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A method of separating methane and nitrogen

A technology for separating methane and nitrogen, which is applied in separation methods, chemical instruments and methods, methane capture, etc., can solve the problems of poor hydrothermal stability, high ligand price and high preparation cost, and achieves good water resistance and simple purification steps. , the effect of low synthesis cost

Active Publication Date: 2020-10-16
ZHEJIANG UNIV
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Problems solved by technology

[0005] However, the hydrothermal stability of most metal-organic framework materials is poor and the preparation cost is high, not only the price of the ligand is high, but also the reaction needs to be carried out in an organic solvent during the whole synthesis process, organic solvents such as N,N-dimethyl methyl formamide or N,N-dimethylacetamide, etc., and the subsequent purification process of the material produces a large amount of organic waste liquid

Method used

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  • A method of separating methane and nitrogen
  • A method of separating methane and nitrogen
  • A method of separating methane and nitrogen

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Mix 1.5mmol of zinc acetate dihydrate, 1.5mmol of 2,5-dihydroxy-1,4-benzoquinone, and 10mL of deionized water, put them into a 25mL hydrothermal reactor, and stir and react at room temperature for 12 hours. After the reaction is completed, the solid obtained from the reaction is centrifuged and washed several times with deionized water and ethanol to obtain a purified metal-organic framework material. The purified adsorbent was vacuum degassed at 100 °C for 12 h to obtain the desolvated adsorbent, followed by gas adsorption.

[0047] To test the adsorption-separation performance of the above-synthesized MOFs, a single-component adsorption isotherm of methane and nitrogen was carried out using the above-mentioned adsorbents. Take an appropriate amount of adsorbent, and the adsorption temperature is 0°C and 25°C. The adsorption isotherm curve is shown in the appendix figure 1 . After testing, at 0°C and 1 bar, the adsorption amount of methane is as high as 1.72mmol / g, ...

Embodiment 2

[0050] Mix 1.5mmol ferric chloride hexahydrate, 1.5mmol 2,5-dihydroxy-1,4-benzoquinone, and 10mL deionized water, put them into a 25mL hydrothermal reactor, and stir and react at room temperature for 12 hours. After the reaction is completed, the solid obtained from the reaction is centrifuged and washed several times with deionized water and ethanol to obtain a purified metal-organic framework material. The purified adsorbent was vacuum degassed at 100 °C for 12 h to obtain the desolvated adsorbent, followed by gas adsorption.

[0051] To test the adsorption-separation performance of the above-synthesized MOFs, a single-component adsorption isotherm of methane and nitrogen was carried out using the above-mentioned adsorbents. Take an appropriate amount of adsorbent, and the adsorption temperature is 0°C and 25°C. The adsorption isotherm curve is shown in the appendix figure 2 . After testing, at 0°C and 1bar, the adsorption capacity of methane is as high as 1.54mmol / g, an...

Embodiment 3

[0054] Mix 2 mmol of anhydrous manganese chloride, 1.5 mmol of 2,5-dihydroxy-1,4-benzoquinone, and 15 mL of deionized water, put them into a 25 mL hydrothermal reactor, and stir and react at room temperature for 12 hours. After the reaction is completed, the solid obtained from the reaction is centrifuged and washed several times with deionized water and ethanol to obtain a purified metal-organic framework material. The purified adsorbent was vacuum degassed at 100 °C for 12 h to obtain the desolvated adsorbent, followed by gas adsorption.

[0055] To test the adsorption-separation performance of the above-synthesized MOFs, a single-component adsorption isotherm of methane and nitrogen was carried out using the above-mentioned adsorbents. The adsorption isotherm curve is shown in the appendix image 3 . Take an appropriate amount of adsorbent, and the adsorption temperature is 0 degrees and 25 degrees. At 0°C and 1 bar, the adsorption amount of methane reaches 2.25mmol / g, a...

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Abstract

The invention discloses a method for separating methane and nitrogen gas. The method comprises the following steps: taking a metallic organic frame material as an adsorbing agent, and separating the methane and the nitrogen gas or purifying the methane from mixed gas, which contains the methane and the nitrogen gas, by adopting an adsorption and separation method; the structural general formula ofthe metallic organic frame material is [M(C6O4)].nH2O or [M2(C6O4)3].nH2O, in the formula, M is a metal ion, n is the number of water molecules, and the numerical value is 2-8. The metallic organic frame material has a three-dimensional network structure formed through coordination bonds or intermolecular force of transitional metal ions or alkaline-earth metal ions and organic ligands (2,5-dyhydroxyl-1,4-benzoquinone), wherein the water molecules coordinate with metal and have relatively strong hydrogen-bond interaction with oxygen atoms on the organic ligands. The organic ligands and metalsalt used for preparing the metal organic frame material utilized by the method provided by the invention are both cheap and easy to obtain, the synthetic conditions are mild, the purification steps are simple, and the operation and amplification are facilitated.

Description

technical field [0001] The invention relates to the technical field of adsorption materials and energy, in particular to a method for separating methane and nitrogen. Background technique [0002] As the main component of natural gas, methane is becoming a clean and cheap energy resource. Compared with traditional chemical fuels such as coal and petroleum, the amount of carbon dioxide released by methane is relatively small on the basis of the same unit of energy, which also reduces the greenhouse effect caused by the burning of fossil fuels to a certain extent. At present, methane is widely used in industry, commerce and residential life, and according to statistics, it accounts for 22% of the energy in the world. Methane can generally be obtained through many unconventional resources, such as coal bed methane, landfill gas, biological fermentation and other unconventional resources. However, the methane gas obtained from unconventional resources is often complex in compo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/02B01J20/22
CPCB01D53/02B01D2253/204B01D2256/10B01D2257/7025B01J20/226Y02C20/20
Inventor 鲍宗必李良英任其龙张治国杨亦文杨启炜
Owner ZHEJIANG UNIV
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