How to evaluate the adsorption capacity of coal columnar activated carbon? Coal columnar activated carbon adsorption can be divided into two categories: liquid-phase adsorption and gas-phase adsorption. The liquid-phase adsorption capacity is often evaluated by adsorption isotherms, while the gas-phase adsorption capacity is evaluated by solvent vapor adsorption capacity.

The adsorption isotherm of coal columnar activated carbon represents the relationship between the partial pressure or concentration of the adsorbed substance in the adsorption system and the adsorption capacity at a certain temperature. That is, when the temperature is kept constant, the equilibrium adsorption capacity and the change in partial pressure or concentration can be measured. A relationship curve can be plotted with residual concentration as the horizontal axis and adsorption capacity of activated carbon per unit mass as the vertical axis.

When keeping the partial pressure or concentration constant, the relationship between the equilibrium adsorption capacity and temperature can be measured, and a relationship curve can be drawn, which is the adsorption isobaric line. Due to the fact that the adsorption of small amounts of components in industrial equipment generally occurs in an isothermal state, adsorption isotherms are the most important and commonly used.

The adsorption capacity of solvent vapor represents the gas-phase adsorption performance. For example, the determination of the carbon tetrachloride adsorption rate of granular activated carbon can be used. Under the specified experimental conditions, namely the height of the carbon layer, the specific velocity of the gas flow, the adsorption temperature, the cross-sectional area of the measuring tube, and the concentration of carbon tetrachloride vapor, a mixed air flow containing a certain concentration of carbon tetrachloride vapor is continuously passed through the activated carbon. When the adsorption saturation is reached, the percentage of the mass of carbon tetrachloride adsorbed by the activated carbon sample to the mass of the sample is taken as the adsorption rate of carbon tetrachloride.

In the application of coal based columnar activated carbon, it is best to evaluate and test the adsorption capacity using the actual proposed activated carbon, operating conditions, and specific treatment materials.

The adsorption capacity of coal columnar activated carbon, which refers to the amount of adsorbate adsorbed per unit of activated carbon, is also known as the activity of activated carbon in industry. There are two ways to express the activity:

Coal based columnar activated carbon - refers to the adsorption capacity of the adsorbent that reaches equilibrium.

Coal based columnar activated carbon refers to a fluid mixture passing through an activated carbon bed, where the adsorbate is adsorbed. After some time of operation, a certain amount of adsorbate begins to appear in the fluid flowing out of the activated carbon bed, indicating that the activated carbon bed has lost its adsorption capacity. At this point, the amount of adsorbate already adsorbed on the activated carbon is called its activity. It is the data required for designing a large, frequent, and important adsorption system.

The standard practical method for determining the adsorption capacity of activated carbon using the liquid isothermal line method can be used to determine the adsorption capacity of raw, reactivated, and powdered activated carbon.