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Room Temperature Gas Scrubber

IP.com Disclosure Number: IPCOM000078243D
Original Publication Date: 1972-Dec-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Marinace, JC: AUTHOR

Abstract

A eutectic alloy of gallium and indium (75.5% Ga and 24.5% In) is used as a room temperature liquid for removing oxygen and water from gases.

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Room Temperature Gas Scrubber

A eutectic alloy of gallium and indium (75.5% Ga and 24.5% In) is used as a room temperature liquid for removing oxygen and water from gases.

The eutectic alloy is heated to approx.100 degrees"C degrees C and an excess of aluminum is added to the alloy, so that upon cooling to room temperature a small amount of aluminum is dissolved in the eutectic alloy. The aluminum in the alloy serves as the gas scrubber. In some applications, the eutectic alloy can serve as a getter, extracting the residual oxygen and water in an evacuated chamber.

Although the amount of Al dissolved in this eutectic is very small at room temperature, apparently it is quite effective as a scrubber. As the Al is used in the formation of Al(2) O(3) , more goes into solution. For very high-flow rates of gas or for larger proportions of O(2) in the gas, larger amounts of eutectic can be used, or it can be heated above room temperature. However, the low solubility of Al in Ga (slightly above room temperature) or in the Ga-In eutectic (at room temperature) is in some respects a safety feature, in that accidental exposures to rich concentrations of O(2) or to water do not result in a violent reaction, despite the high reactivity of the Al.

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