45．5 97．5％ 29．2 40．3 47．8 99．5％ 32．5 42 49

[0049] From the capacity it is clear that the capacity at low pressure increases more than the capacity at high pressure.

example 2

[0051] The particulate (zeolitic) adsorbent used was obtained from the above-mentioned boiling LSX powder.

[0052] The zeolite LSX powder of Example 1 was used by agglomeration with a mixture of montmorillonite clay (15%), kaolin clay (85%), a small amount of carboxymethylcellulose and water. After extrusion, it was dried at 80°C in an inert atmosphere without water vapor, and calcined at 500°C for 2 hours.

[0053] Soak 10 g of agglomerates in 17 ml of sodium hydroxide solution with a concentration of 220 g / l at 95°C for 3 hours. Then soak the agglomerate in water at a ratio of 20ml / g, and wash four times successively.

[0054] The toluene adsorption capacity was measured under the above conditions, and its values ​​were as follows:

[0055] Agglomerated LSX (untreated) 20.2%

[0056] Agglomerated LSX (treated with NaOH) 22.4%

[0057] This toluene adsorption capacity reflects the fact that the adsorbed material is composed of more than 95% zeolite. These results show t...

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Abstract

The invention concerns a method for decarbonating gas streams polluted by CO2, which consists in contacting them with an adsorbent consisting of an agglomerate of zeolite X with a Si / Al ratio of 1 to 1.15, highly sodium-exchanged comprising not more than 20 % of inert binding material, to eliminate at least the carbon dioxide.

Description

technical field [0001] The present invention relates to the purification of gas streams contaminated with carbon dioxide, particularly in the presence of N 2 / O 2 Air purification before separation. Background technique [0002] Production of pure gases, especially N from the atmosphere 2 and O 2 , is a large-scale industrial operation, either using low temperature treatment, or using adsorption treatment based on the principle of pressure swing adsorption (PSA), based on temperature swing adsorption (PTA), or a combination of the two (PTSA). Also, many gases obtained from industrial processes contain large amounts of carbon dioxide and are often worth purifying. [0003] Production of N from air 2 and O 2 , requiring purification prior to the actual separation, because water or carbon dioxide present in the supply air can cause clogging of equipment when cryogenic processing is performed, since the operating temperature is far below the freezing temperature of these i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/02B01D53/04B01D53/047B01J20/18C01B39/22
CPCB01D2253/1085B01D2257/504Y02C10/08B01D2256/24B01D2253/108B01J20/183B01D2257/80B01D53/047B01D53/04Y02C20/40
Inventor D·普列
Owner ARKEMA FRANCE SA