Preparation method of coal-based activated carbon for nitrogen/methane separation and prepared activated carbon

Abstract

The invention discloses a preparation method of coal-based activated carbon for nitrogen / methane separation and the prepared activated carbon. The preparation method comprises the following steps: taking anthracite as a raw material, and crushing; uniformly mixing the pulverized coal obtained by crushing with a binder, an activated catalyst and water to obtain a mixture; carrying out pressure molding on the obtained mixture, and naturally airing molded strips to cure the molded strips; putting the cured molded strips into a carbonization furnace, and carbonizing the molded strips under the condition of air isolation; putting the obtained carbonized material into an activating furnace, and performing activating by adopting carbon dioxide gas as an activating agent to obtain the coal-based activated carbon for nitrogen / methane separation. By selecting suitable coal types, improving the production process and simplifying the preparation process, the preparation process of the coal-based activated carbon for nitrogen / methane separation suitable for large-scale production is successfully researched, and the purpose of preparing a high-performance activated carbon adsorbent at low cost is achieved.

Description

technical field

[0001] The invention relates to the field of coal-based activated carbon, in particular to a coal-based activated carbon for nitrogen / methane separation and a preparation method thereof. Background technique

[0002] my country's coalbed methane, oilfield gas and landfill gas contain a large amount of CH4 gas, such as the volume fraction of CH4 in oilfield gas is about 70%-80%, the volume fraction of CH4 in landfill gas is about 60%, and the volume fraction of CH4 in coal mine gas The content of CH4 is relatively small, and the volume fraction is about 20%-50%. The utilization of these methane gases can effectively improve the energy structure and reduce greenhouse gas emissions. Because the physical properties of N2 and CH4 are similar, it is difficult to separate them by conventional physical methods. Pressure swing adsorption (PSA) technology uses the principle of kinetic effect or equilibrium effect. When the ratio of the equilibrium separation coefficien...