packed bed


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packed bed

[′pakt ′bed]
(chemical engineering)
A fixed layer of small particles or objects arranged in a vessel to promote intimate contact between gases, vapors, liquids, solids, or various combinations thereof; used in catalysis, ion exchange, sand filtration, distillation, absorption, and mixing.
References in periodicals archive ?
The Packed Bed Reactor Experiment studies the behavior of gases and liquids when they flow simultaneously through a column filled with fixed porous media, which is of interest in many chemical and biological processing systems, as well as numerous geophysical applications.
The Xinjiang retort is a packed bed connected with an annular gas intake channel, whereas such structure is widely used in industrial production.
Ozonation process using rotating packed bed is especially effective for concentrated guaiacol degradation and pre-treatment of phenol wastewater [22,49].
An accurate description of fluid flow through packed beds and its mass and heat transfer is important to the design of packed bed reactors.
The CFIC process is a packed bed system and provides the advantage of a much higher dissolved oxygen transport into the biofilm when compared to biofilm systems like trickling filters and moving bed biofilm reactors (MBBR).
MARYLAND (CyHAN)- The purpose of the Packed Bed Reactor Experiment in low gravity is to determine how a mixture of gas and liquid flows through a packed bed in reduced gravity.
However, from an industrial perspective, practical application of biosorption processes should make use of continuous stirred adsorber or packed bed column configurations where large quantities of effluent be treated despite the fact that no sufficient contact time is provided [16-19].
For example in the case of strongly exothermic reactions like selective oxidation of hydrocarbons, packed bed reactors do not allow a good dissipation of the heat.
Therefore the boiler unit is required to provide the low-grade (45 Degrees Celsius) heat to facilitate the evaporative removal of moisture expressed by the Coldry pellets as they pass through the packed bed dryer following extrusion.
More technical articles discuss such topics as the environmental situation and enhanced productivity at a German refinery, increasing capacity and productivity in the metal markets through pneumatic conveying and process injection technologies, applications of thermo-chemical and thermo-physical modeling in the copper converter industries, continuous converting of copper matte in packed bed reactor, operation of air liquid shrouded injector technology, and flash converting.
This can be achieved by either (a) bubbling the air through the liquid, as in a tray column; (b) spraying the liquid in a fine dispersion in an upward airstream, as in a spray tower; (c) spraying the liquid over a bank of cooling tubes past which air is blown; or (d) passing the air and liquid streams through a packed bed.
Gandhidsan (1990) developed a simplified theoretical model for regeneration of a desiccant in a packed bed using solar heated air.