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Adsorbent module for efficiently denitrifying methane

An adsorbent and methane technology, which is applied in the fields of chemical material synthesis and mixed gas adsorption and separation engineering, can solve problems such as inability to meet production and life, and achieve the effects of reducing internal diffusion distance, high denitrification efficiency and solving environmental problems.

Active Publication Date: 2019-05-14
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Numerous scientific research institutes and companies have found that traditional adsorbents based on activated carbon, carbon molecular sieve, and zeolite molecular sieve can no longer meet the needs of production and life in the process of natural gas PSA decarburization and denitrification

Method used

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  • Adsorbent module for efficiently denitrifying methane

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Effect test

Embodiment 1

[0044] Taking the enrichment of low-concentration coalbed methane as an example, the present invention will be further described.

[0045] A combined adsorbent module constructed of structured adsorbents for efficient separation of methane, such as figure 1 shown. The adsorbent module mainly includes three types of adsorbent materials with different functions, which are water absorbing, carbon dioxide adsorbing and methane adsorbents. The assembly method is that along the airflow direction, the functions of the adsorbent are water absorption, carbon dioxide adsorption and methane adsorption in sequence.

[0046] Such as figure 1 As shown, the water-absorbing material is activated alumina, and the specific surface area is greater than 250m 2 / g γ-Al 2 o 3 .

[0047] The decarburized MOFs material is Al-BDC with a specific surface area greater than 600m 2 / g, the pore size distribution is between 0.5-2nm, and the separation factor of methane and carbon dioxide is 14.

[...

Embodiment 2

[0052] A combined adsorbent module constructed of structured adsorbents for efficient separation of methane, such as figure 1 shown. The adsorbent module mainly includes three types of adsorbent materials with different functions, which are water absorbing, carbon dioxide adsorbing and methane adsorbents. The assembly method is that along the airflow direction, the functions of the adsorbent are water absorption, carbon dioxide adsorption and methane adsorption in sequence.

[0053] The adsorption bed is used for CH 4 (25%), O 2 (10%), N 2 (57%), CO 2 (3%) with H 2 Separation of O (5%) mixed gas.

[0054] Such as figure 1 As shown, the water-absorbing material is activated alumina, and the specific surface area is greater than 250m 2 / g γ-Al 2 o 3 .

[0055] The decarburized MOFs material is Cu-BTC with a specific surface area greater than 900m 2 / g, the pore size distribution is between 0.5-8nm, and the separation factor of methane and carbon dioxide is 8.

[005...

Embodiment 3

[0060] A combined adsorbent module constructed of structured adsorbents for efficient separation of methane, such as figure 1shown. The adsorbent module mainly includes three types of adsorbent materials with different functions, which are water absorbing, carbon dioxide adsorbing and methane adsorbents. The assembly method is that along the airflow direction, the functions of the adsorbent are water absorption, carbon dioxide adsorption and methane adsorption in sequence.

[0061] The adsorption bed is used for CH 4 (53%), O 2 (10%), N 2 (22%), CO 2 (10%) with H 2 Separation of O (5%) mixed gas.

[0062] Such as figure 1 As shown, the water-absorbing material is activated alumina, and the specific surface area is greater than 250m 2 / g γ-Al 2 o 3 .

[0063] The decarbonized MOFs material is ZIF-8, with a specific surface area greater than 1400m 2 / g, the pore size distribution is between 0.5-0.8nm, and the separation factor of methane and carbon dioxide is 10.

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Abstract

The invention provides an adsorbent module for efficiently denitrifying methane. The adsorbent module is a composition adsorbent module constructed by adsorbents with regular structures. The adsorbentmodule with regular structures comprises the adsorbents in regular shapes, the hydraulic equivalent diameters of the adsorbents in the regular shapes are larger than 10 mm, the lengths of the adsorbents in the regular shapes are longer than 30 mm, and the internal diffusion distances of the adsorbents in the regular shapes are shorter than 0.3 mm; the diversified adsorbents are assembled to formthe adsorbent module with the regular structures and are sequentially overlaid according to the flow direction of raw gas in the sequence of dewatering adsorbents, CO2 adsorbents and methane / nitrogenadsorbents. The adsorbent module has the advantages that the adsorbent module is mainly used for efficiently adsorbing, concentrating and purifying the methane and is in regular structural designs, the internal diffusion distance of main gas flow of the adsorbent module on the adsorbents is shorter than 0.3 mm, the adsorbent module at least contains dewatering and decarburization adsorbents and denitrification adsorbents, the gas diffusion distance of the adsorbent module is shorter than 0.5 mm, and the adsorbent module is high in adsorption and diffusion speed and utilization rate.

Description

technical field [0001] The invention belongs to the technical field of chemical material synthesis and mixed gas adsorption and separation engineering, and in particular relates to an adsorbent module for efficient separation of methane. Background technique [0002] As the cleanest fossil energy recognized in the world, natural gas is playing an increasingly important role in the energy consumption structure of various countries. The national energy strategy proposes that by 2020, my country's natural gas consumption will account for more than 12% of energy consumption, increasing to 400 billion cubic meters. At present, the proportion of natural gas in my country's energy consumption is less than 6%, which is far from the goal of 12%. my country has huge reserves of unconventional natural gas, and the development of efficient utilization technologies for unconventional natural gas such as coalbed methane, shale gas, and biogas will play an important role in mitigating the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/047C10L3/10
CPCY02C20/40
Inventor 王树东孙天军赵生生
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI