Microwave heating in a vacuum centrifugal concentrator
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United States of America Patent
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May 18, 1993
Grant Date -
N/A
app pub date -
Nov 13, 1990
filing date -
Nov 13, 1990
priority date (Note) -
Expired
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Abstract
A vacuum concentrator uses microwave heating to enhance the rapid drying of a liquid specimen. Microwave heating without excessive arcing is made possible in a vacuum chamber by controlling the power of a microwave generator, by modifying antenna-like objects, and by interposing air in a direct path between opposing edges of microwave injection slots, while maintaining the vacuum condition in the vacuum chamber. This can be accomplished by using air filled plastic bosses passing through, and substantially filling the microwave injection slots. An alternate to the air filled bosses can be a non-metallic closure plate that excludes the microwave injection slots from the vacuum chamber, while allowing energy to be injected freely into the chamber. The microwave heating energy is absorbed by a vacuum chamber cover and dissipated to the atmosphere as heat.
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