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Monolithic composite porous carbon adsorption material for separating methane and nitrogen, and preparation method thereof

An adsorption material and methane separation technology, applied in the field of monolithic composite porous carbon adsorption material and its preparation, can solve the problems of low methane adsorption capacity, poor separation selectivity, complex preparation process, etc., achieve high adsorption capacity, increase adsorption capacity, The effect of simple preparation process

Active Publication Date: 2019-10-22
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an integral composite porous carbon adsorption material for separating methane and nitrogen and its preparation method in view of the shortcomings of existing carbonaceous adsorbents such as complex preparation process, low methane adsorption capacity, and poor separation selectivity.

Method used

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  • Monolithic composite porous carbon adsorption material for separating methane and nitrogen, and preparation method thereof
  • Monolithic composite porous carbon adsorption material for separating methane and nitrogen, and preparation method thereof
  • Monolithic composite porous carbon adsorption material for separating methane and nitrogen, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Weigh 0.5g lithium alginate, add it to 156mL deionized water, stir at room temperature until it dissolves evenly; then, weigh 9.0g resorcinol and add it to the above solution, stir until dissolved; measure 12mL of formaldehyde solution (37wt.%) was quickly added to the above solution, and after continuing to stir for a certain period of time; the above solution was poured into a quartz tube reactor, and transferred to a 90°C constant temperature oven for gel aging for 18 hours; after aging, the polymer was taken out and completely dried Save for later. Under the purging of argon atmosphere, the temperature was raised from room temperature to 800°C at a rate of 3°C / min. At this time, the argon atmosphere was switched to an activated carbon dioxide atmosphere, and activated for 1.5h to obtain a composite porous carbon (monolithic composite porous carbon carbon adsorbent). Such as figure 1 As shown, the nitrogen adsorption test results show that its BET specific surface ...

Embodiment 2

[0044] The polymer prepared in Example 1 was placed in a carbonization furnace, and the temperature was raised from room temperature to 800°C at a rate of 3°C / min. At this time, the argon atmosphere was switched to an activated carbon dioxide atmosphere and activated for 2 hours to obtain a composite porous carbon. Nitrogen adsorption test results show that its BET specific surface area is about 1060m 2 g -1 , the micropore volume is about 0.27cm 3 g -1 , the micropore size distribution is as figure 2 shown.

[0045] In order to test the separation performance of the monolithic composite porous carbon synthesized above for methane and nitrogen, its separation performance for methane and nitrogen was evaluated on a fixed bed device, and the separation conditions were as follows: test temperature 25°C; normal pressure; inert gas purge desorption The volume percentage of methane and nitrogen is 50%, and the total flow of methane and nitrogen is 12mL / min; product analysis ado...

Embodiment 3

[0047] The polymer prepared in Example 1 was placed in a carbonization furnace, and the temperature was raised from room temperature to 800°C at a rate of 3°C / min. At this time, the argon atmosphere was switched to an activated carbon dioxide atmosphere and activated for 3 hours to obtain a composite porous carbon. Nitrogen adsorption test results show that its BET specific surface area is about 1166m 2 g -1 , the micropore volume is about 0.30cm 3 g -1 , the micropore size distribution is as figure 2 shown.

[0048] In order to test the separation performance of the monolithic composite porous carbon synthesized above for methane and nitrogen, its separation performance for methane and nitrogen was evaluated on a fixed bed device, and the separation conditions were as follows: test temperature 25°C; normal pressure; inert gas purge desorption The volume percentage of methane and nitrogen is 50%, and the total flow of methane and nitrogen is 12mL / min; product analysis ado...

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Abstract

The invention provides a monolithic composite porous carbon adsorption material for separating methane and nitrogen, and a preparation method thereof, wherein the monolithic composite porous carbon adsorption material is a macropore-mesopore-micropore tandem composite porous carbon, the pore size range of the micropores is 0.50-1.20 nm, and the surface has polar sites and can be regulated. According to the present invention, the monolithic composite porous carbon adsorption material has a dynamic methane adsorption amount of up to 0.79 mmol.g<-1> at a normal temperature under a normal pressure, has methane / nitrogen separation selectivity of 16, has good industrial application prospect, and further has a multi-level pore channel structure, wherein the macropores and the mesopores facilitatecan easily achieve the diffusion of methane, and the micropores can easily increase the adsorption amount of methane; the method for regulating the surface chemical property and the pore structure ofthe adsorption materials is simple and easy to control, and provides the reference for the design of adsorbents for difficultly-separated mixed gases; and the adsorption material of the invention hasgood application effect in the field of methane and nitrogen separation, and provides the technical support for the concentration and purification of unconventional natural gases such as coalbed methane and the like.

Description

technical field [0001] The invention belongs to the technical field of gas separation, and in particular relates to an integral composite porous carbon adsorption material for separating methane and nitrogen and a preparation method thereof. Background technique [0002] As a high-quality gas fuel and a raw material for carbon-chemical products, methane has abundant reserves, high calorific value, and the highest H / C ratio in nature, and occupies an important position in the energy system. Petroleum, a cleaner energy, widely exists in biogas, shale gas, landfill gas, and coalbed methane. It has abundant reserves but low concentration and cannot be directly utilized. The main composition of low-concentration methane gas is CH 4 , CO 2 and N 2 , where CH 4 / N 2 Due to their similar kinetic diameters (0.380nm and 0.364nm) and extremely similar physical properties under supercritical conditions, they have become challenging problems in the field of separation. Currently, f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30B01D53/04
CPCB01D53/04B01D2256/10B01D2257/708B01J20/20
Inventor 陆安慧郭丽萍任占新
Owner DALIAN UNIV OF TECH
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