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Adsorbent for low-concentration ethane separation and preparation thereof

An adsorbent, low-concentration technology, used in adsorption purification/separation, chemical instruments and methods, other chemical processes, etc., can solve the problems of low adsorption capacity, reduced adsorption selectivity, limited application range, etc., and achieves low desorption temperature. Effect

Inactive Publication Date: 2008-06-25
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods have problems such as high ethylene desorption temperature or low adsorption capacity. In addition, when the adsorbent contains Cu(I), the adsorption selectivity of ethylene and carbon monoxide is significantly reduced, and its application range is limited.

Method used

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  • Adsorbent for low-concentration ethane separation and preparation thereof
  • Adsorbent for low-concentration ethane separation and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The specific surface area of ​​20g is 15m 2 / g of 4A molecular sieve was added to 250ml of CaCl containing 0.5mol / L at room temperature 2 In the aqueous solution, stir and reflux at 80°C for 4h. Filter, wash with deionized water three times, and dry the obtained precipitate at 120°C for 12h, then place it in a muffle furnace and bake at 350°C for 3h. The Ca content of the final adsorbent is 20%, and XRD test analysis shows that its structure is Ca-A molecular sieve. After tableting and sieving, take 10g of adsorbent with 20-40 meshes, figure 1 The gas is adsorbed, and the ethylene adsorption capacity of 2.0mmol / g and the carbon monoxide adsorption capacity of 0.2mmol / g can be obtained.

Embodiment 2

[0031] The specific surface area of ​​20g is 410m 2 / g of 13X molecular sieve was added to 250ml of CaCl containing 0.5mol / L at room temperature 2 In the aqueous solution, stir and reflux at 85°C for 3h. Filter, wash with deionized water three times, and dry the obtained precipitate at 120°C for 12h, then place it in a muffle furnace and bake at 380°C for 3h. The Ca content of the final adsorbent is 15%. After tableting and sieving, 10 g of the adsorbent of 20 to 40 meshes is taken, and the figure 1 The gas is adsorbed, and the ethylene adsorption capacity of 3.0mmol / g and the carbon monoxide adsorption capacity of 0.4mmol / g can be obtained.

Embodiment 3

[0033] The specific surface area of ​​20g is 330m 2 / g of 4A molecular sieve was added to 300ml of Ba(NO 3 ) 2 In the aqueous solution, stir and reflux at 90°C for 2h. Filter, wash with deionized water three times, and dry the obtained precipitate at 120°C for 12h, then place it in a muffle furnace and bake at 400°C for 2h. The final Ba content of the adsorbent is 15%. After tableting and sieving, 10 g of the adsorbent of 20 to 40 meshes is taken, and the adsorbent is prepared under normal pressure and room temperature with an attached figure 1 The gas is adsorbed, and the ethylene adsorption capacity of 2.8mmol / g and the carbon monoxide adsorption capacity of 0.3mmol / g can be obtained.

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Abstract

The invention discloses an absorbent for ethylene efficiently separated from the gas with a light concentration of ethylene and a preparation method thereof. The absorbent is one or two metals supported on a molecular sieve and the composition of the absorbent is expressed by M-Z; Z symbolizes the molecular sieve and M is one or two selected from Ca, Ba, Sr, Ni, Co and Cu, and the weight percentage of M ranges from 10 per cent to 25 per cent; the absorbent possesses a high absorption capacity selectivity over the ethylene and the absorption capacity of the ethylene is higher than 3mmol / g under the suitable absorption conditions; the desorption temperature of the absorbent is low and the concentration of the ethylene in the desorption gas is high and the absorbent is suitable for the transformation absorption experiment equipment and is easy to be industrialized.

Description

technical field [0001] The invention relates to an adsorbent for efficiently separating ethylene from gas containing low-concentration ethylene and a preparation method thereof. Background technique [0002] Ethylene is the most important chemical raw material in the field of petrochemical industry, and it is usually produced by cracking naphtha in industry. As the price of crude oil continues to rise, its manufacturing cost gradually increases, and the efficient recovery and utilization of low-concentration ethylene has become a concern of people. At present, 5-20% ethylene is contained in the catalytic cracking dry gas of the refinery. Due to the small scale and dispersion of this part of raw materials, they are basically burned as fuel gas, resulting in a waste of resources. Although mature low-temperature or high-pressure distillation separation technology can obtain polymer grade ethylene, the production energy consumption is high and the investment scale is large. Ot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/13C07C11/04B01J20/18
Inventor 宋焕玲丑凌军杨建赵军张兵李树本王晓来
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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