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Regeneration of the adsorbent

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Regeneration of the adsorbent

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[Abstract]:
Adsorption capacity of the adsorbent is limited, at 1% to 40% (by mass) between. To increase the processing capacity of the adsorption device, the adsorbent is generally recycled, both when the adsorbent is saturated or nearly saturated, making it into the desorption and regeneration operations, re-absorption into operation after regeneration.

Adsorption capacity of the adsorbent is limited, at 1% to 40% (by mass) between. To increase the processing capacity of the adsorption device, the adsorbent is generally recycled, both when the adsorbent is saturated or nearly saturated, making it into the desorption and regeneration operations, re-absorption into operation after regeneration. Commonly used methods are as follows desorption regeneration. (1) Desorption: The sorption capacity of the sorbent waiting pressure decreases with increasing temperature characteristics, with the elevated temperature of the adsorbent ways to make adsorbate desorption, allowing the adsorbent to regeneration method called for the desorption. Choose some desorption temperature, can adsorbate desorption relatively safe, achieve lower residual load. But to strictly control the bed temperature to prevent adsorbent inactivation or crystal structure was destroyed. Desorption stage of adsorbent bed heating methods can be used superheated steam method, the flue gas method, induction heating and microwave heating. (2) Buck desorption: The sorption capacity of the adsorbent under isothermal decreased with reduced pressure characteristics, with reduced pressure or vacuum so adsorbate desorbing method, whereby the adsorbent is regenerated method called buck desorption. Adsorbent for certain purposes, the greater the pressure change, the more complete adsorption and desorption mass. But to strictly control the pressure of the system changes in order to reduce power consumption and avoid the relative movement of adsorbent particles. (3) Replacement desorption: according to different desorbent materials having different adsorption capacity of this feature, at constant temperature and constant pressure, the saturated adsorbent bed fluid can be passed through the adsorption of the adsorbed displace the original substance, so that the adsorbate desorption method called desorption replacement. This method is particularly suitable for heat sensitive qualitative strong adsorption, desorption efficiency is high, enabling the residual load of the adsorbent is low. Common water vapor in the gas purification do displacing agent, often used in liquid adsorption of water and organic solvent as the displacer. As a result of this method, both the original adsorption desorption product quality, but also displacing agent, so after processing must be separated. In order to achieve the ideal of separation, the boiling point of the displacer and adsorbate between the components to be quite different. (4) purge desorption: gas (e.g., inert gas) purging the adsorbent bed to reduce the partial pressure of the adsorbate phase which can not be absorbed, so the method is called a purge gas desulfurization adsorbate desorption. An adsorption of large amounts of water and silicone, can pass into the dry nitrogen purging to make silicone extrusion moisture regenerated. (5) The chemical conversion regeneration: Sometimes the material may be adsorbed chemical reaction, so that it can not easily be adsorbed to generate a new substance desorbed. As organic matter adsorbed on the activated carbon, steam and air mixture can be oxidized to it, so that it generates CO2, in order to achieve the purpose of desorption regeneration. In addition, there are some other adsorbent desorption regeneration methods, such as electrolytic oxidation regeneration, regeneration and drug microbial regeneration. As for the method of operation adopted in the end what the industry, as the case may choose both economical and effective method. Actual production, often in combination with several methods