Method for preparing coal-based activated carbon with high adsorption capacity by using low temperature and low mesopore pore volume

Abstract

The invention relates to a method for preparing coal-based activated carbon with high adsorption capacity by using low temperature and low mesopore pore volume. The method comprise the following concrete steps that (1) coal-based carbonized materials are put into a EDTMPS solution with the mass percent being 10 to 40 percent to be soaked for 8 to 10h; (2) materials obtained in the step (1) are putinto a carbonization furnace to be activated for 40 to 60 minutes at the temperature of 400 to 500 DEG C; (3) the activated materials are discharged out of the furnace and are cooled to room temperature; the cooled materials are put into an auxiliary agent solution with the mass percent being 5 percent to be soaked for 30 to 40 minutes; (4) the auxiliary agent solution is discharged; the activated materials are flushed by water until the PH value is neutral; (5) the activated materials are dried at 150 to 200 DEG C to reach the required moisture; a mesopore developed activated carbon finishedproduct is obtained. The method has the advantages that the activation temperature is reduced to 400 to 500 DEG C from the original 900 DEG C; energy sources are saved; under the condition that the total pore volume of the activated carbon is not reduced, the mesopore pore volume proportion is increased to 20 to 40 percent from the original 10 percent.

Description

technical field

[0001] The invention relates to a method for preparing activated carbon, in particular to a method for preparing coal-based activated carbon with high adsorption capacity by applying low temperature and low mesopore volume. Background technique

[0002] The production of coal-based activated carbon is mostly prepared by steam activation method at a high temperature of 900-1000 degrees. The product has developed micropores and high strength. With the development of industry, the number of adsorbed elements increases, such as the removal of anthracene and naphthalene in coal gas and natural gas, desulfurization of blast furnace tail gas, etc., all require activated carbon with well-developed mesopores. Woody activated carbon has well-developed mesopores and good adsorption effect, but the strength after molding is insufficient, the service life is short, and the cost is high, while the coal-based activated carbon produced by conventional methods has less mesopo...