Molecular sieve modification method capable of increasing separation factor of CH4 and N2

A separation factor and molecular sieve technology, applied in the field of molecular sieve, can solve the problems of little change in separation coefficient and no adsorption, and achieve the effect of improving separation factor and improving adsorption capacity.

Inactive Publication Date: 2011-10-19
BEIJING UNIV OF TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the problem that still exists after most molecular sieves are modified is the CH 4 and N 2 The adsorption of both has "isotropy", that is, it is enhanced or weakened at the same time, and the separation coefficient of the two has little change. 4 Adsorption of gas molecules is not significantly selective

Method used

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  • Molecular sieve modification method capable of increasing separation factor of CH4 and N2
  • Molecular sieve modification method capable of increasing separation factor of CH4 and N2
  • Molecular sieve modification method capable of increasing separation factor of CH4 and N2

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Embodiment 1

[0024] Embodiment 1: 1g Naβ type molecular sieve is impregnated in 15ml (3M) H 2 SO 4 In the aqueous solution, stir evenly, let stand for 1 hour, filter, dry at room temperature for 24 hours, and dry at 100°C for 12 hours. After grinding, burn at a constant temperature of 500°C for 4 hours in an air atmosphere to obtain 4 2- / H-Naβ molecular sieve. In the pressure range of 330-1140mmHg, before acid modification, CH 4 and N 2 The separation factor is 1.63, H 2 SO 4 After modification, CH 4 and N 2 The separation factor increased to 2.04, 25% higher than before modification.

Embodiment 2

[0025] Embodiment 2: According to embodiment 1, 1g Naβ type molecular sieve is impregnated in H 3 BO 3 In a saturated aqueous solution, stir evenly, let stand for 1 hour, filter, dry at room temperature for 24 hours, and dry at 100°C for 12 hours. After grinding, burn at a constant temperature of 500°C for 4 hours in an air atmosphere to obtain HBO 3 - / H-Naβ molecular sieve. In the pressure range of 330 ~ 1140mmHg, CH 4 and N 2 The separation factor is 2.66, which is 63% higher than that before modification.

Embodiment 3

[0026]Embodiment 3: according to embodiment 1, 1g Naβ type molecular sieve is impregnated in 15ml (3M) NH 4 NO 3 In the aqueous solution, stir evenly, let stand for 1 hour, filter, dry at room temperature for 24 hours, and dry at 100°C for 12 hours. After grinding, burn at a constant temperature of 500°C for 4 hours in an air atmosphere to obtain + / H-Naβ molecular sieve. In the pressure range of 330 ~ 1140mmHg, CH 4 and N 2 The separation factor is 2.26, which is 38% higher than that before modification.

[0027] The XRD patterns of Naβ-type molecular sieves and acid-modified molecular sieves are shown in figure 1 , wherein curve (a) Naβ type molecular sieve; (b) Example 1 SO 4 2- / H-Naβ type molecular sieve; Curve (c) embodiment 2 HBO 3 - / H-Naβ type molecular sieve; Curve (d) embodiment 3H + / H-Naβ molecular sieve.

[0028] The pressure swing adsorption curves of methane on Naβ molecular sieves and acid-modified molecular sieves are shown in figure 2 , the exper...

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Abstract

The invention discloses a molecular sieve modification method capable of increasing a separation factor of CH4 and N2, belonging to the technical field of molecular sieve. The molecular sieve modification method comprises the following steps of: impregnating a Na-beta molecular sieve in H2SO4, H3BO3 and NH4NO3 aqueous solution with a certain concentration, filtering, drying and burning to obtain an acid-modified A/H-Na-beta molecular sieve. Compared with the Na-beta molecular sieve, the A/H-Na-beta molecular sieve provided by the invention has excellent adsorption selectivity to CH4 gas and prominent separation effect on CH4 and N2, wherein the NH4NO3-modified beta molecular sieve has the strongest adsorption capability to CH4 gas. The modified molecular sieve can simultaneously improve the adsorption capability to CH4 gas and reduce the adsorption capacity to N2, thus increasing the separation factor of CH4 and N2 and achieving the separation and enrichment of CH4 and N2.

Description

technical field [0001] The invention belongs to the technical field of molecular sieves, and relates to a method for increasing CH 4 and N 2 The molecular sieve modification method of the separation factor, specifically, the use of acids or acid salts of different strengths to modify the Naβ-type molecular sieve and its effect on CH 4 and N 2 Separation and enrichment of two gases. Background technique [0002] CH 4 is second only to CO 2 The important greenhouse gases that are emitted into the atmosphere and cause climate anomalies and damage to the ozone layer have become a major problem facing the world. Coal mine exhaust gas is the largest source of industrial methane emissions. However, due to the problems of large flow rate, low gas concentration, difficulty in methane enrichment and safety hazards in coal mine exhaust gas, it has become a major issue in China to collect and utilize coal mine exhaust gas to reduce greenhouse gas emissions. urgent tasks facing. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02
Inventor 戴洪兴石凤娟张磊邓积光刘雨溪赵振璇吉科猛王芳
Owner BEIJING UNIV OF TECH
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