A kind of adsorbent and its preparation method and application

A technology of adsorbent and molecular sieve, which is applied in the field of chemical materials, can solve problems such as difficult to meet the selective separation requirements of methane/nitrogen adsorption, and achieve the effects of high-efficiency adsorption and separation performance, reduced surface polarity, and reduced cost

Active Publication Date: 2021-06-22
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

The key factor affecting the separation of methane / nitrogen by PSA is the adsorbent. The adsorbents currently used are generally difficult to meet the selective separation requirements of methane / nitrogen.

Method used

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  • A kind of adsorbent and its preparation method and application
  • A kind of adsorbent and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] First, 10 g of FAU-type 13X molecular sieves were ion-exchanged with 400 ml of 1M zinc nitrate aqueous solution for 2 hours in a water bath at 60° C., washed and dried. The exchanged molecular sieve was reacted with 14 g of 2-methylimidazole at 60°C for 4 hours, washed with deionized water until neutral, and dried to obtain an adsorbent, marked as 1#. Under the conditions of 25°C and 100KPa, the CH of the obtained product 4 and N 2 The adsorption capacity is 5.42cm 3 / g and 1.47cm 3 / g, the equilibrium separation ratio of methane and nitrogen is 3.69.

Embodiment 2

[0056] First, 10 g of FAU-type Na-Y molecular sieves were ion-exchanged with 400 ml of a 1M copper chloride aqueous solution for 4 hours in a water bath at 60° C., washed and dried. The exchanged molecular sieves were reacted with 16 g of 2-ethylimidazole at 60°C for 4 hours, washed with deionized water until neutral, and dried to obtain an adsorbent, marked as 2#. Under the conditions of 25°C and 100KPa, the CH of the obtained product 4 and N 2 The adsorption capacity is 5.29cm 3 / g and 1.46cm 3 / g, the equilibrium separation ratio of methane and nitrogen is 3.62.

Embodiment 3

[0058] First, 10 g of MOR molecular sieves were ion-exchanged with 400 ml of a 1M indium nitrate aqueous solution for 8 hours in a water bath at 50° C., washed and dried. The exchanged molecular sieves were reacted with 18 g of 2-ethylimidazole at 60°C for 4 hours, washed with deionized water until neutral, and dried to obtain an adsorbent, marked as 3#. Under the conditions of 25°C and 100KPa, the CH of the obtained product 4 and N 2 The adsorption capacity is 10.04cm 3 / g and 2.56cm 3 / g, the equilibrium separation ratio of methane and nitrogen is 3.92.

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Abstract

The present application discloses an adsorbent and its preparation method and application. The adsorbent includes a modified molecular sieve modified by imidazole compounds; wherein, the modified molecular sieve is an ion-exchanged molecular sieve. The preparation method uses molecular sieves as raw materials, undergoes ion exchange, and then modifies the adsorbent with imidazole compounds. The adsorbent prepared by this application reduces the polarity of the surface of the molecular sieve skeleton, improves the selectivity of the adsorbent to methane, and has a methane / nitrogen separation ratio as high as 3.5 or more, reflecting efficient methane / nitrogen adsorption and separation performance, and can realize pressure swing adsorption. The effective separation of methane / nitrogen meets the requirements of industrial pressure swing adsorption separation of methane / nitrogen and reduces industrial operating costs.

Description

technical field [0001] The application relates to an adsorbent and its preparation method and application, belonging to the field of chemical materials. Background technique [0002] The separation of nitrogen from methane is of great significance for the widely used natural gas. Since the presence of nitrogen will reduce the calorific value of natural gas, natural gas containing a certain amount of nitrogen usually needs to increase the concentration to meet the requirements of minimum calorific value for pipeline transportation. Due to the small difference in the kinetic diameters of methane and nitrogen (CH 4 for N 2 for ), and both are non-polar molecules, methane has a high polarizability, and nitrogen has a dipole moment, making the separation of the two very difficult. The currently used methane and nitrogen separation technology is cryogenic distillation, but cryogenic distillation is very energy-intensive, and the cost of cryogenic liquefaction and recompressi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/22B01J20/30B01D53/047
CPCB01D53/047B01J20/186B01J20/22
Inventor 吴雅琪袁丹华陈兆安徐云鹏刘中民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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