The principle and characteristics of adsorption dryers, explained by an adsorption dryer parts manufacturer
Adsorption dryer parts The manufacturer believes that adsorption refers to the action of various gases, vapors, and solutes in a solution being adsorbed onto the surface of a solid or liquid substance. The adsorbable substance is called the adsorbent, and the adsorbed substance is called the adsorbate. Adsorption can be divided into physical adsorption and chemical adsorption.
The adsorption dryer parts manufacturer believes that all things have the ability to adsorb molecules, atoms, or ions of the surrounding medium onto their own surfaces to varying degrees. From a thermodynamic point of view, the reason why a solid surface can absorb other media is because the solid surface has excess energy—physically called "surface free enthalpy"—and has a tendency to absorb other substances to reduce its own surface energy.
The adsorption dryer parts manufacturer believes that physical adsorption is driven by intermolecular forces, with less adsorption heat. For example, the adsorption of many gases by activated carbon belongs to this category, and the adsorbed gas can be easily released without changing its properties. Therefore, physical adsorption is a reversible process. The adsorption process of the compressed air adsorption dryer that we are learning is physical adsorption.
Adsorption dryer parts The manufacturer believes that chemical adsorption involves attraction through forces similar to chemical bonds, with high adsorption heat. For example, the adsorption of many catalysts to gases, such as the adsorption of nickel to hydrogen (H2), belongs to this category. The adsorbed gas often needs to be released at very high temperatures, and its properties will change. Therefore, chemical adsorption is mostly an irreversible process. The same substance can undergo physical adsorption at low temperatures and chemical adsorption at high temperatures, or both simultaneously.
The adsorption dryer parts manufacturer believes that common adsorbents include activated carbon, silica gel, activated alumina, diatomaceous earth, etc. Many precipitates are produced in electrolyte solutions, such as aluminum hydroxide, iron hydroxide, silver chloride, etc., which also have adsorption capacity, and they can adsorb many ions in electrolyte solutions.
Adsorption performance depends on the nature of the adsorbent, the specific surface area of the adsorbent, the nature and concentration of the adsorbate, and the temperature. Since adsorption occurs on the surface of an object, the larger the specific surface area of the adsorbent, the stronger the adsorption capacity.
The adsorption dryer parts manufacturer believes that the adsorption of activated carbon is physical adsorption. Its huge specific surface area and complex pore structure result in an even larger specific surface area, thus possessing strong adsorption capacity. For some adsorbents, when the adsorbate concentration and pressure are constant, the higher the temperature, the weaker the adsorption capacity, so low temperature is favorable for adsorption. When the temperature is constant, the higher the concentration and pressure of the adsorbate, the stronger the adsorption capacity.
Adsorption dryer parts The manufacturer believes that physical adsorption has the following characteristics:
1. Solids adsorb surrounding gas molecules through "van der Waals forces." There is no transfer of electrons or formation and destruction of chemical bonds during the adsorption process. The attraction is small, so the adsorbed molecules are easily desorbed from the solid surface;
2. All adsorption processes are exothermic reactions. The "adsorption heat" released in physical adsorption is small due to the small van der Waals force;
3. The speed of physical adsorption is fast. Once the "adsorbate" and "adsorbent" come into contact, they will be adsorbed, and "adsorption equilibrium" is easily reached;
4. The adsorption dryer parts manufacturer believes that physical adsorption is a physical phenomenon caused by intermolecular forces and has no selectivity. That is, any solid can adsorb any gas, only differing in the amount of adsorption;
5. Physical adsorption is related to agglomeration and only occurs at or below the boiling point of the adsorbed substance.
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