Microwave regeneration of adsorbent materials for reuse as dryin

Details Microwave regeneration of adsorbent materials for reuse as dryin Microwave regeneration of adsorbent materials for reuse as dryin

1987-11-13

1989-02-21

Warner, Steven E.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

34 80, F26B 334

Patent

active

048053171

ABSTRACT:
Porous desiccant material, such as silica gel, activated alumina, molecular sieves or mixtures thereof, is efficiently regenerated for reuse as a drying agent by irradiating a bed of the desiccant material with microwave energy preferably having a frequency of from 2400 MHz to 2500 MHz or from 900 to 915 MHz to heat and substantially affect only moisture adsorbed by the material and to vaporize the moisture in consequence of the heating of the moisture, the vaporized moisture being purged out of the bed with a forced draft of scavenging air while the bed undergoes irradiation by the microwave energy, and the resulting mixture of scavenging air and vapor being disposed of by discharging the mixture to an effluent receiving region isolated from the bed. As the moisture adsorbed on the pore, capillary and other surfaces of the desiccant material is preferentially heated by energy taken up from the microwave energy, moisture conversion from a liquid phase to a vapor phase is achieved directly, thereby to obviate raising the temperature of the desiccant material itself sufficiently to achieve the phase conversion of the adsorbate indirectly.

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Swenson, "What They are Saying About Microwave Processing, Worldwide," Aoduchon Engineering, Jul. 1987, pp. 44-50.

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