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# Breakthrough Curve of Adsorber——Adsorption Principle of Carbon Molecular Sieve

The so-called breakthrough curve is the change curve of the concentration of adsorbed substance (i.e. adsorbate, in this experiment, oxygen) in the outlet fluid with time.

(Breakthrough curve of constant temperature fixed bed adsorber)

The typical breakthrough curve is shown in the figure above. It can be seen from the figure that the change of adsorbent concentration at the outlet presents an S-shaped curve. Before the lower inflection point (point a) of the curve, the concentration of adsorbent is basically unchanged (controlled below the required concentration). At this time, the export product is qualified.

After crossing the lower inflection point, the concentration of adsorbate increases with time. When it reaches the upper inflection point (point b), it tends to the inlet concentration. At this time, the bed has become saturated. Generally, the lower inflection point (point a) is called the breakthrough point, and the upper inflection point (point b) is called the saturation point. Generally, the point where the outlet concentration of adsorbate reaches 95% of the inlet concentration is determined as the saturation point, while the concentration of breakthrough point should be determined according to the product quality requirements, which is generally slightly higher than the target value.

The concentration of N_{2} is required to be more than or equal to 95%, that is, the outlet O_{2} should be less than or equal to 5%. Therefore, the penetration point should be set as O_{2}, and the outlet concentration should be 4.5% - 5.0%. In
order to ensure the product quality, the effective working area of the
adsorber should be controlled before the breakthrough point in the
actual production. Therefore, the determination of the breakthrough
point (point a) is an important content of the adsorption process
research.

The time corresponding to the breakthrough point (t_{0})
can be used to determine the optimal adsorption operation time of the
adsorption device and the dynamic adsorption capacity of the adsorbent,
and the dynamic adsorption capacity is an important basis for the design
and scale-up of the adsorption device. Dynamic adsorption capacity is
defined as the adsorption capacity of adsorbent per unit weight (i.e.
mass of adsorbent / mass or volume of adsorbent) from the beginning of
adsorption to the breakthrough point. (point a)

Dynamic adsorption capacity G = __ V*____t___{0}__*(C___{0}__-C___{B}__)__

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The above are some basic adsorption principles of carbon molekul sieve, which will be involved in the production process of our factory. If you are interested in our carbon molecular sieves, Biko kpọtụrụ anyị!