High-performance coconut shell activated carbon adsorbent for separating methane/nitrogen and preparation method of high-performance coconut shell activated carbon adsorbent

Abstract

The invention discloses a high-performance coconut shell activated carbon adsorbent for separating methane / nitrogen and a preparation method of the high-performance coconut shell activated carbon adsorbent. The preparation method comprises the following steps: performing primary carbonization on coconut shells; grinding the coconut shells subjected to the primary carbonization to obtain carbon powder; mixing the carbon powder with an adhesive and water, and performing extrusion forming, thus obtaining a raw material rod; performing secondary carbonization on the raw material rod to obtain a carbonized material; performing immersion modification and activation treatment on the carbonized material in sequence, thus obtaining the high-performance coconut shell activated carbon adsorbent. Theinvention provides a preparation method of fruit shell-based columnar activated carbon. Compared with conventional coconut shell broken carbon, the high-performance coconut shell activated carbon adsorbent has the advantages of regular shape, small pressure drop, high intensity and the like. As the air flow speed is extremely high during adsorption and separation, certain pressure is generated; furthermore, cyclic and repeated use is required, so that the columnar coconut shell activated carbon is more suitable for being used in a pressure swing adsorption process. Compared with a carbon molecular sieve which adopts phenolic resin, the high-performance coconut shell activated carbon adsorbent adopts coconut shells, so that a large number of raw materials can be obtained in Hainan of Chinaand Southeast Asia regions; the raw materials are wide in source and reasonable in prices, so that stable quality and reasonable price can be guaranteed more easily.

Description

technical field [0001] The invention relates to an activated carbon adsorbent for separating methane / nitrogen and a preparation method thereof, in particular to a high-performance coconut shell activated carbon adsorbent and a preparation method thereof, belonging to the field of comprehensive energy utilization. Background technique [0002] my country is rich in coalbed methane resources, but the degree of utilization is low, especially the low-concentration coalbed methane extracted underground, most of which are directly discharged into the atmosphere. Methane in coalbed methane is a high calorific value carbon energy, and the exhaustion directly causes huge energy Waste, and because methane is also a greenhouse gas with a significant greenhouse effect, its damage to the ozone layer is 21 times that of carbon dioxide. If a large amount of methane in coalbed methane cannot be recycled, it will accelerate global warming and seriously pollute the environment. Since 2011, the...

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Problems solved by technology

[0002] my country is rich in coalbed methane resources, but the degree of utilization is low, especially the low-concentration coalbed methane extracted underground, most of which are directly discharged into the atmosphere. Methane in coalbed methane is a high calorific value carbon energy, and the exhaustion directly causes huge energy Waste, and because methane is also a greenhouse gas with a significant greenhouse effect, its damage to the ozone layer is 21 times that of carbon dioxide. If a large amount of methane in coalbed methane cannot be recycled, it will accelerate global warming and seriously pollute the environment.

Since 2011, the state has encouraged the development of coalbed methane utilization technology and required coal mining enterprises to increase the extraction rate and utilization rate of coalbed methane. Application requirements, coalbed methane concentration technology is urgently needed to realize the enrichment of methane in low-concentration coalbed methane

The main component of coalbed methane is CH 4 , N 2 and O 2 , for the sake of safety, the existing process mostly removes O 2 Concentrate again, because CH 4 / N 2 The physical properties are very similar, and it is difficult to achieve separation with conventional adsorbents