Adsorbents And Adsorptive Dryers

An adsorbent is a substance, usually porous in nature and with a high surface area that can adsorb substances onto its surface by intermolecular forces. Only at very low concentrations is the adsorption isotherm linear, at higher concentrations the adsorption isotherm may be langmuir or freundlich in nature. Due to the fact that solutes can distribute between the adsorbent surface and a mobile phase, adsorbents are used as a stationary phases in gas-solid and liquid-solid chromatography. Adsorbents are also used for extraction purposes removing traces of organic materials from large volumes of water very efficiently (cf solid phase extraction devices). Typical adsorbents used in gas-solid chromatography are silica gel, alumina and carbon.

These are mostly used in the separation of the permanent gases and the low molecular weight hydrocarbon gasses. Adsorbents used in liquid solid chromatography are mostly silica gel and various types of bonded phases. Adsorbents in liquid-solid chromatography have a very wide variety of application areas. Adsorbents are used usually in the form of spherical pellets, rods, moldings, or monoliths with hydrodynamic diameters between 0.5 and 10 mm. They must have high abrasion resistance, high thermal stability and small pore diameters, which results in higher exposed surface area and hence high surface capacity for adsorption. The adsorbents must also have a distinct pore structure which enables fast transport of the gaseous vapors. Most industrial adsorbents fall into one of three classes: oxygen-containing compounds - are typically hydrophilic and polar, including materials such as silica gel and zeolites. Carbon-based compounds - are typically hydrophobic and non-polar, including materials such as activated carbon and graphite. Polymer-based compounds - are polar or non-polar functional groups in a porous polymer matrix. Silica gel is the most important adsorbent and is widely used in industrial applications.

Adsorptive dryer- an adsorption dryer includes first and second drying towers. Each tower has a first port and a second port through which gas can pass into or out of the tower. A first and a second manifold are connected respectively to the first and the second ports of both towers. The manifolds each include integral gas passages, each port of the towers being in communication with a gas passage. Each of the manifolds includes at least one integral valve seat upon which a valve actuator is mounted to constitute a valve to control flow of gas through the gas passages. Adsorption dryers are dual tower dryers. They include two towers of desiccant material (commonly known as beds) one of which is `on stream` drying the gas whilst the other is being regenerated. In a dual tower dryer, the gas to be dried is passed through the desiccant bed of the on-stream tower continuously, in one direction, during a drying cycle. Then, after a predetermined time interval (this interval being chosen such that the bed will have adsorbed sufficient moisture) the inlet gas is switched to the desiccant bed of the other tower and the first desiccant bed is regenerated by some suitable procedure.

Featured Suppliers of Adsorbptive Dryers Adsorbents

Rockford Hi-tech Products(india) Pvt. Ltd.

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Manufacturer of industrial adsorbents...Activated carbon and activated bleaching earth used for product purification.Available in granular and powder form.

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Rocksil,

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Manufacturer of industrial adsorbents...Activated carbon and activated bleaching earth used for product purification.Available in granular and powder form.

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Zeocat Products & Services

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Suppliers of chemicals, adsorbents, catalysts, solvents etc.

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Chemicals, catalysts, adsorbents etc.

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